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London's trusted window installation service — call us for a free site survey.
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Golden Ratio Windows provides expert sash window repair, restoration, and replacement across every London borough. Find your area below and see the services we offer near you.
Golden Ratio Windows is London's premier specialist in the repair, restoration, and replacement of traditional timber sash windows. Our master joiners understand the unique architectural heritage of London's diverse boroughs — from the iconic Victorian terraces of Islington and Hackney to the prestigious Georgian estates in Fulham and the City of London.
Whether you are looking to improve thermal efficiency with slimline double glazing in Camden or require delicate timber rot repairs for a Grade II listed building in Muswell Hill, our FENSA-registered team provides bespoke solutions. We combine time-honored craftsmanship with modern draught-proofing technology to ensure your home remains energy-efficient without losing its historic character.
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Yes, Golden Ratio Windows provides expert sash window repairs across North London, including Islington, Finsbury Park, and Highbury. We specialise in draught-proofing, cord replacement, and timber rot restoration.
Absolutely. Our replacement sash windows feature slimline double glazing and high-performance weather seals, maintaining heritage aesthetics while meeting modern thermal efficiency standards.
A typical restoration project for a standard London terrace can take between 2 to 5 days, depending on the extent of timber decay and the number of windows involved.
From the planning stage to the finished article; we are with you every step of the way, making sure you are completely satisfied with the end result.
We are fully FENSA registered and compliant with all modern building regulations, ensuring a secure and certified installation every time.
Rest assured you will be receiving a professional, yet personal service. We are happy to answer any queries and provide accurate quotes for any work across London.