Draught proofing sash windows: what's involved and what you'll notice

Timber sash windows are designed to slide, and anything that slides needs a little clearance. Over the years that clearance grows as timber shrinks, beads loosen and parting beads wear. The result is the familiar list of complaints: cold air in winter, rattling on windy nights, dust on the sill and more street noise than you'd like. Draught proofing fixes this while keeping the original window.

Where the draughts come from

On a typical sash window, air gets in through several places at once:

• Along the sides, where each sash slides past the frame and the beads.

• In the middle, where the top and bottom sashes meet.

• At the bottom, where the lower sash sits on the sill.

• At the top, where the upper sash meets the head of the frame.

Sealing just one of these makes little difference. Proper draught proofing deals with all of them.

What's involved

Matt removes the sashes from the frame so each one can be worked on properly. Any paint build up is cleaned back and the sashes are checked for wear, loose joints or damage. Discreet seals are then fitted around the sashes and the frame so the gaps are closed when the window is shut, but the sash still glides when you open it.

Because the window is already apart, this is also the ideal time to replace worn cords, rebalance the weights, or fix sticking. Many customers combine draught proofing with sash cord replacement or spiral balance repairs for exactly that reason.

Will it change how my windows look?

No. The seals sit within the frame and are hard to spot once the window is back together. From the street and from inside the room, the window looks the same. That makes draught proofing a good fit for period and heritage homes where the original appearance matters.

Will the window still open?

Yes. Good draught proofing should leave the window easy to open and close with one hand. If a sash feels tight afterwards, something hasn't been set up correctly. Matt checks every sash for smooth movement before the job is signed off.

What you'll notice afterwards

• Rooms feel less draughty, especially on cold or windy days.

• Rattling stops, so windows are quiet at night.

• Less dust and fewer insects find their way in.

• Street noise is noticeably reduced.

• Heating and cooling can work more effectively, because less air is escaping.

How long does it take?

It depends on the number and condition of the windows. Simple sashes in good condition are quicker; windows with paint build up, broken cords or old damage take longer. Matt will give you a clear idea of timing when he quotes.

Is it worth doing on every window?

You'll get the most benefit in rooms where you feel the draught or hear the rattle, such as bedrooms and living areas facing the street or prevailing wind. Many people start with those rooms and do the rest of the house later.

Find out more

See the draught proofing service page for an overview, or check the problem guide if your windows have other issues too.

Book a quote

Call Matt on 0409 448 107 or send him a photo through the quote form. Every job is quoted, overseen and signed off by Matt.