Menu
London's trusted window installation service — call us for a free site survey.
Get a quote
We specialise in the repair, restoration, and replacement of traditional timber sash windows across Islington. 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 Windows provides expert Sash Window Repairs throughout Islington (N1, N5 & N7) — the borough our workshop calls home.
Based on Hornsey Road in N7, we are Islington's local sash window specialists. From the grand Georgian townhouses of Canonbury and Barnsbury to the tall Victorian terraces around Upper Street, Highbury and the Angel, we repair original timber windows with the traditional joinery skills period properties demand.
We focus on repair over replacement wherever possible — it is cheaper, keeps your home's original character, and satisfies the borough's strict conservation rules. The faults we fix most often are:
Brush-pile draught seals and sash realignment stop cold air and rattles without affecting how the windows operate.
Replaced in pairs, with serviced pulleys and re-balanced weights, so your sashes move freely and stay put.
We splice in matching new timber where sills or rails have rotted, then treat and repaint for a durable, invisible repair.
We ease painted-shut sashes and replace cracked or misted panes, matching original glass where we can.
Islington is one of London's most conservation-dense boroughs — Barnsbury, Canonbury and Duncan Terrace among many — where original timber windows are effectively mandatory. Our repairs use traditional methods that satisfy local planning guidelines and keep the historic streetscape intact. Once our structural repairs are complete, many clients use Industry Decorators for expert painting in Islington.
Where a window needs more than a repair, we offer full restoration and like-for-like replacement, and we cover neighbouring Highbury, Finsbury Park and Holloway.
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 repairs across these neighbouring London areas:
A selection of recent sash window repairs, restorations and installations completed for homeowners across Islington 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 Islington 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
Fill in the form and we'll get back to you within one business day.
