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Each double glazed, timber sash window replacement that we manufacture and install across London and the South is bespoke.

Established in 1994, we have extensive experience working within London and the South of England and can replicate any traditional sliding sash window design. Where necessary, our wooden sliding sash windows can be manufactured to adhere to listed building and conservation area requirements.

Bespoke Timber Sash Window Company

Our timber box sash windows are manufactured by our skilled craftsmen in our workshops in Berkshire and come fully factory finished.

From our extensive experience working in period properties across London and the South, we have designed our Classic range which covers most requirements for Georgian, Edwardian and Victorian homes.

However, if you have specific design in mind, we can manufacture bespoke replacement double glazed sash windows that retain the feel of your period home.

Bespoke wooden sash windows
Accoya bay sash window


The Sash Window Workshop are specialists in the replacement of traditional timber sash windows in period properties.

We offer a supply and fit service across London and the South, with a supply only service nationwide.

The majority of our new timber sash windows are made in Accoya™, a sustainably sourced modified wood that comes with a 50 year anti-rot guarantee. We can also make windows in alternative hardwood timbers if you would prefer.

If required, customers can opt for special glazing such as stained glass, obscured glass and bowed glass. We also offer a choice of different paint finishes and ironmongery options for you new sash windows.

New Wooden Sash Windows: Our Process

When you make an enquiry, you will be assigned to one of our experienced sales surveyors. They will be able to answer any questions you have and help identify the right solution for you.

If you wish to proceed, you will need to send the signed paperwork to us with the deposit. You will then have a manufacturing survey, when measurements are double checked before manufacturing starts.

During manufacturing we will contact you to arrange an installation date. Your new wooden sash windows will then be installed by our expert installers.

On completion, if you are available, our fitter will check that you are happy and will provide you with a satisfaction form.

Timber sliding sash windows London

To view examples of our previous work, view our gallery pages.

Energy Efficient Traditional Sash Windows

When looking to replace timber sash windows it is important to ensure that the new sash windows are as energy efficient as possible. Therefore at The Sash Window Workshop, all our timber windows are manufactured to provide the modern benefits of double glazing, while preserving the character of your home. If you are unable to install double glazing, due to planning requirements, we are also able to manufacture replacement single glazed wooden sash windows.

Our replacement sash windows in London and the South of England are also draught proofed on installation to help keep your home warm during the winter months.

Traditional Wooden Box Sash Windows London

Did you know that the traditional box sash window has been around since the 17th century? Amazingly the cord and lead weight design remains almost unchanged with spiral hung sash windows being a more modern development.

Victorian timber sash windows are a key architectural feature in a number of areas around London including Kensington, Islington and Hampstead.  Conservationists are keen to retain the heritage features.  At The Sash Window Workshop we are able to ensure that the patterns and designs are precisely copied to comply with listed buildings and conservation area requirements for sash windows in London.

In addition to complete new wooden sash windows, we can also manufacture and install new sashes into the existing window frames, alongside complete new casement windows and external timber doors.  If your windows don’t require replacement, we also offer a draught proofing and overhaul service for timber windows.



Accoya Anti-Rot




Double Glazing




Draught Proof

*Maximum Guarantees Shown. Please see our Guarantee and Maintenance documents for further information.