Sealing Windows and Doors – A Quick Way to Better Energy Efficiency
Sealing Windows and Doors – A Quick Way to Better Energy Efficiency
When the cold creeps in and your heating bill climbs, it’s often around windows and doors that warmth escapes. Even small gaps can make a big difference to your home’s overall energy use. Fortunately, sealing is one of the simplest and most affordable ways to improve energy efficiency – and it’s a job you can easily tackle over a weekend. Here’s how to get started.
Why Sealing Makes a Difference
Draughty windows and doors let warm air leak out while cold air seeps in. This forces your heating system to work harder, using more energy to maintain a comfortable temperature. According to the Energy Saving Trust, draught-proofing around windows and doors could save a typical UK household up to £60 a year on heating bills – and make your home feel warmer and more comfortable.
Sealing also helps prevent condensation and damp, which can occur when cold air meets warm, moist indoor air. So it’s not just about saving money – it’s also about protecting your home and improving indoor air quality.
How to Check for Draughts
Before you start sealing, it’s worth finding out where the biggest leaks are. You can use a few simple methods:
- Candle test: Light a candle and slowly move it around the edges of windows and doors. If the flame flickers, there’s likely a draught.
- Paper test: Close a piece of paper in the window or door. If you can pull it out easily, the seal isn’t tight enough.
- Hand test: On a cold day, run your hand around the frames – you’ll feel the chill where air is getting in.
Once you’ve identified the problem areas, you can decide whether new draught seals will do the job or if the window or door needs more extensive repair or replacement.
Choosing the Right Draught Seal
There are several types of draught-proofing strips, and the right one depends on the type of window or door you have:
- Rubber (EPDM) seals – flexible, durable, and ideal for modern windows and doors.
- Foam strips – inexpensive and easy to fit, but they usually need replacing every couple of years.
- Silicone seals – very elastic and good for uneven surfaces.
- Brush strips – suitable for sliding doors or older windows with larger gaps.
Measure the gap between the frame and the sash before buying. A seal that’s too thick can stop the window from closing properly, while one that’s too thin won’t block the draught effectively.
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Step-by-Step: How to Seal
- Clean the surface: Remove any old seals and adhesive residue. Wipe the area with a damp cloth and let it dry.
- Measure and cut: Measure the sides that need sealing and cut the strip to length.
- Apply the seal: If it’s self-adhesive, peel off the backing and press it firmly into place along the frame. Make sure it sits evenly without gaps.
- Test the closure: Close the window or door to check that it still shuts easily and that the seal fits snugly.
It’s a good idea to inspect your seals every year – especially after winter, when cold and moisture can cause wear and tear.
Don’t Forget Letterboxes and Door Bottoms
Even small openings can cause noticeable draughts. A brush or flap on your letterbox and a draught excluder at the bottom of your door can make a big difference. If you have an older front door, consider fitting an internal draught-proofing panel to reduce heat loss further.
When Sealing Isn’t Enough
If your windows are very old, sealing might only be a temporary fix. Single-glazed panes or warped frames can be replaced with modern double- or triple-glazed units, which provide far better insulation. It’s a bigger investment, but one that pays off through lower energy bills and improved comfort.
A Small Effort with a Big Impact
Sealing around windows and doors is one of the quickest and most cost-effective ways to boost your home’s energy efficiency. It doesn’t require specialist skills or expensive tools – just a bit of time and care. The result is a warmer home, lower energy use, and a more comfortable living environment all year round.
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