Sash windows in Berkshire — the problems we get called about
Period sash windows are a defining part of a Berkshire property's character — and the county has plenty of them. Ageing frames lead to draughts, peeling paint, poor insulation, and rising heating bills. The older the house, the harder those problems are to ignore.
We specialise in sympathetic restoration — traditional joinery alongside discrete modern improvements that preserve the original window whilst making the rooms easier to live in. Twenty-five years of work on sash and casement frames, mostly across the Home Counties and the Thames Valley.
What we see most often in Berkshire houses:
- Rotten window frames where rain has worked its way into the cill or the bottom of the stiles.
- Heat loss through single glazing — a typical U-value around 5.0 W/m²K, against a modern wall at ~0.3.
- Persistent draughts and rattling from worn parting beads and seals.
- External noise from the M4, the Great Western mainline, and the A-roads through the county.
- Condensation buildup on cold internal glass, leading to staining and decay around the cill.
Restoring wooden windows in Berkshire
When sash windows start showing the signs — draughts, rot, outdated glazing — it's time to act before the damage compounds. We focus on sash and casement repairs and upgrades, blending traditional workmanship with modern energy-efficient materials.
Rotten window frame repair
We splice-repair decayed timber: cut out the rot back to sound wood, scarf in matched joinery, treat the surrounding timber, prime and paint. The window is structurally the same window, with a new section spliced in where the old one had failed.
Sash window draught-proofing
Brush seals and weatherstripping fitted into the stiles, meeting rails, and cills. Done well, the rattle goes and the heat stops leaving through the gaps around the sash.
Sash, casement, and bay window repair
The same principle applies across the period stock — sliding sashes, side-hung casements, multi-pane bays. Keep what's sound, replace only what has failed, end up with smooth operation and a clean painted line.
Double-glazing retrofit for Berkshire sash windows
Many Berkshire homes with traditional sash windows still run on single glazing. Heating bills creep up every year; comfort goes the other way. A double-glazing retrofit drops the U-value at the glass from ~5.0 to ~0.7 W/m²K — triple-glazed thermal performance inside an 8 mm vacuum-insulated unit, with the original sashes left in place.
The retrofit also cuts external noise meaningfully, particularly the low-frequency rumble from traffic on the M4 and the trains through Reading and Slough. The original line of the window is preserved — the glazing bars, the horns, the proportions all stay.
Our service area in Berkshire
We cover the whole county. The towns where we work most often:
- Reading
- Slough
- Windsor
- Maidenhead
- Newbury
- Wokingham
- Bracknell
- Thatcham
- Hungerford
Outside Berkshire we cover the neighbouring counties too — Buckinghamshire, Surrey, Oxfordshire, Hampshire — and the West London catchments.
Frequently asked questions
Can existing sash windows be upgraded with double glazing?
Yes. We retrofit vacuum-insulated double glazing into the original sash frames, improving energy efficiency and noise reduction without compromising the period aesthetics or the original sightline.
What are the signs my sash windows need restoration?
Sticking sashes, draughts you can feel from across the room, peeling paint, minor decay around the cill or the bottom of the stiles — restoration is usually the right call. Severe structural damage is rarer, and we cover that case at the survey.
Do you handle listed and conservation-area work in Berkshire?
Yes. A large share of our Berkshire work — particularly in Windsor, Reading and Newbury — is on listed buildings or in conservation areas. We manage the consents, correspond with the conservation officer, and work to the spec they sign off.