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Where Tradition Meets Performance

London Box Sash Windows is London’s leading premium manufacturer and installer of traditional timber sash windows and doors. Operating out of our factory in southwest London, our product range includes sash windows, casement windows, doors and a varied amount of bespoke commissions. With more than 30 years as a family owned and run company, we understand our customers’ needs.

That’s why we produce a quality product with a high level of customer service every time. Our goal at London Box Sash Windows is to meet targets on price, quality and service. Together with our dedicated team, we are committed to continuously improving and innovating our product, so our customers always get the best possible experience.

Our Products - Sash Windows

The ’50-Year Sash Window’ is our premium option. With longevity and performance being the key factors, we combine traditional joinery methods with high performance double-glazing, draught sealing and the finest quality low maintenance micro-porous paint system, ensuring optimum durability.

Our Products - Casement Windows

Years of our customers’ feedback and advances in technology have helped us develop our bespoke 50-Year casement window into one of the highest performing on the market. While we wanted to make our windows very thermally efficient, we also wanted to stay true to the heritage the casement window has.

Our Products - French Doors

Our French doors have been designed to exceed industry standards in performance, insulation, security and finish, whilst maintaining all of their original features. The range is fully bespoke and can be customised to suit your specific design requirements, with the option of different moulding and glazing bar configuration.