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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
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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.

    Dieter Gatzke
    Had a couple of beautiful new sash windows installed in summer of 2024 by London Box Sash Windows Ltd. At the time we were (and still are delighted with their work.
    When we needed a new made to measure balcony door in June 2025, for obvious reasons London Box Sash Windows Ltd was our first port of call. We gathered a couple of quotes from specialised door installation companies but found that the price difference was marginal compared with what London Box Sash Windows Ltd quoted us.
    So we went with ‘the devil we knew’
    The experience from start to finish was s great as before. From the first visit by Jake to the post installation follow-up call by Judith everything worked extremely well again.
    The door looks and feels solid and is made to look like the original door (first installed in 1905), including double glazing in 3 different colours across the 9 glass segments.
    If you after a cheap job, don’t use London Box Sash Windows Ltd – they are not cheap. But for your money you get an outstanding product, expertly installed and with full warranty.
    Without hesitation, I will recommend London Box Sash Windows Ltd to friends and neighbours.
    Steven Munro
    The new windows have completely transformed the feel of the house — quieter, warmer, and just better. We chose London Box Sash Windows after being impressed with the quality and price during the initial quote. The installation experience was smooth, and I can’t recall any issues, so I’d rate it a solid 10. Jake, who came to survey our home, was particularly knowledgeable and left a great impression. Overall, I would definitely recommend.
    Jane Sparrow
    This is the second time I have purchased windows from London Box Sash and both times the experience has been excellent. From the initial appointment, to timing of the quote, survey, communication from the office and finally the installation, everything was handled efficiently and professionally by all the people I interacted with. The installer completed the job a day ahead of schedule and left everything tidy. The quality of the windows is outstanding, and I would happily recommend them to friends and neighbours.
    Charlotte Gillespie
    Really impressed with how professional and tidy the team was. Raf and Angelo did an outstanding job during the installation; they were incredibly polite and efficient, making the whole process smooth and hassle-free. I would definitely recommend London Box Sash Windows to anyone looking for reliable and high-quality window installations!

    Many thanks,

    Jack
    London Box Sash Windows
    Philip Honer
    Superb! From beginning to end. Communication is unusally good and the process seamless. Product is fantastic
    R Edwards
    The whole process felt simple, well organised, and stress-free, which was ideal during a loft conversion. London Box Sash found an install date extremely fast which meant we could make the building water-tight quicker than expected. We have used London Box Sash before, but I was still impressed by the quality of the windows, and the price for accoya wood as well. They’ve made a big difference in insulation and noise reduction. I would highly recommend London Box Sash Windows to anyone looking for a reliable service.
    michael cronin
    What stood out most was the care and attention to detail. From the moment we made our initial inquiry, the whole process was seamless and stress-free. Andy, in particular, was an absolute gem—his efficiency and friendliness made a real difference. The quality of the windows is superb, and we couldn’t be happier with the installation. We would wholeheartedly recommend London Box Sash Windows to anyone looking for new windows!
    Michael Glynn
    We followed our very successful window renewal with one more that needed doing. Naturally, we choose London Box Sash Windows again, and they fully lived up to our excellent previous experience. Just one man did the whole thing, on time, quietly, very thoroughly and with no mess left at all. In fact you would not know he had been, apart from a brilliant new window manufactured and fitted to the highest possible standards,

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

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    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.