Draughty Windows: Causes and How to Fix Them
20 November 2025 · 5 min read
If you can feel a draught by the window, you're heating the street. Here's what causes it and how to stop it.
Where draughts come from
Most window draughts come from worn or perished seals and beading, gaps where the frame meets the wall, or windows that no longer close tightly because hinges and mechanisms have worn. On older sash windows, gaps between the sliding sashes are a classic culprit.
A quick test on a windy day with the back of your hand will usually reveal where the cold air is getting in.
The right fix for the cause
Replacing perished rubber seals and draught-proofing strips is inexpensive and very effective. Re-sealing around the frame externally stops gaps to the wall. If the window will not close tightly, adjusting or replacing hinges and handles restores a proper seal. Sash windows can be draught-proofed without spoiling their look.
If the glazing itself is failing — misted or cracked — that may need a new sealed unit.
Worth doing before winter
Draught-proofing is one of the cheapest ways to make a home warmer and cut heating bills. It also reduces condensation and noise. A glazier can quickly identify whether you need new seals, adjustments, or replacement units, and put it right in a single visit.
Get in touch for a free assessment of your draughty windows.
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