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Welcome to our website. Please read about what we do and don't be afraid to get in touch if you'd like to book.

@info@goldenratiojoinery.com

Get a quote

Call on: 02034881695 Or try: 07507391329

If you’d like a call back please send us a number to contact you

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As FENSA-registered installers with City & Guilds certification, our joinery work meets strict UK building regulations.

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Expert Sash Window Restoration & Joinery Across London

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. Explore our full service map below to find a specialist in your local area.

FENSA Registered & City & Guilds Certified
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London Sash Window Services: Frequently Asked Questions

Do you provide sash window repairs in North London?

Yes, Golden Ratio Windows provides expert sash window repairs across North London, including Islington, Finsbury Park, and Highbury. We specialize in draught-proofing, cord replacement, and timber rot restoration.

Are your new sash windows energy efficient?

Absolutely. Our replacement sash windows feature slimline double glazing and high-performance weather seals, maintaining heritage aesthetics while meeting modern thermal efficiency standards.

How long does a sash window restoration take?

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.

Why choose us?

We know that choosing the right company to complete work on your property can be difficult and time-consuming. Below we have highlighted some reasons to choose us for your next project.

  • Great Rates & Quotes

    Here at Golden Ratio Windows we strive to give all of our customers the best quotes we can, and constantly research our competitors so that we can keep doing so, time and time again. Are you looking for a sash windows and doors quote? Look no further!

  • A Name You Can Rely On

    We strive to be a company that you can rely on. That’s why we arrive on time each day, and are well equipped for the job at hand. Doing so means that we can always stick to a predetermined time scale, and the initial quotation that we have provided.

  • A Time Served Team

    We are time served sash windows and doors company and have many years experience working within trade. Throughout our many years operating in London we have built up a wealth of experience along with a long list of satisfied customers.

  • Quality through and through

    Our work is of the highest quality due to our attention to detail and the fact we only use the highest qualtiy materials. We hand pick using only the most reliable and reputable suppliers. The time and care in which we put into picking our materials may seem unimportant, but these small touches result in a far superior finish that can stand the test of time.

  • Highly recommended

    Most of our work is gained through word-of-mouth recommendations, which goes to prove just how much care we put into our work. Many of our previous clients return to us for other work.

Here at Golden Ratio Windows we have built up an excellent reputation in our local area by offering the most comprehensive and expert service in London. From the planning stage to the finished article; we are with you every step of the way, making sure that whatever the task, you are completely satisfied with the end result. You can also rest assured that you will be receiving a professional, yet personal service for each job that we attend.

See our services

With so many years working in the trade, we are happy to answer any queries and provide quotes for any work that you are looking to have done. If you are in need of any work in London or the surrounding areas, then give us a call on 02034881695, or send us a message through our contact page.

Contact us