Business Details
Trusted Window and Door Installers in London
Golden Ratio Windows is a London-based joinery specialising in bespoke sash and casement windows, door installations, and wooden conservatory replacements. With many years of experience serving London and surrounding areas, our highly qualified team delivers professional, reliable services that exceed expectations while meeting deadlines. We pride ourselves on using only the highest quality materials sourced from reputable suppliers, ensuring durable, superior finishes. Our commitment to customer satisfaction is evident from the planning stage to project completion, offering a personal yet professional service for every job.As a trusted name in the industry, we provide competitive quotes and maintain transparency throughout our work. Our expertise extends to sash window restoration, double glazing installations, and tailored solutions for replacing old windows. Built on a foundation of word-of-mouth recommendations, we have established an excellent reputation for comprehensive, expert services. Whether for new builds or restoration projects, our time-served team combines meticulous craftsmanship with a client-focused approach to ensure complete satisfaction.
Services
Sash Windows
Casement Windows
Door Installations
Conservatory Replacements
Shopfronts
Double Glazing
Window Restoration
Fire Rated Doors
Bi-Folding Doors
Stained Glass
Highlights and features
- We have many years of experience in London's joinery industry.
- We provide competitive quotes and match competitor pricing.
- Our work uses only high-quality materials from reputable suppliers.
- We offer reliable, on-time service with clear timeframes.
- We are highly recommended by satisfied clients across London.
Services
Sash Windows
We manufacture and install bespoke sash windows tailored to London properties. Our sash windows combine traditional craftsmanship with modern efficiency, offering durability and aesthetic appeal. Perfect for heritage or contemporary homes requiring high-quality replacements.
Casement Windows
Our casement windows provide excellent ventilation and security for residential and commercial properties. Custom-made to fit your space, these windows feature energy-efficient designs and premium materials for long-lasting performance.
Door Installations
We offer professional installation of entrance doors, bi-folding doors, and fire-rated doors. Our solutions enhance security, insulation, and visual appeal while using durable materials suited to London's climate.
Window Restoration
Specialist restoration services for historic sash windows, preserving original features while improving functionality. We repair damaged frames, replace glass, and ensure smooth operation for period properties across London.
Double Glazing
Upgrade to energy-efficient double glazing that reduces heat loss and noise pollution. Our installations meet modern standards while maintaining the character of London homes through custom designs.
Questions
What areas do you serve?
We operate throughout London and surrounding areas, providing window and door installation services for residential and commercial properties.
Do you offer sash window restoration?
Yes, we specialise in sash window restoration, preserving original features while improving functionality and energy efficiency for London's period properties.
Are your installers qualified?
Our team consists of fully qualified, time-served professionals with extensive experience in window and door installations across London.
Can I get a quote online?
Contact us via phone or email to receive a free, competitive quote tailored to your specific window or door installation requirements.
What materials do you use?
We use only high-quality materials sourced from reputable suppliers to ensure durability, performance, and aesthetic appeal in all our installations.
Do you handle commercial projects?
Yes, we provide bespoke window and door solutions for commercial properties, including shopfronts and fire-rated doors, maintaining professional standards.
Reviews (4)
James Collins
Nov 03, 2025
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The team at Golden Ratio Joinery are awesome! We had Victorian bay windows and side windows replaced with different colours outside and in. Fantastic finish, the team are professional and work very hard to achieve a flawless result. I'd highly recommend and Hoda is always very diligent and responsive, thank you!
Johanna Freeland
Jul 12, 2025
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We honestly cant thank the amazing team at Golden Ratio enough. They helped us bring our dream to life, putting traditional sash windows back into our home, something weve wanted to do for over 13 years. The quality of the windows is outstanding, but just as importantly, Hoda and Gentian are such hardworking, honest, and genuinely lovely people. Thats not something you come across often, and were so glad we found them.
We were quite particular about wanting to match the original windows on our street as closely as possible, and Golden Ratio went above and beyond to get every detail just right. They look like theyve always been part of the house.
Were so grateful to Hoda and Gentian, and well definitely be working with them again in the future.
We were quite particular about wanting to match the original windows on our street as closely as possible, and Golden Ratio went above and beyond to get every detail just right. They look like theyve always been part of the house.
Were so grateful to Hoda and Gentian, and well definitely be working with them again in the future.
Varun Bakshi
Jun 27, 2025
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We got this beautiful crittall styled door done in our guest room, facing the front facade. This was a tricky project due to the odd size of the door and constraints related to safety & ventilation. However Genti was really accommodating and patient with us as we landed on the final design of the door, which we were really happy with. Will definitely look to engage with Golden Ratio again in the future. Big thank you to the team, Hoda and Genti!
Dan
Jun 14, 2025
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Golden Ratio replaced our bay windows and two other windows with double-glazed sash windows. I cannot recommend them highly enough. The windows are absolutely beautiful and move perfectly. I was really impressed with the end-to-end process: the communication, explanations and professionalism throughout, while the workmanship and materials quality are clearly first-rate. Thank you so much to Hoda, Genti, Klodi and everyone else @ GR Joinery.
