Specialist manufacturer and installer of bespoke replacement timber windows and doors

At The Sash Window Workshop we manufacture all the bespoke joinery for our windows and doors in-house at our workshops in Berkshire, ensuring that our products are manufactured to the highest standards.


Our materials are selected to provide a high quality, beautiful product to suit your home. We recommend manufacturing your windows and doors in Accoya™ or hardwood, which has high durability and a longer life span.

For properties in London and Southern England, we can provide a supply and fit replacement service. We also provide a supply only service of new timber windows and doors across the UK. Established in 1994, we have extensive experience working in homes and commercial properties across London, Bedfordshire, Berkshire, Buckinghamshire, Essex, Hampshire, Hertfordshire, Kent, Oxfordshire, Sussex, Surrey and Wiltshire.


We offer a range of bespoke sash windows, including cord hung, spiral hung and fixed windows. The majority of our replacement wooden sash windows are double glazed, but we can also manufacture single glazed windows if required for listed building requirements.


All our replacement casement windows are bespoke and designed to be as energy efficient as possible. The majority of casement windows that we manufacture are double glazed, but we can also make single glazed windows if required for listed building requirements.


We manufacture and install a range of external timber doors, including front doors, single back doors, French doors, bi-fold doors and sliding doors. The majority of our new wooden doors are double glazed, but we can also manufacture single glazed doors if required.


Our secondary glazing service is popular in listed buildings, where double glazing may not be permitted. All our secondary glazing is bespoke and can be manufactured to match your existing windows.

Unsure what type of windows you have? Sash windows slide up and/or down to open, whereas casement windows open on hinges, like a door.
To view examples of our previous work, view our gallery pages.

New Sashes into Existing Window Frames

If your window frames are still in a good condition, but the moving parts require replacement, we can manufacture and install new sashes into the existing window frame. This is not only saves you money, but also minimises disruption to your home.