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.

Olivia Fothergill

Absolutely fabulous service from start to finish. Top notch communication and friendly too! Andy did our sash windows for us and left the house in spotless condition and did an incredible job. We are thrilled with the results

marie Chiron

Living abroad presently, no regret having London Box Sash window replacing eight old windows with double glazed ones including two leaded windows. My initial contact, Jake, makes me at ease with the process. Judith who presented the quote, had it very well explained. Harry who is in charge of organising the actual work, upon inspection of my flat, gave me an initial details situation on potential problems i.e position of radiators, sink, gas meter etc, however worked around those problems with the engineer. Harry’s honesty was appreciated. The team of installers managed by Harry was equally good. My tenants are very happy with those new windows, they can feel the difference in temperature. From the video received, I am impressed with the end product. Would recommend London Box Sash Windows to friends and neighbours. London box sash window is a company you can trust.

Jason Ward

Excellent service throughout. High quality window. Prior survey very straight forward. Actual installation highly professional – clean workmanship, tidy and efficient. Very impressed and highly recommended.

Benjamin Cloue

Amazing experience and strongly recommend London Box Sash!From quoting with Jake, surveying with Harry, fitting with David and contract discussions with Judith, the whole team has been fantastic and provided a great customer experience.The team was always punctual and the fitting was done very fast and super clean (thank you David!).

Irena Stanwell

It is my second time I am using London Box Sash Windows replacement service. I was first of all pleased to learn that the same people were still working in the company and it was a pleasure to deal with the team who I still remembered since my first interaction with the company few year back.The performance of the LBSW was outstanding from the beginning to the end, punctual, knowledgeable, friendly and very professional. Explained all options etc and the performance on the day was seamlessWould highly recommend with no reservations..

Louise Norman

I am very satisfied with both the products and service provided by London Box Sash Windows. I was reassured by Murray’s knowledge and experience and he was helpful and patient when I was working out what I wanted. He listened, and there was no “hard sell”. Harry did the survey and Anjelo and Rafal the installation. They were all punctual and courteous. The installation was carried out quickly and efficiently, and Anjelo and Rafal took care with my property and tidied up after themselves. The aftersales care provided by Murray was excellent. Nothing seemed to be too much trouble. Having windows replaced is not a cheap option and involves a fair amount of upheaval, but I felt throughout the process that I could trust LBSW to provide value for money and make it as smooth as possible. I am very pleased with the end result. My new bay window looks great and is totally in keeping with the period of my property, including the “swept” heads. I immediately started to feel the benefits of having double-glazing in terms of heat retention, no draughts and noise reduction. I will also benefit from the improved security and low maintenance it offers. I would not hesitate to recommend London Box Sash Windows.

Fritha Hookway

So happy with the whole experience with London Box Sash. Our new windows look amazing. The whole process was very thorough, competitive in price and really quick for install – which was a nice surprise as the lead time was halved from what we’d thought it might be. The team were also exceptionally helpful when one of the old windows were were planning to replace was severely damaged during a storm. They came to board it up free of charge in the interim while the new one was still being built. Simon in particular was really helpful – a huge thank you to the whole team.

Joe Philp

A fantastic job. The end result is brilliant and a big improvement in terms of sound and thermal insulation. The team went above and beyond, taking time to understand our requirements and coming up with creative solutions. They were helpful and responsive throughout the process and the job was done quickly, carefully and meticulously – despite a last-minute adjustment that had to be made during the replacement. We felt in very safe hands and trusted the team completely – I wouldn’t hesitate to recommend.

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.