01753 858196 info@boxsash.com

Sash Windows

As London’s original box sash window company, we have spent over 40 years delighting our customers with beautiful bespoke sash windows.

Built to last, our windows are made using traditional joinery methods and only the finest materials, creating a stunning finish for your home.

Hand-crafted from premium quality solid African hardwood, our sash windows capture the charm and authenticity of period windows while offering exceptional levels of comfort, security and performance.


 We make all our own glazing units to ensure maximum insulation and sound proofing properties. Double glazed safety glass as standard, in fact we were the first to develop double glazed sash windows.

We can also tailor the glazing to your exact requirements – incorporating other glazing styles and specifications such as toughened and laminated glass, acoustic glass, and textured, obscured or stained glass.



All of our traditional timber windows feature authentic mouldings that will perfectly complement your property. Our internal mouldings are created bespoke to match the original mouldings in your home, while outside detailing such as glazing bars and horns are matched to existing features.

We can also finish our windows in your preferred colour. Just quote us your chosen paint and reference and we will make an exterior quality paint to match. 

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Key Benefits


Crafted from the highest quality prime African hardwood, our windows and doors offer a range of unparralleled beauty and performance with lifetime guarantees.


Our windows and doors are double glazed with safety glass, and come with a premium quality locking system for your complete peace of mind.

Low Maintenance

Our beautiful traditional timber windows require minimal care and attention to keep them looking and working in premium condition for a lifetime.


We use seasoned prime natural African hardwood from Forestry Stewardship Council certified sustainable sources, combining elegance with environmental responsibility.

Lifetime Guarantee

For complete peace of mind, our superior quality timber windows come with a lifetime parts guarantee, all insured by the Independent Warranty Association. Glazing units come with a 10 year guarantee. .


Featuring classic mouldings, traditional timber horns, and counter-balance, pulley and cord systems, our inidvidually crafted windows and doors deliver a truly authentic feel.


Our products are finished with a high quality micorporus paint,  offering optimum, long-term resistance to the elements and easy maintenance.


Combining style and performance, our windows and doors are designed for maximum comfort and sealed against draughts, damp air, noise pollution and dust.

Energy Efficiency

A traditional product does not mean compromising on modern performance. Our flush sealed Argon filled windows prevent heat loss, helping you lower your energy bills. Beauty and performance combined.

The Original Box Sash Windows Company

The Joinery
29-30 The Arches
Alma Road

01753 858196