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Leading company for sash windows Lewisham

A-rated sash windows and Accoya sash windows for energy saving and aesthetics in Lewisham, Hither Green, or nearby areas

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London Box Sash Windows is a local, trusted, family-run business with over four decades of experience providing top-quality timber sash and casement windows throughout the London area. Every project is executed with care, ensuring your satisfaction at every step.

We specialise in crafting and installing traditional timber sash and casement windows. We prioritise energy efficiency while maintaining your property’s architectural charm and kerb appeal. Our windows are made from Accoya wood, which is also energy efficient and will save you money on fuel bills.

From designing and crafting bespoke sash windows to expert installation and ongoing replacement services, our specialists handle every aspect of your sash window needs. With a commitment to quality and attention to detail, London Box Sash Windows ensures your home retains its character while benefiting from modern efficiency and craftsmanship you can rely on.

Our dedicated and skilled team takes pride in delivering a helpful, reliable, and professional service you can trust. Whether installing new sash windows or replacing existing ones, we offer customised solutions tailored to your needs at competitive prices.

We take great pride in our trusted relationships with our clients. One recent customer said:

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 fitting 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!

Get a sash window quote now by calling 020 8648 4230.

Hither Green Exceptional replacement sliding sash windows & box sash windows installed near you

At London Box Sash Windows, each product is made to order and installed by our in-house specialists. To ensure your satisfaction, all sash window and casement window installations come with a full guarantee, giving you confidence in the durability and quality of our work.

We provide personalised, detailed quotations for every project and are always available to answer your questions. All replacement box sash windows are custom-made and handcrafted, ensuring an authentic and precise reproduction tailored to your home’s needs.

For examples of our recent sash window installations, explore our portfolio.

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    Why opt for Accoya sliding sash windows in Lewisham, SE13

    Lewisham in South East London is known for its diverse mix of architectural styles. The area features Victorian and Edwardian terraced houses with ornate sash windows and post-war housing developments that add to its varied character. Modern apartment complexes and regenerated spaces are becoming increasingly common, blending contemporary design with the area’s historic charm. Our sliding sash windows can be designed to match properties of all styles and descriptions.

    Accoya wood is an engineered timber treated with a patented acetylation process. This process enhances its natural properties to deliver exceptional durability, stability, and resistance to decay. These features make it ideal for modern replica replacement sash windows, blending traditional aesthetics with advanced performance.

    Accoya’s durability ensures a lifespan of over 50 years above ground, far surpassing untreated timber and many hardwoods. This makes it highly reliable for external applications. Its dimensional stability prevents swelling, shrinking, or warping.

    Accoya’s excellent thermal efficiency improves insulation, reducing energy loss and heating costs. Sourced from FSC®-certified forests and 100% recyclable, Accoya is an eco-friendly choice for sustainability-focused homeowners.

    Please see our blog: Maintaining sash windows: Tips for London homeowners.

    Lewisham sash window installation: What makes our company special?

    Since 1980, London Box Sash Windows has crafted high-quality sash windows that are close to our customers. By installing 95 per cent of our windows within 10 miles of our London workshop, we minimise our environmental impact, reduce carbon emissions, and support local businesses and communities.

    Our London workshop specialises in restoring, repairing, and creating sash windows, blending timeless elegance with modern functionality. Located centrally, it serves as a hub for homeowners, professionals, and sash window enthusiasts, offering expert craftsmanship and personalised service to preserve the charm and character of every property.

    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:-

    • Cubitt Town
    • Deptford
    • Forest Hill
    • Greenwich
    • Kidbrooke
    • Lewisham
    • Millwall
    • New Cross
    • Poplar
    • Shooters Hill
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    Would you like a sash windows consultation in Lewisham? Call now

    Our sash windows team is here to take your call. Please call 020 8648 4230 or email info@londonboxsash.com.

    Do you need sash windows Kingston? Call our local specialists today.