Tired of Drafts? Simple Ways to Make Your Windows Work Better

Windows become draughty for several common reasons. The most frequent cause is deteriorated weatherstripping and seals that have perished, compressed, or pulled away from the frame over time. Gaps between the window frame and the surrounding wall, caused by shrinking caulk or settling brickwork, also allow cold air in. Warped or cracked timber frames, particularly in older properties, can create openings that let draughts through. Single-glazed windows offer minimal insulation and are inherently draughty. Poor original installation can leave persistent gaps. Identifying the specific cause is the first step toward an effective fix.

Draughty windows can significantly increase heating costs. According to the Energy Saving Trust, heat loss through windows accounts for around 10-15% of total heat loss in a typical UK home. If windows are poorly sealed or single-glazed, this figure can be considerably higher. Upgrading from single glazing to A-rated double glazing could save around £100 to £175 per year on energy bills for a typical semi-detached house. Even simpler measures like replacing weather stripping and sealing gaps can reduce heat loss noticeably, potentially saving £25 to £50 per year depending on the severity of the draughts.

The cheapest way to stop window draughts is to apply self-adhesive foam or rubber weatherstripping around the window sashes, which costs just a few pounds from any DIY store. Applying exterior-grade caulk to seal gaps between the frame and wall is another low-cost fix. Fabric draught excluders placed along window sills can block cold air for under £10. For single-glazed windows, window insulation film kits cost around £10 to £20 and create a temporary secondary glazing effect. Heavy curtains or thermal blinds also help reduce draughts and heat loss at minimal cost, particularly during winter evenings.

The decision depends on the age, condition, and type of your windows. If your windows are relatively modern double-glazed units with deteriorated seals, replacing the weatherstripping and resealing gaps is often sufficient and much cheaper than replacement. For older timber windows in good structural condition, draught-proofing and secondary glazing can significantly improve performance. However, if your windows are single-glazed, have damaged or rotting frames, or are persistently draughty despite repairs, replacement with modern double or triple-glazed windows is usually the most cost-effective long-term solution, offering better energy efficiency, security, and comfort.

Yes, secondary glazing is an effective solution for reducing draughts and improving insulation in existing windows. It involves fitting a supplementary pane of glass or acrylic on the inside of the existing window, creating an insulating air gap. Secondary glazing can reduce heat loss by up to 65% compared to single glazing alone and significantly cuts draughts. It is particularly popular for listed buildings and conservation areas where replacing the original windows is not permitted. Costs typically range from £100 to £400 per window depending on the type and quality, making it cheaper than full window replacement.

There are several simple ways to check for window draughts. Hold a lit candle, incense stick, or thin strip of tissue paper near the edges of your window frame on a windy day. If the flame flickers, the smoke wavers, or the tissue moves, you have found a draught. Run your hand slowly around the window frame edges to feel for cold air. On very cold days, check for condensation patterns on the glass, as uneven condensation can indicate air leaks. You can also try the paper test: close a sheet of paper in the window and if it pulls out easily, the seal is not tight enough.