Sash Window Restoration London
Full Overhaul · Heritage Methods · FENSA Registered
We restore original timber sash windows to full working order across London. Re-cording, draught-proofing, timber repairs, double glazing upgrades — all carried out by specialist craftsmen. 50–70% cheaper than replacement. Conservation areas and listed buildings our speciality.
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Restore Your Original Sash Windows to Full Working Order
Original Victorian and Georgian sash windows were built from old-growth timber far harder and more durable than anything available today. With a full restoration, they can perform like new and last another century — at a fraction of the cost of replacement.
At Golden Ratio Windows, restoration is our core philosophy. We strip your existing windows back to their frames, repair and reinstate every component, and return them to you draught-free, smoothly operating, and thermally improved. Your home keeps its character. Your budget stays intact.
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What's Included in a Full Restoration
Every restoration follows our proven 4-stage process:
- Stage 1 — Assessment & Strip — windows removed from the box, all components inspected, all paint and debris removed from the frame and sashes.
- Stage 2 — Mechanical Service — new sash cords fitted, pulleys cleaned and lubricated, weights re-balanced for smooth operation.
- Stage 3 — Timber Renovation — rotten sections spliced out and replaced, cracks filled, sills repaired, all timber primed with microporous paint.
- Stage 4 — Draught-Proofing — concealed brush pile seals fitted throughout the box frame. Eliminates draughts, rattles, and significantly reduces heat loss and noise.
Optional upgrades: slimline double glazing units, new heritage hardware, full external redecoration.
How Much Does Sash Window Restoration Cost in London?
A full restoration costs 50–70% less than replacement. Our typical restoration costs are:
- Full Restoration (re-cord, draught-proof, timber repairs) — from £400–£800 per window.
- Draught-Proofing Only — from £250–£350 per window.
- Re-Cording Only — from £100–£150 per window.
- Double Glazing Upgrade — quoted per window based on size and specification.
We always provide a fixed, written quote after a free site survey — no surprises on the day.
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Conservation Areas & Listed Buildings
For properties in Conservation Areas or Grade II Listed Buildings, restoration is often the only option planning authorities will approve. Replacing original windows with new units — even timber ones — can require Listed Building Consent, while sympathetic restoration usually does not.
We are highly experienced in heritage restoration work. Our methods use traditional materials and techniques that preserve the original fabric of your windows and satisfy the requirements of London's planning authorities across all boroughs.
We can advise on any planning considerations during your free site survey.
How to Book Your Restoration
- Get in Touch — fill out the form on this page or call us on 020 3488 1695. We'll respond within hours.
- Free Site Survey — one of our London specialists visits your property to assess all windows and recommend the most cost-effective approach.
- Fixed Written Quote — a detailed, no-obligation quote outlining exactly what's included and what it will cost.
- Expert Restoration — our craftsmen carry out the full overhaul, leaving your home clean and tidy at the end of each day.
Real Reviews from London Homeowners
Don't take our word for it — here's what our customers say about our sash window restoration service across London.
London's Go-To Experts for
Sash Window Restoration
We don't push replacements when restoration will do. Saving your original windows is better for your home, your budget, and London's architectural heritage.
50–70% Cheaper Than Replacement
A full restoration costs a fraction of new windows. For a typical London Victorian terrace, restoring all windows instead of replacing them saves thousands of pounds.
Conservation Area Experts
We specialise in Grade II listed buildings and Conservation Areas. Our traditional methods and materials satisfy planning requirements across all London boroughs.
Dramatically Better Thermal Performance
Our draught-proofing system reduces heat loss through your windows by up to 50%. Noticeably warmer rooms, lower energy bills, and no more rattling sashes.
4.9★ — 150+ Reviews
Over 150 five-star Google reviews from London homeowners. Our reputation for precision, care, and genuine respect for original craftsmanship speaks for itself.
Specialist Craftsmen Only
Our team consists of highly trained joiners who work exclusively on heritage timber windows. No general builders or handymen — every job is carried out by a specialist.
All London Boroughs
Based in North London (N7), we cover all of Greater London — Islington, Hackney, Camden, Haringey, Kensington, Chelsea, and every borough in between.
Recent Sash Window Restoration Projects
A selection of recent restorations from across London — original windows brought back to their best.
Sash Window Restoration FAQs
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How much does sash window restoration cost in London?
A full sash window restoration in London typically costs £400–£800 per window, including re-cording, draught-proofing, and minor timber repairs. Draught-proofing only starts from £250–£350 per window. This is 50–70% less than full replacement. We provide a fixed written quote after a free site survey with no surprises on the day.
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What is the difference between sash window repair and restoration?
Repair addresses a specific fault — a broken cord, a rotten sill, a cracked pane. Restoration is a comprehensive overhaul of the entire window: strip-down, new cords, serviced pulleys, timber repairs, concealed draught-proofing, and redecoration. The result is a window that operates and performs like new while retaining all its original character and fabric.
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How long does sash window restoration take?
A full restoration of a single window typically takes one full day. A Victorian terrace with 8–10 windows is usually completed in 3–4 days. We work efficiently and leave your home clean and tidy at the end of each day. Most homeowners are not significantly disrupted during the process.
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Can you restore sash windows in a conservation area or listed building?
Yes — restoration is often the preferred or required option in Conservation Areas and Listed Buildings. Sympathetic restoration using traditional methods and materials typically does not require planning consent, whereas replacement may. We are highly experienced in heritage work and can advise on any planning considerations during your free site survey.
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Does draught-proofing really make a difference?
Significantly. Professional sash window draught-proofing can reduce heat loss through your windows by up to 50%. It eliminates rattling sashes, reduces street noise, and lowers energy bills noticeably. For maximum noise reduction, see our soundproofing sash windows service.
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Can I get double glazing as part of a restoration?
Yes — we can fit slimline double-glazed units into your existing sash frames as part of a restoration. We use slim-profile units that retain the traditional single-glazed appearance and are accepted by most conservation authorities. See our double glazed sash windows page for more detail.
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Should I restore or replace my sash windows?
We always recommend restoration where possible. Original Victorian and Georgian timber is denser and harder than anything available today — when properly restored and draught-proofed, it can last another century. Restoration also preserves the character and value of your property. Replacement is only recommended when the timber is too far gone to save, or when the existing windows are not original to the property. We'll always give you honest advice after assessing your windows.
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What areas of London do you cover?
We cover all of Greater London. We have strong experience across North London (Islington, Hackney, Haringey, Camden, Finsbury Park, Stoke Newington, Highbury, Holloway, Hornsey, Muswell Hill), Central London, and West London. Contact us to confirm coverage for your specific postcode.
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Do you guarantee your restoration work?
Yes — we are fully insured and offer a comprehensive guarantee on all joinery, draught-proofing, and glazing work. Please review our terms and conditions for full warranty details.
Request Your Free
Sash Window Restoration Survey
Whether it's one window or a full house — get in touch for honest advice and a free, no-obligation quote anywhere in London.
218 Hornsey Road, London, N7 7LL
Opening Hours
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