A window is the thinnest part of your house. Get it wrong and you heat the street. Get it right and the room holds its warmth, the traffic goes quiet, and the whole place feels newer than it is.
What our standard sealed unit achieves. A 1970s single pane sits nearer 4.8.
Multi-chambered uPVC that breaks the thermal bridge and stiffens the frame.
On frames, sealed units and hardware, backed by insurance.
Most whole-house installs are in, sealed and cleaned up inside a day.
The outer frame is extruded uPVC with sealed air chambers running its full length. Air is a poor conductor, so each chamber is another wall the cold has to cross. Galvanised steel reinforcement runs inside the section to stop it flexing.
The opening sash carries the hardware load. Ours run on stainless friction stays with a multi-point espagnolette lock — one lever throwing bolts top, bottom and centre into the frame keeps.
The glazing bead clips from the inside. From the street there's nothing to prise. Twin co-extruded gaskets compress against the glass on both faces, which is what actually stops draughts and rain — not the frame.
The cavity is filled with argon — heavier and slower-moving than air. A microscopically thin low-emissivity coating on the inner pane lets short-wave sunlight in and reflects long-wave heat back into the room. A warm-edge spacer stops the perimeter cold-bridging.
Back together, squared, packed and sealed to the reveal. We survey every opening ourselves, so what turns up on fitting day is made for your house rather than trimmed to fit it.
Everything is made in Britain, surveyed by us and installed by our own fitters. No subcontracted crews.
Casement, flush, tilt & turn, sliding sash and bays — A-rated as standard.
Explore
Composite and uPVC entrance doors, French, patio and bi-folds.
Explore
Victorian, Edwardian, lean-to and orangeries — plus warm roof conversions.
Explore
Fascias, soffits, guttering, dry verge and cladding that never needs painting.
Explore
Misted unit replacements, toughened, laminated, obscure and acoustic glass.
Explore
The frame is the part you're not buying. A 70mm profile with a slim outer section gives you more glass in the same brick opening — so the room gets more daylight without anybody knocking a wall about.
The number that matters isn't on the sticker, it's the temperature of the glass when you're sitting next to it. A single pane sits around 10°C on a cold day and pulls the heat off you. An argon-filled low-E unit sits near 18°C, so the cold edge of the room disappears.
Two compressed gaskets and an asymmetric glass build take the edge off road noise. And because the inner pane stays warm, the moisture in the room has nothing cold to condense onto — no more wiping cills in January.
Each wants something different. A flush casement suits a stone frontage in a way a chunky sculptured profile never will — and a bay carrying roof above it needs a structural pole, not optimism.
Victorian terrace · Leeds
Sash frontage
Inter-war semi
Suburban estate
We don't do the four-hour kitchen-table pitch or the discount that expires at midnight. You get a measured survey, a written price, and a date.
Tell us roughly what you need. We'll say straight away whether it's something we do.
Every opening measured, sightlines checked, cills and reveals noted. Bring your questions.
Line by line, per opening, with the glass spec written down. It holds for 30 days.
Made to your survey in Britain. We'll confirm the fitting date once the frames land with us.
Our own fitters. Old frames taken away, installation registered, everything hoovered before we leave.
Whole house done in a day and you'd never know anyone had been. The front room used to be freezing by the window — it isn't now.
Quoted properly, in writing, with the glass spec on it. Three other firms wouldn't do that. Turned up on the day they said.
Had the conservatory roof swapped for a warm one. It's the difference between a room we avoided and a room we live in.
If you're not on the list, ring anyway — we travel for whole-house jobs.
Tell us the rooms, we'll do the rest. Most surveys are booked within three working days.