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We specialise in the repair, restoration, and replacement of traditional timber sash windows across Tooting. Our master joiners blend traditional craftsmanship with modern techniques to preserve your home's character and improve thermal efficiency.
No obligation · Free site survey · Reply within hours
Golden Ratio Joinery Ltd provides expert Sash Window Replacements for period homes throughout Tooting (SW17) and London.
Sometimes a sash window is simply too far gone — rot has spread through the box, the timber is beyond economical repair, or a previous owner fitted unsympathetic uPVC. When that happens to a Tooting home, the answer is a bespoke timber replacement made to match the original exactly, not an off-the-shelf compromise.
Every replacement we make is hand-built to the precise proportions of your existing windows — the same sight lines, glazing-bar layout, and run-through horns that give Tooting's period properties their character. The difference is what's inside:
We build in Accoya, a modified timber that resists rot and movement and carries a 50-year anti-rot warranty — so your new windows will outlast the originals.
Discreet double-glazed units cut heat loss and street noise dramatically while keeping the slim, period-correct appearance that conservation areas require.
Every replacement is fully weather-sealed and installed to current building regulations, with FENSA certification provided for your records and future sale.
Large parts of Tooting are covered by Wandsworth conservation area controls, including the Heaver Estate Conservation Area, which means replacement windows usually have to match the original design closely. This is exactly where we specialise — supplying conservation-grade timber windows that satisfy the council while delivering modern thermal performance. We handle the detail so your project runs smoothly.
Not sure whether you need a replacement or a repair? Our honest surveyors will always recommend repair or restoration where it makes sense. See our price guide or browse all areas we cover, including neighbouring Wimbledon.
Book a free, no-obligation site survey with our FENSA-registered joiners. We will assess your windows, explain your options honestly, and give you a transparent written quote. Call 020 3488 1695 or request a callback today.
We also provide expert sash window replacements across these neighbouring London areas:
A selection of recent sash window repairs, restorations and installations completed for homeowners across Tooting and North London.
Finsbury Park
"Saved our original Victorian windows when others said replace. Beautiful workmanship — our sash windows look brand new."
Stoke Newington
"Draughts completely gone. Warm house for the first time in years. Fair price and they clearly know period properties inside out."
Central London
"They completely replaced two windows in our Edwardian home. Friendly, communicative and done quickly — in just 2 days."
North London
"The detailing is very well done and accentuates the property nicely. The whole front of the house looks much better as a result."
Queens Park
"The window is perfect. I couldn't be happier."
Yes. We regularly carry out sash window repair and restoration services in Tooting and all surrounding boroughs. We offer free site surveys for all local residents.
Yes, absolutely. We specialise in retrofitting slimline double-glazed units into original timber sash windows. This means you don't have to rip out the entire window box, saving money and preserving the historical character of your property.
Costs vary depending on the extent of the damage (e.g., rotten sills vs simple broken cords). However, repairing is almost always significantly cheaper than a full replacement. We provide completely transparent, itemised quotes after a free survey.
Stop the draughts and start saving on energy bills. We offer a free, no-obligation survey and quote for all window upgrades across London.
218 Hornsey Road, London, N7 7LL
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