Trusted Fulham sash window company

Would you like replacement or new box sash windows in Fulham, West Brompton, or nearby areas?

London Box Sash Windows specialises in designing, crafting, and installing traditional timber sash windows that are proudly manufactured in our nearby factory. With over 40 years of experience, we have built a strong reputation for delivering bespoke, high-quality products that stand out in the industry.

We take a customer-focused approach to every project, starting with a detailed consultation to understand your plans. Our friendly and experienced team guides you through the process, from the initial consultation to installation. Our team meticulously crafts all our products using cutting-edge technology and expert craftsmanship. We offer a wide selection of box sash and casement windows, ensuring a perfect fit for your home.

Quality and sustainability are at the heart of London Box Sash Windows. Our high-performance windows are designed to reduce CO2 output, helping homeowners embrace sustainable living without compromising style or functionality.

We are also proud of our exceptional reputation.

One customer said:

Jake provided a great consultation and really listened to my requirements. He was confident, yet gentle with his approach and so knowledgable. I received multiple quotes from providers which honestly felt like a waste of time, as they didn’t seem to listen to my needs of wanting timber only. London Box Sash Windows stood out among them all, especially for their expertise and care in period properties. Really competitive pricing as well! Cannot wait to use and would highly recommend!

For further details about our company or services, please call 020 8648 4230.

West Brompton Accoya sash window company

Our Accoya sash windows represent the pinnacle of custom craftsmanship, blending elegant design with exceptional durability. These windows enhance a property’s aesthetic appeal and offer smooth operation and impressive thermal efficiency, making them a valuable addition to any home.

Accoya wood is a top choice for sash windows due to its unique properties and eco-friendly production. The wood undergoes an advanced acetylation process, altering its structure at the molecular level to ensure unparalleled stability and durability. Accoya sash windows withstand London’s variable climate for decades without cracking, swelling, or shrinking. Its sustainable origins and non-toxic production methods make Accoya an environmentally responsible choice, combining strength and beauty with ecological goodwill.

While oak is admired for its classic beauty and durability, Accoya surpasses it in several ways. Thanks to its innovative treatment, Accoya resists rot, decay, and insect damage more effectively. It also offers superior dimensional stability, reducing swelling and contraction over time. Additionally, Accoya’s sustainability credentials, including the use of ethically sourced materials and non-toxic methods, make it a cutting-edge option for eco-conscious homeowners.

One customer explained:

Absolutely brilliant windows. We looked around the competitors but London Box Sash made windows that looked closest to our originals. Key thing to note in my photos is that the weather seals are white and not black like most competitors. Their customer service and quality professionalism was top notch. Thank you.

Get a quote

Drop us a line to discuss your windows

Why choose our sash windows specialists in Fulham, SW10?

In southwest London, Fulham has a mix of period homes and modern developments. Many of the houses boast charming facades, spacious interiors, and access to beautiful green spaces like Bishop’s Park. We believe windows and doors are key features of any home, combining energy efficiency with harmony in architectural style.

We aim to enhance the look, comfort, and value of your property with solutions that blend functionality and design. Whether you need a single window or replace multiple for a larger project, we are committed to delivering tailor-made solutions that meet your requirements.

London Box Sash Windows was founded by John Ellis in 1980. We are still a local and independent window company that prides itself on offering an exceptional service. Customer service is our top priority, and we greatly value the recommendations from our customers, which contribute significantly to our new business.

We take pride in offering our clients a wealth of knowledge and expertise in the timber window and door industry. We are also committed to delivering high-quality products and exceptional service.

See our portfolio for pictures of recent sash window installation projects.

Fulham A+ rated sliding sash window installation

Choosing London Box Sash Windows for your installation ensures you receive top-quality materials that resist rot, decay, and warping. Our double-glazed sliding sash windows offer outstanding insulation, helping to reduce energy bills significantly. All our sash windows are crafted in our London factory, just a few miles away, allowing us to maintain full control over quality.

Installing new sash windows is a great way to improve your home’s energy efficiency while preserving its character. According to the Energy Saving Trust, upgrading from single-glazed to A-rated double-glazed windows in a standard semi-detached home can save around £195 a year on energy costs.

Our team of skilled tradespeople is dedicated to providing excellent service and craftsmanship. By selecting London Box Sash Windows, you will enhance the beauty and efficiency of your home with expertly crafted sash windows designed to withstand the test of time while complementing the unique style of your property.

Jane Watkins

Great service, great quality product and polite professional staff. Very pleased with final result. Seamless from start to finish. Would highly recommend anyone looking to replace their sash windows to use this company.

Aalia Khan

London Box Sash have done a fantastic job. I’ve now used their services around four times, and on each occasion I’ve compared options—yet they consistently stand out as the best by far, offering a great balance of competitive pricing, excellent service, and beautifully crafted products.

Firstly, their windows are stunning, with a wide range of hardware options. I’ve had both sash and casement windows installed, all made from high-quality Accoya wood, which really shows in the finish.

Secondly, the installation team are excellent. They take real care to make good around the windows—whether that’s repainting walls or fixing tiles—so nothing looks unfinished. They’re punctual, respectful of your home, and work efficiently and professionally, often completing installations within half a day.

Thirdly, the entire process—from ordering to survey to installation—is smooth and well-managed. The team feels consistent and personal, with people like Judith handling bookings and payments, and Harry and Jake carrying out surveys. It has the feel of a trusted family business, with knowledgeable staff always on hand to offer helpful advice on the best options.

Lastly, their aftercare is outstanding. Even with more complex installations (my Victorian walls weren’t the easiest!), they are quick to problem-solve and always willing to return promptly if needed.

Overall, I wouldn’t hesitate to recommend London Box Sash.

Christopher Wylde

Very happy with the whole experience here from start to finish. Professional and honest outfit that will do excellent work. Very happy to take on bespoke needs so if you have something slightly different to standard requirements these are the people to go for!

UPDATE: used these guys again for my new house. Nothing has changed: still an excellent service. Nothing is too much trouble, great experience from start to finish. Great aftercare tips upon request. Nothing is too much trouble. You definitely get what you pay for with these guys.

Tracy Clark

Simply outstanding! Everyone we dealt with was super friendly, polite and very efficient. The installation was seamless and they covered everything up with dust sheets and plastic. The windows are stunning and so easy to open. I highly recommend them.

gervase

We recently had our sash windows installed by London Box Sash Windows, and the whole experience was excellent.

Anjelo and Raf, the installation team were respectful, professional, and did a wonderful job. Jake who looked after us on the sales side, was helpful and knowledgeable, Judith kept it all organised.

The sash windows themselves look absolutely beautiful and have completely transformed the appearance of the house. We’ve had a number of compliments from people passing by, which speaks for itself.

Brad V

You do not need to worry because this company make, supply and fit the best windows around.
I have used them well over 10 years on various projects and i would not go elsewhere. What can i say other than ‘superb in every respect’
Their choice of wood and paint is astonishing as they never move or crack and look like they were fitted only yesterday even though my original windows from them are well over 10 years old, i have never had to do anything to them.
I cannot express how brilliant their products are and, their service is fantastic. I would never use any other supplier.

Phil Bowen

We have used London Box Sash Windows twice in the past four years. We can’t speak highly enough of the customer service, the ease of the sales process, the quality of the work and the professionalism of the window fitter. We now have a beautiful set of windows in our house and would not hesitate to recommend them.

Helen Jenkins

I found London Box through Which Trusted Traders and was so glad that we chose them to replace a bathroom window in 2025 following it being damaged through an attempted break-in. We were so impressed with the service given by the company through the assessment visit by Simon, the contact and support through the office of the lovely Judith and the amazing work done in a single day by the wonderful Andy to replace the window. He worked tirelessly all day and cleaned and tidied up beautifully afterwards. Because of their impressive service installing this window we employed them to replace the bay windows on our house which was a much bigger and more complicated job because of issues to do with the state of the bay itself but London Box were more than up to it. This time Harry came to measure up and Judith in the office continued to keep us informed and up to date with the process. Angelo and Raf did a fantastic job on the day installing the new windows. It was a very difficult job but they did amazingly well and we couldn’t be happier with the windows as well as with every aspect of our involvement with the company. Would throughly recommend this company and not hesitate to use them again in future.

Book a sash window survey in any of the nearby locations:-

Acton
And Fulham
Barnes
Battersea
Chelsea
Earls Court
Fulham
Hammersmith
Kensington
North Kensington
Putney
Roehampton
Shepherds Bush
South Kensington
Wandsworth
West Brompton
West Kensington

Would you like a sash window or casement window quote in Fulham?

To learn more about our sash windows or how they could improve your property, please call 020 8648 4230 or email info@londonboxsash.com.

Find out more about sash windows Lewisham.