As autumn turns to winter and the days grow shorter, many British households start to notice draughts sneaking in around their doors. A poorly sealed door doesn’t just make your home feel chilly – it can also let in damp and drive up your heating bills. The good news is that keeping the cold out is often a simple DIY job. Here’s a practical guide to making sure your door is snug, warm and weatherproof.

Check where the draughts come from

Before you start sealing, find out exactly where the problem lies. A quick test is to hold a lit candle or a strip of tissue near the edges of the door. If the flame flickers or the paper moves, you’ve found a draught. You can also run your hand along the frame on a cold day to feel where the air is coming in – especially around the hinges, lock and bottom edge.

Over time, rubber seals can harden or crack, and wooden doors can shift slightly, leaving small gaps. Identifying these weak spots is the first step to fixing them.

Replace worn seals

The most effective way to stop draughts is to replace the door seals. You can buy self-adhesive rubber, silicone or foam strips from most DIY stores such as B&Q, Wickes or Screwfix. Choose a type that suits your door and frame.

1. Gently remove the old seals and clean away any dust or glue residue.
2. Measure the sides and top of the door, then cut the new strips to size.
3. Press or stick them firmly into place so they form an even seal all the way round.

When you close the door, it should meet a slight resistance – enough to seal properly, but not so much that it’s hard to shut. A well-fitted seal will keep out both cold air and moisture.

Don’t forget the bottom of the door

Even with new seals, a lot of heat can escape under the door. To fix this, fit a draught excluder or door brush along the bottom edge. These come in various styles – from simple rubber strips to flexible brushes that move with the floor as the door opens and closes.

If your door opens directly to the outside, consider adding a threshold seal or weather bar for extra protection against rain and snow. It’s a small upgrade that can make a big difference to comfort and energy efficiency.

Adjust hinges and locks

A door that hangs unevenly can leave tiny gaps where cold air seeps in. Check that the door closes evenly all the way round. If it catches at the top or bottom, adjust the hinges slightly with a screwdriver. Sometimes just a small tweak is enough to make the door fit perfectly again.

Also make sure the latch and strike plate line up properly. If the door doesn’t click shut easily, it may not be sealing as tightly as it should.

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Prevent damp and mould

A draughty door doesn’t just let in cold air – it can also allow damp to creep inside. When warm indoor air meets cold surfaces, condensation can form, leading to mould over time. Make sure your door is well insulated and that water doesn’t collect at the threshold.

If you have a timber door, give it a fresh coat of paint or wood oil every few years. This helps protect it from moisture and extends its lifespan.

Consider upgrading to a new door

If your door is old, warped or beyond repair, replacing it might be the best long-term solution. Modern external doors are designed with better insulation and advanced sealing systems that reduce heat loss. You can even choose models with energy-efficient glazing if your door includes glass panels.

Although a new door is a bigger investment, it can quickly pay for itself through lower heating costs and improved comfort.

A small effort with a big reward

Sealing a door doesn’t require special tools or professional skills – just a bit of patience and attention to detail. The result is immediate: a warmer home, fewer draughts and lower energy bills. And you’ll keep that damp, chilly air firmly outside where it belongs.

So next time you feel a cold breeze by the door, you’ll know what to do: a few new seals, a quick adjustment – and you’ve got a tightly sealed door made easy.