Draughty Windows: Causes and Solutions

A draughty window is uncomfortable and expensive — cold air in, warm air (and money) out. The cause is usually one of a few things, and not all of them mean new windows.

Common causes

• Worn gaskets or seals that have hardened or shrunk.
• Dropped or misaligned sashes not closing tightly.
• Failed hardware — hinges or locks that no longer pull the sash in.
• Gaps around the frame where old sealant has perished.
• Single glazing that’s cold to begin with.

Fixes, cheapest first

Many draughts are a quick repair: new seals, an adjustment, or re-sealing the perimeter. Where frames are old, rotten or single-glazed, replacement with modern, well-sealed units meeting 1.4 W/m²K (WER Band B) is the lasting answer.

Get quotes for a repair or replacement and feel the difference next winter.

Frequently asked questions

How do I find a draught?

On a windy day, move a hand or a lit candle flame around the closed window — movement shows the gap.

Is draught-proofing worth it before replacing?

If frames are sound, new seals are cheap and effective; if they’re failing, put the money toward replacement.