London Box Sash Windows Logo

No.1 company for Richmond-upon-Thames and North Sheen sash windows

Replacement sash windows and new sliding sash windows installed in Richmond-upon-Thames, North Sheen and surrounding areas

Our showroom boardering Herne Hill, Tulse Hill, Brixton, West Norwood
Get an instant estimate

London Box Sash Windows is your trusted local expert for bespoke and replacement sash windows. We specialise in designing and crafting custom sash windows and box sash windows using premium Accoya wood and A-rated double glazing.

Accoya wood is an ideal choice for sash windows due to its sustainability and exceptional resistance to rot, decay, and warping. Paired with high-performance double glazing, our sash windows provide excellent insulation, helping reduce energy bills while preserving their classic appeal.

With a proven track record, our team consistently earns high praise on Google reviews and has been a proud member of Which? Trusted Traders since 2011. Known for our commitment to quality and customer satisfaction, we are dedicated to creating sash windows that enhance the comfort, efficiency, and style of your home for years to come.

One recent customer added:

I found London Box Sash Windows through an online search.With my previous company, I did not get any Fensa certificate and the quality of the wood was inferior to the one used by LBSW for similar prices.They offer a 10% discount for their Standby Schedule Saving which gives very good notice for the client as well. I am very pleased with my double glazed window and the people at LBSW are very helpful.

For further information, contact 020 8648 4230.

What makes our North Sheen sash window company the right choice for your new windows?

At London Box Sash Windows, we are dedicated to preserving the timeless charm of sash windows while upgrading your home with modern solutions. Our skilled team uses only premium materials to deliver impeccable sliding sash window installations that honour your property’s traditional aesthetics. This commitment to quality and attention to detail has earned us a reputation as a trusted and highly recommended provider.

Founded by John Ellis in 1980, our company specialises in crafting double-glazed sash windows and doors that are built for durability. Over the decades, we have embraced traditional craftsmanship and modern innovation, investing in advanced machinery and refining our techniques to ensure every product meets the highest standards. Our sash windows seamlessly combine classic elegance with outstanding performance, enhancing homes across the region.

We pride ourselves on educating clients about sash windows, from their historical significance to their functional advantages, guiding you through every step of the process. Whether restoring a heritage property or adding character to a new build, we are committed to finding the perfect style for your home.

Explore our portfolio for inspiration from recent projects.

Get a quote

Drop us a line to discuss your windows

This field is for validation purposes and should be left unchanged.
Drop files here or
Accepted file types: jpg, jpeg, png, pdf, Max. file size: 32 MB, Max. files: 6.
    Upload Images Of Your Windows

    Learn more about our Accoya sash windows in Richmond, TW9

    Richmond in southwest London, is renowned for its charming riverside setting. The area features a mix of period properties alongside modern developments. It is also known for Richmond Park, one of London’s largest royal parks, and its vibrant town centre.

    Upgrading sash windows with high-quality, energy-efficient replicas can significantly enhance the comfort, functionality, and charm of any property. Accoya wood, a revolutionary material, undergoes an advanced acetylation process, transforming it into an exceptionally durable and resilient choice for sash windows.

    Accoya is resistant to decay, rot, and insect damage and offers an extended lifespan, ensuring your windows remain beautiful and functional for years. Its outstanding dimensional stability guarantees smooth operation and reduces the risk of warping, even in challenging weather conditions.

    A standout benefit of Accoya is its low maintenance. Its reduced water absorption protects finishes, prolonging their life and reducing upkeep requirements. Accoya also excels in thermal insulation, contributing to improved energy efficiency and lower energy bills.

    Environmentally conscious homeowners will appreciate Accoya’s sustainability, as it combines the eco-friendly benefits of softwoods with the robustness of hardwoods. Certified C2C Gold represents a responsible choice for heritage preservation and environmental stewardship.

    A+ rated sliding sash window installation in Richmond-upon-Thames

    New sash windows are an excellent way to improve your home’s energy efficiency while maintaining its charm. The Energy Saving Trust estimates that upgrading from single to A-rated double-glazed windows in a typical semi-detached home can save approximately £195 annually on energy bills.

    This efficiency comes from the insulated air space between the glass panes, which minimises heat transfer by slowing convection and conduction. As a result, your home retains heat for longer, reducing the need for frequent heating and lowering energy costs.

    For homeowners looking to reduce their carbon footprint and save money, double glazing offers a practical and eco-friendly solution. Not only does it enhance thermal insulation, but it also adds comfort and value to your property, making it a wise investment for modern and heritage homes alike.

    Anne olive
    2 weeks ago
    I had 8 box sash windows replaced and chose London Box Sash Windows because they offered acoustic glass and coloured glass to match the originals. The work was done in 3 days and the job was difficult because the original windows & frames weren’t straight. The guys did a brilliant job and I am really pleased with the new windows. I wouldn’t hesitate to recommend the company.
    Clare Allen
    2 weeks ago
    What a fantastic company . Professional from start to finish . We have had wood sash windows replaced in our Victorian terrace house . The product and the work carried out was amazing – we are so happy with the result . From the sales team to the fitters, everything went smoothly and we now have beautiful, period appropriate wood sash windows. It was so worth the cost. We couldn’t be more pleased . Would highly recommend the London Box Sash window company.
    william morgan
    2 weeks ago
    Had new double glazed sash windows installed on one floor and came back to them for another floor a year later. A friendly and knowledgeable team, great product and professional service.
    Louisa Ellis
    3 weeks ago
    We could not be more pleased with the service we received from London Box Sash Windows. The process from start to finish was very easy from Jake who came to quote, Judith in the office and Andy who came to install were super helpful. The windows are great quality and Andy did a fantastic job, we have rather a "drunk" Victorian house, our bathroom ceiling in particular, Andy has done such a good job, it looks amazing. He was also very clean and tidy. A huge thank you to Jake, Judith and Andy
    Richard Willmott
    2 months ago
    Had this company in to fit a window in our bathroom. Communication was excellent and the fitting was done quickly and with very little mess. We were very extremely pleased with the results. Would thoroughly recommend
    Leo Llewellyn
    2 months ago
    10/10 service and customer experience Bernie did my shutters last week, outstanding job at a good pricd
    Loraine Leeson
    3 months ago
    London Box Sash replaced all the sash windows at the front of my Victorian house including a dormer, and a kitchen casement window. Every aspect of this company’s service was friendly, efficient and highly professional. The windows themselves are perfect with a 50 year guarantee and the fitters were extremely competent and completed the task very quickly. They also took exacting care not to leave any mess, building a floor to ceiling screen around all the work and covering every inch of floor. I was particularly impressed with the initial survey, where my needs were listened to so that what was installed exactly met my requirements. I chose the company’s ‘standby’ offer since I wanted the work done fairly quickly, and they were accommodating enough to fit it within the dates I could do. The customer service was also everything I could ask for, and when a blind couldn’t be refitted and there was a problem with rehanging a curtain rail, I was compensated. It was one of the higher quotes I received, but completely worth it, and the standby reduction made a difference. I can’t recommend too highly.
    Rebecca Wood
    5 months ago
    We asked Simon to come and quote for replacing 6 tired windows – 3 casement and 3 sash windows. Simon arrived on time and was very polite. What impressed me most was his honesty and integrity. He asked how long we intended to stay in our home and he did a thorough review of the condition of our windows and then said, we would be better off just repairing them. In this day and age it's rare to find someone not trying to force sell things to you. Chapeau. Rest assured we will use this company in the future when we do need to replace our existing windows.

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

    Factories and showroom image

    Get a quote for sash windows or casement window installation in Richmond-upon-Thames today

    Please call 020 8648 4230 or email info@londonboxsash.com for replacement sash windows near you.

    Learn more about our sash windows Fulham.