Crafting bespoke windows for over 40 years

London Box Sash is a family business grounded in traditional values and a genuine passion for quality craftsmanship and joinery.

Expertly Handcrafting Sash Windows in London for Over 40 years

London Box Sash Windows is a family run business specialising in high-quality timber sash windows in London. We are committed to providing our customers with exceptional products and service, with a reputation for craftsmanship and quality.

For over four decades, we have been handcrafting custom-made double-glazed sash windows to meet the specific needs of our customers. Our skilled artisans use only the finest materials and our windows are built to the highest standards.

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This image shows the London skyline, with timber sash windows installed in some of the buildings. London Box Sash Windows is a company that specialises in the installation of timber sash windows in London. The company has a team of experienced and qualified installers who can provide a high-quality service.

Family owned

From humble beginnings it all started with a wall

Engineer John Ellis founded our company in 1980 with a passion for woodwork. He used his knowledge and experience to create high-quality double-glazed timber sash windows and doors. We have grown over the years, but we remain committed to the same high standards of excellence.

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John Ellis, Founder of London Box Sash Windows, installs a sash window. John Ellis is a skilled craftsman with over 20 years of experience in the window installation industry. He is passionate about providing his customers with high-quality windows that are both energy-efficient and stylish

Locally made

A craftsman sands a timber Accoya sash window in London. Accoya is a sustainable wood alternative that is resistant to rot, decay, and insect damage. This makes it an ideal material for windows in high-traffic areas, such as London. The craftsman is using a makita belt sander to smooth the surface of the window before it is painted or stained.

Timber Windows & Doors Locally made in London

London Box Sash Windows has been making sash windows in London since 1980. We reduce our environmental impact by installing 95% of our sash windows within 10 miles of our workshop. This helps to reduce our carbon emissions and traffic congestion, and it also supports local businesses and communities.

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Bespoke windows

London’s Double-Glazed Sash Window Specialist

LBSW provides high-quality timber double-glazed sash windows in London. We commit to providing exceptional engineering and service to our customers. Our reputation for craftsmanship and quality is second to none.

We build our windows with the finest materials, so they are built to last. We offer a wide range of styles and finishes to choose from, so you can find the perfect window to match your home.

If you are looking for high-quality timber windows in London or Surrey, look no further than London Box Sash Windows. We are the experts in sash window installation and we are committed to providing our customers with the best possible experience.

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Sash Windows London - Timber Sash Windows manufactured and installed for a customer in Herne Hill, London

Our portfolio

Our Portfolio

Discover the quality and craftsmanship of LBSW – browse our timber window projects in London and surrounding areas.

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Width and height added together equal less than 2000mm
Width and height added together equal between 2000mm & 3000mm
Width and height added together equal more than 3000mm