This guide walks you through exactly how to adjust uPVC windows step by step, covering horizontal alignment, vertical sash correction, and contact pressure tuning. Learn how to diagnose the specific issue, which tools you need, and crucially, when to stop and call for professional help or when your windows need replacing.

Essential Tools and Preparation for uPVC Window Adjustment

Before you make any adjustments, gathering the right tools and understanding your window hardware will save you time and prevent damage.

• 4mm Allen key – this is the most common size across UK window manufacturers and is needed for adjustable window hinges.
• Phillips head screwdriver – commonly used for hinge adjustments, and top-hung windows need a screwdriver for friction stay adjustments.
• Spanner – this may be required for casement windows for nuts and bolts, depending on the hardware fitted.
• Spirit level – essential for checking window alignment after adjustments
• Soft cloth and mild soapy water – should be used to clean adjustment points before you begin.
• Silicone-based lubricant – friction and stiffness in uPVC windows may be caused by dirt and dry mechanical parts, so applying silicone-based lubricant to moving parts improves operation of uPVC windows and should be part of your preparation.

Important Safety Considerations

Older uPVC windows with cracked or split frames may not hold adjustment screws securely, and forcing hardware into compromised material can cause further damage. If your windows are under warranty, check whether DIY adjustments are permitted, as incorrect modifications could void your coverage. Look for plastic caps on your window hinges; these typically conceal the adjustment screws beneath. Brands like ERA, Mila, and Yale commonly feature documented adjustment ranges. If you remove these caps and find no adjustment screws, your hardware is likely non-adjustable, and you’ll need professional assistance or replacement hinges.

Step-by-Step uPVC Window Adjustment Methods

There are three principal types of adjustment you can make to uPVC windows: horizontal (side-to-side), vertical (up/down), and compression (how tightly the sash presses against the frame seal). Common symptoms of uPVC window issues include catching on the frame and difficulty locking. Incorrect alignment causes uPVC windows to stick when opening, while gaps between the window and frame can lead to draughts. Adjusting uPVC windows can fix draughts and ensure smooth opening and closing, improving both energy efficiency and security.

To identify which adjustment you need, close the window completely and run a thin strip of paper around the edge where the sash meets the frame. Consistent resistance indicates a good seal; any loose spots reveal where the problem lies. You can also try the candle test, which can help identify draught spots-hold a lit candle near the window edges on a windy day and watch for flickering. Use a spirit level to check whether the sash is sitting level, and open and close the window several times to observe exactly where rubbing or sticking occurs.

Horizontal Adjustment for Sticking and Misaligned Windows

When your window sash is rubbing against one side of the window frame, horizontal adjustment is needed. Open the window completely to access the hinge adjusters. On side-hung casement windows, locate the adjustment screws on the hinge leaf where the sash meets the frame. Use a 4mm Allen key for hinge adjustments.

If the sash is catching at the top on the lock side, adjust the top hinge first. The adjustment screw for the hinge can be turned clockwise or counter-clockwise. Turning the hinge clockwise typically pulls the sash towards the hinge side, while turning anti-clockwise pushes it towards the other side. Make small adjustments of roughly a quarter turn at a time, then close the window to test whether it moves in the right direction. If the bottom edge is rubbing, repeat the process on the bottom hinge. The typical horizontal adjustment range is ±3–4 mm, so if your misalignment exceeds this, further adjustments won’t help and the hinges may need replacing.

Vertical Adjustment for Dropped Window Sashes

A dropped sash is a common problem with uPVC windows, particularly on larger or heavier units. Dropped sashes can open gaps between the frame and sash, allowing cold air in and causing heat loss. Adjusting hinges can resolve dropped or misaligned sashes in uPVC windows.

For side-hung windows, locate the vertical adjustment screw, usually hidden under a plastic cap on the hinge. Using your Allen key, turn the screw clockwise to raise the sash or anti-clockwise to lower it. The typical vertical adjustment range is around ±2–3 mm. Ensure you adjust both the top and bottom hinge position equally to keep the sash properly aligned across its full height.

Adjust top-hung windows by tightening screws under the friction stay. If the friction stay has lost tension and the window won’t stay open at the desired angle, locate the tension screw on the stay arm and tighten it. After each adjustment, close the window and check that the gap spacing between sash and frame is even all the way around. Loosen screws to reposition the window for better alignment if needed, then retighten once the sash sits correctly.

Lock Mechanism and Contact Pressure Adjustment

When the window lock is stiff or engages poorly, the locking mechanism and contact pressure likely need attention. If uPVC windows are not sealing properly, adjustments can often improve the situation. Most modern uPVC windows have mushroom cams for adjusting compression and seal pressure-these are the oval or mushroom-shaped rotating components on the edge of the sash that engage with strike plates on the frame.

Adjustments to the locking cam pressure should be made in small increments. Turn the cams to increase or decrease how tightly the sash compresses against the rubber seals. Adjusting the locking cams can increase winter weather tightness in uPVC windows, helping to stop draughts and create a tighter seal. The compression adjustment range is typically ±0.5 mm to ±1.5 mm. The handle of a properly adjusted uPVC window should engage with firm resistance-not so tight that you struggle to turn it, but firm enough to create a better seal against the frame. Small adjustments to uPVC windows should be tested frequently for effectiveness; close and lock the window after each quarter turn to check the result.

If the lock still won’t catch after hinge and cam adjustments, you may need to adjust window locks by repositioning the strike plate. Loosen its fixing screws, shift the plate slightly, and retighten. Misaligned hinges can cause gaps and draughts in windows, so always verify hinge alignment before assuming the lock itself is at fault. Damaged rubber seals reduce a window’s ability to form a tight seal, and no amount of compression adjustment will compensate for perished or flattened seals and will therefore need replacing.

Professional Help vs DIY Solutions

While minor adjustments to uPVC windows are well within the capabilities of most homeowners, there are clear limits to what DIY can achieve. If adjustments do not fix issues, worn hinges or seals may need replacement, which may require professional tools and expertise. Understanding when to call in help can save you money and prevent further damage.

Signs You Need Professional Window Repair

Contact a professional if you notice severely corroded or broken friction hinges, hinge pins that have sheared, or if the misalignment exceeds the ±3–4 mm adjustment range of standard hardware. Draughts can occur due to misalignment over time, but if you’ve worked through all the adjustment points and the window still won’t close smoothly or seal properly, the issue likely goes beyond what adjustment screws can resolve. Older windows, particularly those fitted before the mid-1990s, may have fixed butt hinges with no adjustment capability at all.

Signs You Need Complete Window Replacement

Some problems are beyond repair. Failed double glazing, visible as condensation or fogging between panes, cannot be resolved through alignment adjustments. Extensively warped or cracked window frames, obsolete hardware that’s no longer manufactured, and damaged rubber seals that have perished beyond replacement all point towards fitting new uPVC windows.

New A-rated energy-efficient windows offer significantly improved insulation, better security features, and lower maintenance requirements. Window replacements in England and Wales must comply with building regulations and should be carried out by FENSA-registered installers to ensure proper certification and compliance.

Conclusion

Most uPVC window problems – sticking sashes, draughts, and locks that won’t engage – can be resolved with a 4mm Allen key, a screwdriver, and 15 to 30 minutes of careful adjustment per window. Horizontal, vertical, and compression adjustments each address specific symptoms, and working through them methodically will restore your window’s ability to close properly and maintain a tight seal. Regular maintenance, ideally checked before winter and after periods of heavy weather, keeps everything functioning properly and prevents minor issues from becoming costly repairs.

The key is knowing your limits. If the frame is damaged, rubber seals are perished, or adjustments aren’t bringing the sash back into proper alignment, professional help offers better value than repeated DIY attempts. Whether you’re tackling the adjustment yourself or deciding it’s time for replacement, understanding how your uPVC windows work puts you in control of the decision.

Assess your windows today-check each one for draughts, sticking, and uneven gaps. For straightforward misalignment, the steps above will get your windows properly aligned and sealed. For anything more complex, get quotes from qualified window professionals who can advise whether repair or replacement is the smarter investment.

FAQ

The post How to Adjust uPVC Windows: A Complete Step-by-Step Guide appeared first on Cosyhomes Windows.

What are uPVC Windows?

uPVC stands for unplasticised polyvinyl chloride, a rigid plastic that has been the dominant window frame material in UK homes since the 1980s. Unlike timber windows, which require regular painting and can rot, uPVC window frames are weather-resistant, moisture-proof and require little maintenance beyond cleaning every few months with warm soapy water. High-quality uPVC can resist fading and warping, making it a reliable long-term choice.

The strength of modern uPVC frames comes from their multi-chambered design. Internal cavities act as an insulating barrier, trapping air to reduce heat loss, while profiles are reinforced internally with galvanised steel for structural rigidity. This construction delivers excellent thermal efficiency without additional engineering, which is one reason uPVC remains so cost-effective.

uPVC windows typically last 20 to 30 years with proper care, and in favourable conditions, some installations reach 35 years. They’re the most economical option for initial costs, and energy ratings of A+ or A++ are now standard with quality double glazing. Modern flush sash uPVC windows are popular for a cleaner look, and colour options have expanded to include woodgrain effects and foiled finishes. uPVC windows come in a variety of colours and woodgrain effects, though prolonged exposure to direct sunlight can cause some discolouration over time. At Cosyhomes Windows, every uPVC installation comes with our 10-year guarantee and is fitted by our experienced local team.

What are Aluminium Windows?

Aluminium window frames are made from extruded aluminium alloy, a lightweight yet incredibly strong material that allows for slim, sleek frames and larger windows. Modern aluminium windows include thermal breaks to improve efficiency: a polyamide insulating strip is built into the frame to interrupt heat conduction, solving the traditional weakness of metal frames. Frames are then powder-coated for a durable, UV-stable finish, and many systems carry colour warranties of 20 to 25 years.

The strength of aluminium frames is a genuine advantage. Aluminium frames are typically 45 to 55 mm wide, compared to 60–80mm for uPVC equivalents. This means aluminium windows maximise glass area for more natural light – up to 12–15% more glass in the same opening. Aluminium frames provide a modern aesthetic suitable for contemporary designs, picture windows, sliding doors and bifold configurations where slim sightlines matter most.

Aluminium windows can last 40 to 50 years with minimal upkeep, and they are more resistant to warping and UV damage than uPVC windows. Aluminium windows require minimal maintenance and resist corrosion, particularly when specified with marine-grade powder coating for coastal locations. Cosyhomes Windows has extensive experience installing aluminium-framed windows across Surrey, ensuring proper installation and long-lasting performance.

Cost Comparison: uPVC vs Aluminium Windows

uPVC is generally more affordable compared to aluminium. Aluminium windows can cost 45% to over 100% more than uPVC, depending on the system quality, finish, glazing specification, window style and installation requirements.

The cost difference stems from materials, manufacturing complexity and installation precision. Aluminium extrusions require thermal break technology and powder coating, while dual-colour finishes, premium hardware and specialist glazing can increase prices further. However, aluminium’s longer lifespan can reduce overall replacement costs when you spread the investment over 40–50 years rather than 20–30 years, meaning the annual cost gap can narrow considerably.

To keep costs down, consider standard window sizes, standard finishes and grouping your installation into a single project. At Cosyhomes Windows, we offer competitive pricing, free consultations and can provide a tailored quote based on your home, preferred style and specification. We can also discuss finance options to help spread the cost of your investment.

Durability and Lifespan Comparison

uPVC windows generally last 20 to 30 years, while aluminium windows typically last 40 to 50 years. That’s a significant difference in long-term value. uPVC can become discoloured and brittle over time, particularly on south-facing elevations exposed to strong UV. Aluminium, by contrast, retains its shape, colour and structural integrity for decades. Aluminium windows require minimal maintenance and resist corrosion, even in harsh weather conditions.

Over time, uPVC frames may yellow slightly, and coloured foils can fade; seals and gaskets may need replacing before the frame itself. Aluminium’s powder-coated finish resists peeling and flaking, and quality systems withstand harsh weather conditions, including salt-laden coastal air when marine-grade powder coating is specified.

Warranty coverage reflects this durability gap. Aluminium frames often carry colour warranties of 20–25 years, while uPVC systems typically offer 10-year guarantees. Cosyhomes Windows backs all installations with a 10-year insurance-backed guarantee covering workmanship and materials, giving you peace of mind regardless of which frame material you choose.

Energy Efficiency and Thermal Performance

uPVC offers superior natural insulation due to its material properties. The multi-chambered design creates pockets of trapped air that limit heat transfer, and uPVC windows achieve U-values as low as 0.8 W/m²K with triple glazing – outstanding for heat retention. With standard double glazing, whole-window U-values typically sit between 1.2 and 1.4 W/m²K.

Modern aluminium frames can match or exceed the energy efficiency of uPVC thanks to thermal break technology. Aluminium windows typically have U-values around 1.2 to 1.4 W/m²K in well-specified systems. Without thermal breaks, aluminium conducts heat rapidly, but today’s high-performance glazing systems with polyamide breaks, quality seals and low-E coated glass panes close the gap substantially.

Both window types can significantly reduce heating bills compared to older windows. Triple glazing improves sound insulation and thermal performance further for either material. Building Regulations (Part L) set minimum U-value requirements, and both uPVC and aluminium windows comply when properly specified. Choosing energy-efficient windows directly lowers energy costs and energy bills season after season.

Maintenance and Care Requirements

Both uPVC and aluminium windows are low-maintenance options, which is a major reason they’ve replaced timber windows across the UK. uPVC windows require cleaning every few months with soapy water to keep frames looking fresh. Handles, hinges and locking mechanisms may need occasional oiling, and drainage channels should be kept clear. Minimal maintenance keeps uPVC performing well throughout its lifespan.

Aluminium windows need minimal maintenance and resist corrosion. Cleaning powder-coated frames with warm soapy water removes dirt and, in coastal areas, salt deposits. Hardware should be checked periodically, and seals inspected, but overall aluminium demands very little ongoing attention. The powder-coated surface won’t peel or flake under normal conditions, maintaining that modern aesthetic for decades.

Long-term, uPVC may require hardware replacement or glass unit renewal (if seals fail and misting occurs), while aluminium’s main consideration is finish care. Both benefit enormously from proper installation – a well-fitted window of either material outperforms a poorly installed premium product. Cosyhomes Windows provides aftercare advice and support to help you get the most from your chosen windows.

Aesthetics and Design Flexibility

This is where uPVC and aluminium windows differ most visibly. uPVC frames are often thicker than aluminium frames due to material strength requirements, typically 60–80mm wide. Aluminium’s strength allows sleek frames as narrow as 45–55mm, letting in more light and giving a cleaner, more contemporary appearance. Aluminium offers a broader palette of colours compared to uPVC, including any RAL colour, dual-colour options, and textured or metallic finishes.

For traditional properties, uPVC suits sash windows, flush sash windows and casement windows with period detailing. Aluminium suits modern properties, extensions, picture windows and configurations where maximising natural light and glass area is the priority. Aluminium windows offer a sleek, modern aesthetic with slimmer frames, making them the natural choice for larger windows and architectural statements.

At Cosyhomes Windows, we offer a full range of styles and customisation options in both materials, helping you find the right windows for your home’s character and your personal taste.

Which Window Frame Material Should You Choose?

Choose uPVC if your priority is keeping costs down, you want a proven, cost-effective window material, or you’re replacing windows across a larger property where budget matters. uPVC suits traditional home styles, delivers good thermal insulation, and performs reliably for 20–30 years.

Choose aluminium if you value longevity, maximum natural light, slim sightlines and a modern aesthetic. Aluminium is the strongest possible frame material for residential windows, and aluminium’s rigidity provides extra resistance against physical attacks – aluminium windows are harder to force open than uPVC. Both uPVC and aluminium windows can have multi-point locking systems, and both window types exceed required security standards with proper locks, but aluminium edges ahead on physical security.

Consider your location, too. Coastal properties benefit from aluminium with marine grade powder coating. For noise reduction, the glazing specification matters more than frame material – both work well with acoustic laminated glass. If you plan to stay in your home long-term, aluminium’s 40–50 year lifespan delivers exceptional value. For shorter ownership horizons, uPVC’s lower upfront cost makes strong financial sense.

The most important factor? Quality installation. Contact Cosyhomes Windows for a free, no-obligation consultation. Our team will assess your property, discuss your priorities and recommend the right solution – whether that’s aluminium, uPVC, or a combination of both.

Conclusion

Comparing upvc vs aluminium windows comes down to balancing cost, longevity, thermal performance and design. uPVC windows are affordable, energy efficient and well-suited to most UK homes. Aluminium windows last longer, offer slimmer profiles with more light, and deliver a premium finish that holds up for decades. Both materials are durable, low maintenance and capable of meeting current Building Regulations.

The right choice depends on your budget, your property and how long you want your windows to last. What matters equally is the quality of installation and the company behind it. As a family-run business based in Chessington, Cosyhomes Windows brings hands-on expertise in both aluminium and uPVC windows, with a same-day completion policy where possible and a 10-year insurance-backed guarantee on every project.

Ready to find the right windows for your home? Get in touch with Cosyhomes Windows for a free quote and personalised advice from our experienced team.

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Views and Natural Light

Both door types bring light into your home, but the way they do it differs:

Sliding doors

Sliding doors tend to provide panoramic views with large glass panes and slim sightlines, ideal for small openings or spaces where less frame is preferred.

Bifold Doors

Bi-fold doors fold away completely, offering unobstructed access and a seamless transition to the garden or patio, perfect for wide openings or entire walls of glass.

The amount of natural light depends on the glazed area, not just the mechanism. Both door options can create bright, open spaces filled with fresh air and natural light.

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In this article, we’re going to look at how to fix window locking mechanism easily and give you peace of mind this holiday season, so you leave no window open but all are locked shut to secure your home.

Identifying the Type of Window Lock

If one of your windows has a broken mechanism, there’s no need to immediately think that you need to replace the entire window. Firstly, identify what type of window lock your window has. Below are some popular designs:

Sash locks

A sash window lock stops the window from being opened from the outside. Unlike some other windows, a sash lock doesn’t act as a handle latch and you need to slide the lock up to open the window.

Casement locks

To identify a casement lock on a window, look for a window handle or lever mechanism typically located along the window’s vertical or horizontal edge, allowing you to open your window and close and lock it securely in a swinging motion.

Sliding window locks

To identify a sliding window lock, check for a latch or lever usually positioned on the horizontal track of the window frame, enabling it to be locked shut by locking the sliding panel.

Gathering Necessary Tools and Materials

Once you have identified your UPVC window lock, you can gather the tools you need to make your repair.

The tools you need include:

• Screwdriver – For removing screws from the existing lock.
• A replacement window lock – Make sure that you ensure it matches the size and type of your existing one.
• Tape measure – To measure dimensions for proper alignment and position.
• A pencil or pen – For marking positions and aligning the new lock accurately.

Depending on the specific type of window lock and installation requirements, you might also need:

• A drill – If new holes need to be drilled for the installation.
• Drill bits – Matching the size required for the screws or bolts.

Step-by-Step Repair Instructions

1. Start by gathering the tools required, including your screwdriver, tape measure, pencil, and the replacement window lock.
2. Remove your old lock – Unscrew and remove the existing window lock with the screwdriver.
3. Measure and align – Use the measuring tape to determine the proper placement for the new lock. Mark the position with a pencil.
4. Prepare your new lock – Ensure the replacement window lock matches the size and type of the old one.
5. Drill holes (if needed) – If the new lock requires different screw placements, use a drill and appropriate drill bits to create holes in the marked positions.
6. Install your new lock – Attach the replacement lock using the provided screws or bolts. Tighten securely with the screwdriver to make sure it is attached.
7. Test – Test the opening mechanism and confirm that the new window lock functions correctly. A jammed or stuck window is sign that there is a problem with the repair.
8. Adjust if needed – If the lock feels too tight or loose, make any necessary adjustments according to the lock’s instructions.
9. Contact a professional, if there are repair issues. Cosyhomes Windows offer the best service in Surrey and are highly experienced in repairs for a window mechanism that needs fixing.

We hope that you found this article useful in helping you to identify and replace double glazed windows’ locks.

If you need expert advice, we can help. We are highly experienced UPVC window professionals and can replace and repair windows that have broken locks, are jammed shut, or are stuck in an open position.

Give us a call now on 0208 397 4040 or contact us via our online form and one of our team will get back to you shortly. And remember, keep your home secure this Christmas.

The post How To Fix A Broken Window Lock Easily appeared first on Cosyhomes Windows.

The good news: fixing and insulating draughty windows is one of the most cost-effective improvements you can make for home comfort. To stop draughts from windows, start by checking seals and gaskets for visible damage, apply draught-proofing strips or insulating window film for quick relief, and call a specialist like Cosyhomes Windows for professional repairs if the problem persists. Many draughty windows can be repaired rather than replaced, and sealing windows properly can save approximately £85 annually in energy costs.

In this article, we cover a range of solutions, including:

• Quick DIY fixes – foam tape, silicone sealant, window insulation film, thermal curtains, draft snake
• Semi-permanent upgrades – EPDM and brush strips, secondary glazing kit, hardware adjustments, trickle vents
• Professional repairs – seal renewal, hardware realignment, frame resealing, misted unit replacement
• Secondary glazing – for single-glazed and heritage windows
• Full window replacement – when repair is no longer viable

Spotting Draughty Windows: Signs, Tests, and Red Flags

Before choosing how to fix drafty windows, you need to pinpoint exactly where the air leaks are. A gap along the meeting rail of a sash window needs a completely different fix from a failed seal between the frame and the wall. Misidentifying the source often leads to wasted effort and money.

Practical at-home tests:

• Run the back of your hand slowly around the window on a windy day, and you’ll feel cold air where there are gaps
• Detect draughts using a candle or incense stick; hold it near the edges and watch for flame flicker or smoke drift
• If you have net curtains, check them with the window closed. If they move, air is getting through
• Listen for whistling or rattling during strong winds

Common symptoms of draughty windows:

• Cold spots on walls beside window panes or on the glass itself, even with heating on
• Visible gaps around window frames clearly indicate air leaks
• Rooms that never reach a comfortable temperature despite the heating system running
• Rising energy bills compared to previous winters
• Damp patches or mould forming on window reveals are a sign that cold surfaces are triggering condensation

Small air leaks vs major gaps:

• A tiny gap (under 2–3 mm) at the meeting rail or around a worn gasket may only produce a slight breeze. This can be detectable with a candle but easy to miss by hand
• A warped frame, missing seal section, or separation between the frame and the wall allows large, obvious airflow and significant heat loss
• Rattling sashes usually indicate the window can’t close properly or locking hardware has failed

Regular inspections of seals and caulk can help maintain window energy efficiency over time. If your DIY checks reveal persistent problems, take photos and notes of the affected areas to share with a professional.

Common Causes of Draughty Windows

Windows naturally degrade over 10–25 years. Materials shrink, seals erode, frames warp, and hardware loosens. Even relatively modern windows suffer if the original installation was poor or the materials were substandard.

Seals and gaskets:

• Rubber seals and EPDM gaskets crack or shrink due to UV exposure and temperature cycling. Older windows can lose effectiveness due to worn seals alone.
• Foam gaskets compress over time, losing their ability to rebound and fill the gap around the opening sash.

Frames ageing or warping:

• Timber window frames absorb moisture, dry out, and shrink at joints. Sagging sills create bottom gaps.
• Older uPVC and aluminium frames can warp, settle, or lose their existing window frames’ original shape, preventing a tight seal.

Perimeter sealant failure:

• The mastic between the external frame and brickwork can crack and separate, especially on properties built or refurbished in the 1980s–2000s. Small cracks here let both wind and water penetrate.

Hardware problems:

• Hinges, espagnolette locks, keeps, and handles that no longer align prevent the sash from compressing evenly against seals. Faulty seals are often actually faulty hardware.

Glass type:

• Single pane windows and original box sash windows with single-glazed window glass offer very little insulation (U-values around 5.5 W/m²K), even when frames are sound.

Poor installation:

• Poorly installed windows with twisted frames, uneven packers, or missing sealant are a frequent cause of draughts in builds from any era.

DIY Temporary Fixes: Fast Ways to Calm a Draught

These temporary solutions are ideal for renters, for bridging the gap before professional repair, or when you need to stop window drafts quickly during a cold snap.

• Self-adhesive draught excluder/foam tape: Stick foam or rubber-foam strips around the sash and frame perimeter. Make sure to match the strip thickness to the gap. If it is too thick the window won’t close properly, too thin, it’s ineffective. Self-adhesive foam strips last 1–3 years before needing replacement. Cost: roughly £2–£10 per window. Weatherstripping should fit snugly to prevent air from entering around window sashes.
• Silicone sealant or caulk: Applying silicone sealant can fill cracks and gaps around window frames, particularly where the frame meets masonry. Caulking can seal gaps between the frame and surrounding wall to prevent drafts. Use exterior-grade silicone and avoid covering drainage weep holes, as those prevent water build-up inside the frame.
• Insulating window film: Clear heat-shrink plastic film can serve as a temporary secondary-glazing barrier over single-glazed or very cold windows. Insulating window film can reduce heat loss by up to 30%. Cost: around £5–£20 per window. It can limit your ability to open the window and affects the view slightly.
• Heavy or thermal curtains: Hanging heavy thermal curtains can create a barrier against cold drafts. Floor-length curtains with a pelmet trap an extra layer of still air. Heavy thermal curtains can significantly reduce heat loss at low cost with no structural changes.
• Draft snake/draught stopper: A fabric tube placed along the bottom rail of an existing window or sill blocks cold air seeping under timber sashes. Cheap, easy to make or buy, but needs repositioning each time the window opens.

These are temporary fixes and not permanent solutions. Most reduce your ability to open the entire window freely.

Smarter Draught Proofing: Semi-Permanent Improvements You Can DIY

For homeowners willing to invest a couple of hours per window, these draught proofing measures offer a more permanent fix with better durability than basic tape and plastic film.

• Upgrade to EPDM, silicone bulb, or rubber seals: Replace cheap foam with P-, E-, or V-profile compression seals. These resist UV and temperature swings and last significantly longer. Silicone sealant can last 5–10 years when properly applied. Cost: £10–£20 per window in materials.
• Brush strips for sash windows: Fit brush pile weatherstripping along meeting rails, parting beads, and sliding edges. Brush strips can last 3–5 years and allow window movement without obstruction, which is essential for any opening sash.
• Controllable trickle vents: Rather than sealing off existing vents permanently, upgrade to adjustable models that let you control airflow. This helps manage moisture while keeping outside temperatures at bay.
• Replace perished gaskets and adjust hardware: Many uPVC and aluminium systems use standardised gasket profiles available by the metre. Reseat keeps and tighten locking points so the sash pulls firmly into the rubber seals when locked – this alone can fix faulty seals without replacing parts.
• Low-cost secondary glazing kit: Acrylic panel or magnetic strip systems clip inside the existing window reveal, creating an air gap of 50–100 mm. Interior storm window inserts improve insulation without blocking views. These lean towards a more permanent solution and require careful measurement of the existing window frames.

Addressing air leaks with these methods can reduce heat loss without full window replacement.

Professional Repairs: When to Call Cosyhomes Windows

Many draught issues that seem serious can actually be resolved through targeted professional repair rather than replacing the entire window. This is central to how Cosyhomes Windows approaches every job – repair first, replace only when necessary.

When to call a professional:

• Thick black mould or rotting timber around the window frame or sill
• Windows that won’t close properly due to frame distortion or broken locks
• Condensation trapped between double glazing panes is a clear sign of a failed seal in the sealed unit
• Visible frame movement or separation between the frame and the wall
• Underlying issues that keep returning after repeated DIY attempts

What Cosyhomes Windows can do:

• Replace misted or failed double-glazed units without changing the frame
• Renew rubber seals, EPDM gaskets, and brush pile around sashes and frames
• Re-align hinges, fit new handles, and adjust espagnolette locking points for correct compression
• Reseal frame-to-wall joints with colour-matched mastic for a clean finish
• Carry out a full draught assessment, checking frame distortion, seal compression, and pinpointing the precise source of air leaks rather than guessing

Professional air sealing can reduce energy waste by up to 45%, and professional draught-proofing provides a permanent seal for windows that DIY solutions simply can’t match. Repair can often be completed in a single visit for typical problems like faulty handles, misaligned hinges, or misted units. Visit the Cosyhomes Windows repairs page to find out more about professional solutions.

Secondary Glazing and Upgrades for Single Glazed Windows

Older single-glazed windows and original sash windows are particularly prone to draughts and poor energy performance. With U-values often around 5.5 W/m²K, even perfectly maintained single pane windows let far more heat escape than modern double glazing.

• What secondary glazing does: It adds a discreet inner layer of window glass or an acrylic panel on the room side, trapping an insulating air gap between panes. Secondary glazing can reduce heat loss by up to 60%.
• Temporary vs robust systems: Window insulation film using double-sided tape and plastic film is the cheapest option. More durable solutions include aluminium-framed sliding panels or magnetic strip systems that can be removed seasonally.
• Heritage suitability: Secondary glazing is often permitted in conservation areas and listed buildings where replacing the external window frame is not allowed, provided the system is reversible and non-destructive.
• Combined approach: Pairing secondary glazing with draught proofing on the original sash delivers much more complete performance, tackling both small gaps and overall thermal resistance.
• Cost perspective: Professional secondary glazing runs roughly £160–£700 per window depending on size and style, while DIY acrylic panels cost £50–£150. Cosyhomes Windows can advise whether secondary glazing or replacement windows represent the best route for your property type and budget.

When a Permanent Fix Means New Windows

While many draughty windows respond well to repair, some reach a point where a full window replacement is the only sensible long-term solution. Windows over 20–25 years old often need professional replacement, especially when frames are severely warped, timber is rotten beyond repair, or seals have failed repeatedly after multiple fixes.

Modern windows offer transformative improvements:

• A-rated double glazing or triple glazing with warm-edge spacers and low-e coatings
• Multi-chambered uPVC or thermally broken aluminium window frames that virtually eliminate cold bridging
• Flush sash, casement, or tilt-and-turn designs with multipoint locking for an airtight seal
• High-quality gaskets and adjustable hinges that maintain a tight seal for decades

Replacement windows are more expensive – typically £500–£1,500 each – but the energy savings, comfort gains, and improved home’s energy efficiency are substantial. Professional insulation can significantly improve energy efficiency across the whole property, and homeowners recover up to 84% of insulation upgrade costs at resale. Cosyhomes Windows will always survey your old windows and recommend repair versus replacement based on what’s genuinely most cost-effective.

Balancing Draught Proofing, Ventilation, and Condensation

Completely sealing windows isn’t the goal. You need to stop uncontrolled draughts while maintaining enough ventilation for healthy indoor air quality.

• Aggressive sealing of every gap can increase condensation on cold window glass if moisture from cooking, bathing, and breathing has nowhere to go – leading to mould, peeling paint, and timber rot.
• Never permanently block trickle vents or air bricks. Use them alongside draught proofing to maintain controlled background airflow.
• Use extractor fans in kitchens and bathrooms, open windows briefly after showers, and keep furniture clear of cold external walls.
• Cosyhomes Windows engineers consider both draught proofing and ventilation when recommending repairs, ensuring you don’t simply swap a draught problem for a damp problem.

The best permanent fix blends a tight seal around window frames with planned, controllable ventilation – energy-efficient comfort without the condensation risk.

Next Steps: Getting Your Draughty Windows Sorted

Draught proofing windows delivers noticeable comfort and measurable energy savings without always requiring new windows.

Your action plan:

• Inspect your windows for obvious issues – run the hand and candle tests, check for visible damage to seals, and note any small gaps or frame movement
• Apply safe temporary fixes – foam tape, insulating film, or thermal curtains for immediate relief this winter
• Book a professional assessment if draughts persist, if you spot mould, or if your windows are over 20 years old

Contact Cosyhomes Windows for tailored advice on repairs, secondary glazing, or replacement windows. You can request a survey or send photos of your draughty windows to get started.

With the right combination of DIY solutions, professional draught proofing, and – where genuinely needed – new windows, a warmer, more energy-efficient home is achievable for most properties. Save money, cut your energy costs, and cure drafty windows.

The post Drafty Windows: Causes and How to Prevent Them appeared first on Cosyhomes Windows.

In this article, we’re going to look at the process of how to fill window frame cracks including the tools and materials you will need, as well as advice on filling the cracks.

Tools and Materials You’ll Need

Some tools and materials that you’ll need to repair cracks around the window frame are:

• Caulk Gun: This is for applying caulk smoothly and evenly.
• Utility Knife: To cut the caulk tube tip and remove old caulk.
• Putty Knife: This is for scraping away old caulk and smoothing new caulk.
• Cleaning Supplies: Such as cloths and soapy water to clean the area before sealing.
• Masking Tape: Mask off areas and ensure clean caulk lines are used.

You may also need a backer rod to fill larger gaps or voids before applying caulk to ensure a more effective seal.

There are different types of caulking that you can use on a window frame when repairing:

• Silicone: Best for non-porous surfaces like glass and metal, offering excellent flexibility and water resistance.
• Acrylic Latex: Ideal for painted surfaces and easy to clean up with water, though less flexible than silicone.

• Backer Rod: Ensure a proper seal is used to fill larger gaps before caulking.
• Expanding Foam: Useful for sealing and insulating larger cracks and gaps.

Having these tools and materials on hand will help you seal cracks around your window frames effectively, enhancing your home’s efficiency and comfort.

Preparing the Work Area

To remove old caulk and debris from the crack:

• Use a Utility Knife: Carefully cut along the old caulk to remove it from the crack.
• Scrape Debris: Use the utility knife or a putty knife to scrape away any remaining old caulk and debris.
• Clean with a Damp Cloth: Wipe the area clean with a damp cloth to remove dust, dirt, and residue. This ensures better adhesion for the new caulk.

Proper preparation is important for a successful repair as it ensures that the new caulk adheres well and forms a tight seal. Removing old caulk and debris allows the new caulk to bond properly with the surface, preventing air and moisture infiltration. A clean surface also results in a neater finish and prolongs the lifespan of the repair, contributing to the overall efficiency and longevity of your windows.

Filling the Cracks

For Small Cracks (using caulk):

To load the caulk gun, insert the tube and push the plunger forward. Cut the nozzle at a 45-degree angle, then squeeze the trigger while moving steadily along the crack. Finally, use a wet finger to smooth the caulk for a professional finish.

For Larger Gaps (using backer rod and caulk):

The backer rod prevents overfilling with caulk by controlling the depth of the sealant. To use it, press it into the gap, ensuring it’s slightly below the surface. Then, apply caulk on top, following the same method as before, for a smooth seal.

Conclusion

Properly sealing cracks around window frames offers your house numerous benefits, including improved energy efficiency, enhanced comfort, and protection against moisture damage. If you feel that the cracking is a larger problem rather than a cosmetic issue, or there may be structural issues, contact Cosyhomes Windows for expert servicing and repairs. We can ensure your windows are properly sealed for optimal performance and longevity. Contact us here.

The post How To Fill Cracks Around Window Frames appeared first on Cosyhomes Windows.

Conclusion

When considering composite doors vs uPVC, both have their strengths. uPVC doors are a popular, cost-effective choice for front doors that offer good insulation and require very little upkeep. However, if you’re looking for doors better than uPVC in terms of strength, design, and overall performance, composite doors are hard to beat.

With their solid construction, security composite doors offer added peace of mind, making them ideal for homeowners who prioritise safety. They’re also built to last, with excellent resistance to weather and wear, all while maintaining their appearance with minimal maintenance.

From an energy efficiency perspective, both perform well, but composite doors usually perform better in harsher climates. While there is a price difference between uPVC, which is significantly lower priced, and composite doors, many find the extra cost is worth it for the added durability, security and style.

Ultimately, your choice will depend on your budget, your home’s style and what you value most in a door frame. Whether that is cost, style, or long-term performance. If you’re interested in exploring high-quality door options, including both uPVC and composite, you can find more details and advice on our website.

By considering all the features of composite doors and uPVC, you’ll be able to find the right fit for your home.

The post uPVC vs. Composite Doors: Pros, Cons & Considerations appeared first on Cosyhomes Windows.

Key Takeaways

• Understand what composite doors are and why they’re a durable, low-maintenance choice for your home.
• Learn how to prepare properly before cleaning to protect both the door and surrounding areas.
• Discover step-by-step cleaning methods to keep your composite door looking fresh and new.

Understanding Composite Doors

Composite doors are a popular choice for homeowners due to their style, low maintenance, and durability. A modern composite door is hard-wearing, with reinforced steel running the length of the door frame. Composite door maintenance can be done in just a few minutes as part of a regular cleaning schedule. All you need is warm, soapy water and a soft cloth.

Preparation for Cleaning

To prepare your door for cleaning, remove any loose dirt and, with a soft-bristled brush, wipe away any dust. Using a fresh bucket and clean water, mix in a mild soap to clean your composite door. Do not use washing up liquid There’s no need to use a specialist composite door cleaner or abrasive cleaners.

Cleaning the Door

With the door open, use a soft sponge or microfiber cloth to remove build-up, working from the top of the door downwards. For stubborn dirt or stains, a specialised PVC-U cleaner may be needed, but read the cleaner’s guidelines carefully before using. Clean around the frame, panels, door knocker, and other composite door furniture, which can accumulate dirt, focusing on any stubborn stains. Use a dry, clean cloth to wipe away any soap residue and prevent water spots.

Cleaning the Glass

To clean the glass, apply a special glass cleaner to a soft cloth and gently wipe the panels in your composite door. Finish by using a dry cloth to remove excess glass cleaner and prevent any streaks.

Avoiding Damage

To remove dirt and restore colour, there’s no need to use composite products or harsh products, which could damage the door’s finish, or a pressure washer. To clean a composite door, you just need warm soapy water, a soft cloth, and elbow grease. Avoid using washing-up liquid or a scrubbing brush, as this can damage the door. Cleaning your composite door regularly will increase its life expectancy and structural integrity

Conclusion

Regular cleaning and maintenance of your composite door not only enhances its appearance but also extends its lifespan, helping it look great and function smoothly for years to come. Fortunately, keeping your door in top condition is both quick and easy — all it takes is warm, soapy water, a soft cloth, and a few minutes of your time. There’s no need for harsh chemicals, abrasive tools, or specialist cleaners. Avoiding these can help preserve the door’s protective finish and prevent unnecessary wear or damage.

By following a simple cleaning routine and occasionally lubricating the moving parts, you can maintain the beauty and integrity of your composite door with minimal effort. Whether you’re cleaning the glass panels, wiping down the frame, or removing dirt from the hardware, the process is straightforward and effective. Composite doors are a smart, low-maintenance investment for homeowners, and with just a little care, they’ll continue to add curb appeal and security to your home for many years to come.

For expert advice and to find out more about the options available for your home, contact Cosyhomes Windows.

The post How to Clean Composite Doors: Keeping Them Looking New appeared first on Cosyhomes Windows.