Why are my windows rattling or whistling?
Worn seals, loose fittings and gaps — cheap fixes for a noise that also means heat is escaping.
- Difficulty
- beginner
- Time
- 45 min
- Read
- 2 min
Short answer
Rattling means the sash is loose in the frame and whistling means air is forced through a gap. Both are usually solved by new draught seals or adjusting the hinges and locking points.
A rattling window is a window with a gap, so it is also a heating problem. The good news is that the same fix addresses both, and it is usually a few pounds of self-adhesive strip.
What you'll need
- Draught excluder strip
- Allen keys (optional)
- Screwdriver
- Silicone sealant (optional)
Step by step
- Find where the movement or the noise is.Push the sash gently from inside — if it moves, that gap is the rattle. For whistling, run a hand round the frame on a windy day, or use a candle and watch the flame.
- Check and tighten the fittings.Hinge screws and handle screws work loose over years. Ten minutes with a screwdriver fixes a surprising number of rattles.
- Adjust the locking points on uPVC windows.The mushroom-shaped cams around the edge of the opening sash can usually be rotated with pliers or an allen key to pull the sash tighter against the seal. Many people never know this adjustment exists.
- Replace the rubber gasket if it has gone hard.The seal around a uPVC window perishes and flattens after ten to fifteen years. Replacement gasket is inexpensive and pushes into the same groove.
- Add self-adhesive draught strip for timber windows.Clean the surface first with sugar soap or it peels within weeks. E-profile or P-profile rubber into the rebate.
- Reputty or reseal loose glass.A rattle from the glass itself rather than the sash means the putty or beading has failed. Rake out the loose sections and replace.
- Seal the gap between frame and wall.Whistling often comes from the frame perimeter, not the opening part. Decorator's caulk inside, exterior sealant outside.
- Check the trickle vents.Some whistling is a trickle vent doing exactly what it is designed for. Do not seal these — the room needs the ventilation. Closing the vent's flap is fine.
Tips
- Do this in autumn. A rattling window on a windy November night is much harder to fix than one in September.
- For a sash window, staff beads and parting beads can usually be adjusted or replaced to take up slack — a specialist job but a well-established one.
- A rattling window is losing heat. The fix pays for itself over a winter, quite apart from the sleep.
Questions people ask
Why does my uPVC window rattle?
Usually a perished gasket or locking cams that need adjusting to pull the sash tighter. Both are cheap and both are frequently unknown to owners.
Should I seal a whistling trickle vent?
No. It is providing deliberate ventilation the room needs. You can close its internal flap, but do not seal it permanently.