The Capital Sash Company

The Capital Sash Company is a wholly owned subsidiary division of The 1st Group supplying and installing traditional box sash type windows as well as, where appropriate, modern alternatives. Specialising in this field since 1984, we have successfully completed well over 10,000 installations comprising the supply of more than 75,000 replacement windows.

Since 1998 we also supply and install bespoke Hardwood Casement Windows, Doors & Conservatories.

We pride ourselves on our levels of Customer service; paying attention to detail, quality and value for money. When dealing with us, you will be treated with courtesy, professionalism and respect.

This site is not intended to be an exhaustive or exhausting experience! It is designed with the intention of providing owners of period properties incorporating Box Sash Windows and those seeking quality timber Windows, Doors and Conservatories with the information that they will need when considering replacement options.

Having browsed our site please feel free to telephone us with any questions that you may have. You will find that all of our staff are professional, helpful and well informed.