Our Windows

Learn about our quality sash windows, casement windows and french doors

LBS is London’s leading sash window and door manufacturer. We have a proud history of over 40 years, and our loyal customer base is testament to our commitment to quality and customer service.

We offer a wide range of sash windows, casement windows, and French doors to suit every home. Our windows are made from the finest timber and are fitted to the highest standards. 

We are a family-run business, and we are passionate about providing our customers with the best possible service. We are always listening to our customers’ feedback, and we are constantly innovating to improve our products and services.

We are committed to providing our customers with the very best timber windows and doors. Find out more below

Sash Windows London - Timber Sash Windows manufactured and installed for a customer in Herne Hill, London
Double Box-01
Top SAsh-01

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The Sash


Thermal insulating while warmedge Swisspacer bar. Helps detract from the fact it’s double-glazed.

Traditional horn details to match period design.

Drained and vented rebates allow any trapped moisture to escape through small concealed holes, prolonging the life of the double-glazed units.


High-performance ball bearing pulley wheels and sashes hung with pre-stretched nylon sash cord which can take 500kg of weight.

21mm slimline ovolo glazing bar detail.

Additional security through limit stops installed to allow for secure ventallation.

Premium lockable fitch fastners.

Premium sash lifts.

Accoya Wood

Known for its exceptional durability and stability. Resistant to rot, decay, and insects, Accoya wood is also a sustainable choice with low environmental impact. Made from non-toxic, sustainably sourced materials and with a very long lifespan, Accoya wood is the perfect choice for windows and doors

Glass & Glazing

At London Box Sash Windows, we take pride in crafting only the finest double-glazed units. Made in house, ensuring the highest level of quality and performance in every unit we produce


Sash windows, finished with the latest low-maintenance paint systems and state-of-the-art drying technology for a flawless, long-lasting finish.

Sash WindowsAt London Box Sash Windows, we have been perfecting the design of our sash windows for over 40 years, continuously making improvements to both the aesthetic and performance aspects. We are proud to offer a product that has been honed and refined through years of research and development, ensuring that our customers receive the highest quality and most advanced sash windows on the market.Casement WindowsAt London Box Sash Windows, we’ve honed our expertise in bespoke casement windows through years of customer collaboration and technological advancements. Our windows are among the most high-performing on the market, offering unbeatable thermal efficiency. Yet, we remain dedicated to preserving the classic heritage of the casement window design. That’s why our range features precise, flush-line finishes that add character to your property. Whether you’re looking for traditional or modern designs, we have bespoke casement window options to fit your unique needs.French DoorsExperience authentic style with our handcrafted timber French doors. Choose from traditional or contemporary designs, tailored to your exact specifications. Our doors feature double-glazing to A-rated specs and advanced microporous paint for ultimate insulation and durability. Trust in our expert installation for a fully completed and high-performing door solution.

Extreme Stability

70% to 80% reduction
in swelling & shrinkage

Low Maintenance

Paint finish that lasts
3-4 times longer

Robust Construction

Mortice & tenon
joints used


Traditional features sympathetically replicated

High Performance

A-rated double-glazed units

Naturally Insulating

Improved thermal insulation


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Proud supportes of –
One Tree Planted

We’re passionate about sustainability and protecting the environment – after all, without the timber provided by Mother Nature our business would have never started.

That’s why all our products are locally manufactured and we’re proud supporters of One Product, One Tree Planted; a charity dedicated to forestry projects around the world.We’ve pledged to plant at least one tree for every door or window we sell, and we’re on a mission to plant 30,000 over the next decade.

One Tree Planted “As an environmental charity, we are dedicated to making it easier for individuals and businesses to give back to the environment, create a healthier climate, protect biodiversity and help reforestation efforts around the world.”

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