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

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.

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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.

Lottie Birmingham

I recently had a new sash window fitted in my living room and London Box Sash could not have been more helpful.Jake was absolutely brilliant and talked me through all the options and helped me choose what was right for me. The ordering process was simple and the fiting was carried out in one day and I am so happy with the finish.Would definitely recommend – the care and attention to detail is wonderful.Thank you!

Emma V

Thrilled with our 3 new box sash windows. The quality of the windows is excellent and worth every penny. I thought the price was very fair compared to other quotes I received given the quality of the wood that is used, the length of the guarantees and the ease of the company to deal with. The process from start to end has been seamless. Everyone we interacted with was superbly knowledgeable, responsive and helpful – from Harry, the sales person who helped explain all the design considerations and options very clearly, Judith in the office helping getting us booked in and Andy, the fitter. Andy consulted us on any bits where needed explaining clearly the decision that was needed and his work was to an excellent standard and he was very clean and tidy and respectful of our home. He also kindly made the suggestion to ask our decorator to angle the external sills as they were flat so that the water runs off which would help avoid any damp issues and improve longevity. His wealth of experience was very obvious and I was grateful for him sharing these pointers and discussing directly with my decorator – it’s something that would never have crossed my mind without his tip. I thoroughly recommend!

Robert Purdew

Can’t recommend enough.The windows installed seem like they’re a really high quality product. Very good customer service from end to end. They do a really thorough consultation & respond quickly to calls and emails. The day of the installation was easy and the guys who installed were quick and left no dust or mess. Followed up at the end via text, email and a call to check I was happy with the product – highly rate this approach.

Christine Haight

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.Christine Haight

Judy Carlisle

Both salesman and surveyor were straightforward, helpful and answered all questions.Installers were very efficient, worked very hard, cleaning thoroughly.Astonishingly job completed in 6 hours.The only failing was forgetting to move a chest of drawers.Judith was friendly, very helpful and reassuring

Doxy

We are delighted with our new windows. From our initial enquiry onwards everything was dealt with in a thoroughly professional, efficient and respectful way. A special mention of Andy, our fitter, whose craftsmanship and attention to detail was amazing.

Tasha Spencer

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!

Nicholas Black

Can only recommend! Everything went extremely smoothly. The team were always available to answer any questions and walk us through the entire process to get our new window installed. Also very competitively priced.I will be reaching out to them soon to get other slash windows replaced.

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

Kingston Upon Thames
Strawberry Hill
Twickenham
Whitton

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.