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

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.

Andra Chira

I had a great experience with this window sash company. The online quote tool was quick and easy, and they followed up promptly after my enquiry. They had availability to visit soon after, and Simon, who came round, was excellent – professional, clear, and really knowledgeable. I found the whole visit very informative.Although I couldn’t go ahead with the project due to a change in circumstances, the experience was excellent from start to finish. When I’m ready to pick it back up, I’ll be coming straight back to this team.

Daniel Hills

Very happy with the service we received from London Box Sash. Excellent quality windows, reliable communication and they even helped us through the lengthy planning permission process. Would recommend!

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.

Bev Roberts

Once again an excellent experience from start to finish !If only every company was as brilliant as London Box Sash Windows .i will definitely be coming back to get the rest of my windows replaced by them

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!).

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

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.