When restoration won't return weather-tight performance — we replace with bespoke timber sashes engineered to outlast the originals.
Soft-spot test reveals more than 30% rot — structural timber can't be locally repaired.
Pulleys broken, cords snapped, weights missing — sash no longer balances.
Thin panes, condensation, audible street noise. Slim double-glazed units fix all three.
Curtains move with the windows shut. Draught-proofing only goes so far if frames are warped.
Decades of overpainting have closed the gap to the frame. Stripping is hazardous.
Previous owner installed plastic. We restore the period look with modern thermal performance.
Keep the original sash & box.
Best when: frames are sound, glazing acceptable, listed-building constraints.
New sash, original box reused.
Best when: sash failed but box repairable.
Full box & sash replacement.
Best when: box frame failure, major structural movement, full facade refurbishment.
You describe the property, we share an indicative range and book the survey.
Laser-measured to 1 mm. We document profile, glazing pattern, ironmongery, paint colour.
Itemised drawings & specification — no scope creep on install.
Engineered Accoya cores, Sapele faces. Mortise-and-tenon joinery.
Dust-sheeted, vacuumed, no rooms unusable overnight.
Return visit to ease seasonal movement, hand over FENSA & 10-yr guarantee.
14mm sealed unit · 1.4 U-value · krypton-filled · Pilkington K low-e.
26mm Accoya core, brass weather-seal, integrated cam-lock alignment.
Period-correct profile copied from original.
Sapele drip cill, 18° fall, lead apron beneath.
22mm period bead. Through-glass option for proper shadow line.
Solid brass · choice of 6 patinas · Banham-grade security.
Acetylated radiata pine. Dimensionally stable, FSC-certified, 50-year above-ground warranty.
Tight-grained African hardwood. Exceptional rot resistance, period-correct depth of grain.
Slow-grown, high-density. Specified for cottage- and Arts-and-Crafts properties.
Often not for like-for-like replacement in unlisted buildings; we advise after survey and handle listed/conservation applications.
Yes — we laser-measure every bar arrangement and reproduce sight lines for conservation officers.
No — most homes stay fully habitable; we dust-sheet, work room-by-room, and leave watertight each evening.
We follow HSE lead-safe procedures; disturbance is contained and documented where pre-1970 paint is present.
Yes — making-good to internal reveals is included in our fixed quote unless otherwise agreed.
Tell us about the property and we'll come back within one working day.