Resealing windows is a straightforward process that stops draughts and prevents up to 30% of heat loss in UK homes. Properly sealed windows create a warmer living space while significantly reducing your energy bills.
Key Takeaways
- Resealing windows is one of the most effective ways to stop draughts, preventing up to 30% of heat loss in UK homes.
- Identifying window seal failure is simple: look for visible gaps, conduct a candle test near frames, or check for condensation between double glazing.
- While DIY resealing is achievable with basic tools, professional services often provide more thorough results and long-lasting protection against draughts.
Why Resealing Windows Matters for UK Homes
In the UK’s damp and chilly climate, proper window sealing is an essential part of home maintenance.
The Energy Saving Trust estimates that proper draught-proofing of windows and doors can save around £40 annually on heating bills for a typical UK home.
With UK energy prices soaring, those savings add up quickly. Over five years, that’s £200 back in your pocket.
A draught-free home also simply feels more comfortable. No more cold spots or reaching for an extra jumper when sitting near windows.
Signs Your Window Seals Have Failed
Before grabbing your toolbox, let’s make sure you actually need to reseal your windows. Here are the telltale signs to look for:
Visible Gaps and Cracks
Take a close look at your window frames. Can you see daylight peeking through? Are there visible cracks in the sealant?
These obvious signs indicate your window seals need attention right away.
The Draught Test
Light a candle and slowly move it around the edges of your closed windows. If the flame flickers or the smoke shifts direction, you’ve found a draught.
This simple test can reveal air leaks that might not be visible to the naked eye.
Foggy Glass in Double Glazing
Noticed condensation or fogging between the panes of your double-glazed windows? This is a telltale sign that the seal has broken, allowing moisture to enter the space between the glass.
Once this happens, the insulating properties of double glazing are compromised.
Rising Energy Bills
Have your heating bills crept up despite similar usage patterns? Failing window seals could be the culprit.
According to MyGlazing.com, up to 25% of a home’s heat can escape through poorly sealed windows.
The Cold Hand Test
On a chilly day, place your hand near the window frame. Feel a noticeable drop in temperature compared to the rest of the room?
That temperature difference suggests your window seals aren’t doing their job properly.
DIY Window Resealing Guide
Rolling up your sleeves to tackle window draughts yourself? Smart move. You might be able to make it with your DIY skills.
Tools and Materials You’ll Need
You need to gather these essentials before starting:
| Item | Purpose | Approx. Cost (£) |
|---|---|---|
| Caulking gun | Apply sealant | 10–15 |
| Silicone/acrylic sealant | Seal gaps | 5–10 per tube |
| Utility knife | Remove old sealant | 5–10 |
| Silicone remover | Clean frame | 5–10 |
| Rubbing alcohol | Degrease surface | 3–5 |
| Weatherstripping | For movable parts | 5–10 per roll |
| Rags/paper towels | Cleanup | – |
The total cost typically ranges from £25-40, depending on how many windows you’re tackling.
Step-by-Step Resealing Process
- Locate all leaks: Run your hand around the window on a cold day to find where draughts are coming in. Mark these spots with masking tape for reference.
- Remove old sealant: Use your utility knife to carefully scrape away old, cracked caulk from window frame joints. Don’t rush this step—proper removal ensures better adhesion.
- Clean the frame thoroughly: Wipe away dust and debris, then clean with silicone remover. Follow up with rubbing alcohol to degrease the surface completely. Let it dry fully.
- Apply new sealant:
For caulking: Load your sealant into the caulking gun. Cut the nozzle at a 45° angle. Apply a smooth, continuous bead along the gap, aiming for a 1/4-inch thickness. Smooth with a wet finger or sealant tool.
For weatherstripping: Measure and cut strips to fit. Peel off the backing and press firmly into place. Ensure it creates a seal but doesn’t prevent proper closing.
- Pay special attention to corners: Corners are common leak points. Apply sealant to one side first, then the adjacent side, pushing them together at the corner.
- Allow proper curing time: Generally, allow 24 hours for silicone sealant to cure completely. Avoid operating the window during this time.
- Test your work: Once everything has dried, check for any remaining draughts on the next windy day.
When to Call a Professional Glazier
While DIY resealing is possible, professional window resealing offers significant advantages that make it the recommended choice for most homeowners:
Why Choose Professional Window Resealing
Professional glaziers have specialized tools and materials that ensure a more effective and durable seal. Their experience allows them to identify underlying issues that amateur eyes might miss.
Professionals also work more efficiently, completing the job in a fraction of the time it would take most homeowners. The peace of mind that comes with professional workmanship and guarantees is invaluable, especially when considering long-term energy savings.
Expert Window Resealing Services
Rather than struggling with DIY approaches that might not deliver lasting results, contacting window specialists at GT Glazing ensures the job is done right the first time, potentially saving you money in the long run through better energy efficiency.
UK Support Schemes for Window Improvements
You might qualify for help with window improvements through various UK schemes:
The Energy Company Obligation (ECO4) requires major energy suppliers to fund efficiency improvements for vulnerable households with poor energy ratings (EPC band D-G).
Some local councils offer grants or subsidies for energy-efficient home improvements through programs like the Home Upgrade Grant (HUG).
Scotland has the Home Energy Scotland program, while Northern Ireland runs the Affordable Warmth Scheme, both of which can help eligible households.
Check your local council’s website or contact the Energy Saving Trust for information about current schemes in your area.
Final Thoughts
Resealing your windows is one of the quickest, most cost-effective ways to boost energy efficiency at home — and you’ll feel the difference straight away.
At GT Glazing, we deliver expert window resealing services designed to eliminate draughts, improve insulation, and help lower your energy bills. Our experienced team will assess your windows and apply the best solution for lasting results.
Stay warm, reduce waste, and enjoy a more efficient home — all with GT Glazing.
