01753 858196 info@boxsash.com

We design and manufacture the most elegant timber windows and doors in the UK.


Known for our incredible craftsmanship, we are proud to help our customers achieve beautiful, warmer, quieter and more secure homes.

Handcrafting the best windows and doors for over 40 years using traditional joinery methods, we will not compromise on quality. Hence all our products are made from solid hardwood timber to ensure they perform perfectly for a lifetime.

Leading the industry with such innovations as creating the double glazed sash window (patent relaxed), where we have led – others have followed.

Highest Quality and Service delivered through

A company that places quality at the heart of its operation

Unrivalled skills and experience from a dedicated workforce - some with 20 and 30 years service

The best materials - solid hardwood FSC certified

Glazing handmade to achieve the best performing units for sound deadening, insulation purposes and security

Caring customer service and installation team

HIGHLY experienced

Why choose The Original Box Sash Windows Company?

The original box sash window company established in London (hence the name), came from a passion to see period homes maintained to the highest standards. You won’t find a manufacturer who will care more about creating the perfect windows and doors for your home than us. Many of our expert joiners, glaziers and painters have been with the company for ten, twenty and even thirty years, such is the love for their craft.

Lifetime guarantee

All our frames have a lifetime guarantee and come insured by the Independent Warranty Association (and all glazing units come with a 10-year guarantee too), so you can have total confidence in our products.

Beauty and grace

We study the original detailing at your home and create mouldings and outside features to match perfectly, so you will uphold the heritage of your property and it will look again as elegant as it did the day your home was finished.

Maximum energy efficiency

We make the double glazed units ourselves, flush-sealed and Argon-filled to deliver maximum insulation and sound proofing, so you can lower your energy bills without ever compromising on authenticity.

Superb security

Your sash windows will be fitted with your choice of multipoint locking mechanisms; from traditional deadlocks to mortice sash-locks and night-latches.

Long-lasting and low maintenance

Your windows and doors will be finished with high quality microporous paint, for durable, long-term resistance to the elements and easy maintenance. 

Sustainable timber

The exceptional performing hardwood timber we choose, comes from Forestry Stewardship Council certified sustainable sources. 

The Original Box Sash Windows Company

The Joinery
29-30 The Arches
Alma Road

01753 858196