Free Quote — Hartwell Sash
Rotten timber repairs, sash cord replacement,
draught proofing, repainting and slimline glazing
for London's period homes.
5yr Workmanship Guarantee
Careful repairs.
Proper restoration.
From rotten timber repairs and broken sash cords to full restoration, bespoke sash windows and slimline glazing — carried out carefully, with respect for the original character of your windows.
Repair what can be saved.
Replace only what cannot.
Old timber windows were built to last. Many simply need careful repairs, proper draught proofing, accurate glazing and attention to detail — not replacement.
Show us the problem.
We'll tell you what's worth repairing.
Send a picture of your window and we'll come back with a clear, honest price. Free survey. No obligation. Most repairs completed in a single visit.
Honest work.
Done properly.
We give you a straight assessment, a clear price, and work that lasts. No upselling, no subcontracting, no surprises.
Repair before replacement
Many windows written off by other companies can be fully restored at a fraction of the cost. We always tell you which is genuinely necessary.
Listed buildings & conservation areas
Experienced with listed buildings and conservation areas across London. We understand the requirements of period properties and the planning constraints that often come with them.
Same-day response
Send photos on WhatsApp and we'll come back with clear, honest advice and a price — usually the same day. Free survey, no call-out fee, no obligation.
5-year workmanship guarantee
All work is backed by a workmanship guarantee of up to five years. We stand behind what we do — if something isn't right, we'll fix it.
One person, start to finish
No subcontractors, no middlemen. The same person surveys, quotes and carries out the work — so nothing gets lost in translation.
Most repairs in a single visit
Broken sash cords, draught proofing and glass replacement are often completed in a single visit. Minimal disruption to your home.
Nick replaced broken sash cords quickly and efficiently. Very tidy work — wouldn't hesitate to book again.
Clear communication and fast work — exactly what you want. Arrived on time, left everything spotless.
Outstanding craftsmanship. You can tell this is done by someone who really cares about the work.