Box Sash has been an industry leader in traditional timber windows and doors for more than 30 years. Our success is due not only to the quality of our products, but the quality of our customer service, which centres on honesty, transparency, integrity and reliability. Once your windows have been installed, our dedicated customer care team is on hand to advise and assist on any aftercare issues you might have.


Lifetime Guarantee

Our premium quality traditional timber windows are designed to last a lifetime with minimal care and maintenance. If any of the parts on the windows or doors you have purchased from us should need replacing during your lifetime, we will supply these free of charge. We store details of your installation on our files, enabling us to source and replace parts quickly, and ensuring quick, hassle-free service for you.

Lifetime Guarantee Registration

We want you to be 100% satisfied with the beautiful traditional timber windows and doors we supply. We offer a comprehensive free adjustment service for 12 months post installation to ensure that your new windows and doors fit perfectly and problem-free within your home. For your complete peace of mind, our free service and parts guarantees are insured and underwritten by Elite Insurance of London at no cost to you.

Register your Lifetime Guarantee


Transfer of Lifetime Guarantee

Our beautiful bespoke windows and traditional timber doors are an asset to any character, period or historic property. If you decide to move homes after having our windows and doors installed, your lifetime guarantee can be transferred to the new owner of your property, helping you to maximise the value our products represent. Contact a member of our customer care team and we will be happy to make arrangements.

Transfer your Lifetime Guarantee