When the cooler months arrive and the rain starts to fall, many Australians notice just how much warmth escapes through a poorly sealed door. A door that doesn’t close tightly can let in draughts, moisture and even pests – but the good news is that it’s usually easy to fix. Here’s a simple guide to help you keep your home comfortable and dry, without needing professional help.

Check where the draughts come from

Before you start sealing, find out exactly where the problem is. On a windy day, hold a lit incense stick or a strip of tissue near the edges of the door. If the smoke or paper moves, air is getting through. You can also run your hand along the frame to feel for cool air.

Often, the rubber or foam seals around the door have become brittle or cracked over time. In other cases, the door may have shifted slightly due to changes in humidity or temperature, leaving small gaps around the frame.

Replace worn weather seals

The most effective way to stop draughts is to replace the old weather seals. You can find a wide range of self-adhesive or push-in seals made from rubber, silicone or foam at hardware stores like Bunnings or Mitre 10. Choose a type that suits your door and frame profile.

1. Gently remove the old seals and clean the surface to remove dust and adhesive residue.
2. Measure the sides and top of the door, and cut the new seals to length.
3. Press or stick them firmly into place, ensuring an even fit all the way around.

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

Don’t forget the bottom of the door

Even with good seals around the edges, draughts often sneak in underneath. To fix this, install a door sweep or draught stopper. These come in various styles – from flexible rubber strips to brush seals that move smoothly over the floor as the door opens and closes.

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

Adjust hinges and latches

A door that hangs unevenly can create small gaps where air and moisture slip through. Check that the door closes evenly all the way around. If it rubs at the top or bottom, adjust the hinges slightly with a screwdriver. Sometimes just a small tweak is enough to make the door fit snugly again.

Also check that the latch lines up properly with the strike plate. If the door doesn’t click firmly into place, it may not be sealing as it should.

Prevent moisture and mould

A poorly sealed door doesn’t just let in cold air – it can also allow dampness to creep inside. When warm indoor air meets a cold, wet surface, condensation can form, leading to mould or mildew. Make sure your door is well sealed and that water doesn’t pool at the threshold after rain.

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

Consider upgrading to a new door

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

While a new door is a bigger investment, it can quickly pay off through lower energy bills and improved comfort.

A small job with big rewards

Sealing a door doesn’t require special tools or advanced DIY skills – just a bit of time and care. The result is immediate: a warmer, drier home, fewer draughts and lower heating costs.

So next time you feel a chilly breeze sneaking in, you’ll know what to do – a few new seals, a quick adjustment, and your door will be sealed tight with ease.