Double Glazed Sash Windows Header


In addition to being energy efficient during the winter, did you know that traditional, double hung timber sash windows can provide excellent ventilation during the summer months?

Our replacement, double glazed, timber sash windows are designed to improve energy efficiency while complementing your period home.

We can replicate any traditional sliding sash window design, including Victorian sash windows, Edwardian sliding sash windows and traditional Georgian sash windows.Which? Trusted Trader

Where necessary, our wooden sliding sash windows can also be manufactured to adhere to listed building and Conservation Area requirements.

Traditional Timber Sash Window Company

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

Established in 1994, we have 30 years experience manufacturing and installing replacement sash windows in London and the South of England. We also offer a supply only service nationwide.

We are an award winning company and are proud to be Which? Trusted Traders, highlighting the high quality of both our timber windows and our customer service.

As sash window specialists, with extensive experience working across London and the South, we have designed our Classic range designed to cover the sash window requirements for Georgian, Edwardian and Victorian homes.

We can replace both box sash windows and sash window bays.  We have experience working with both cord-hung timber sash windows and spiral balance timber sash windows.

Obtain a quote for your sliding sash windows.

bespoke sliding sash windows London
Accoya bay sash window

High Quality Replacement Timber Sash Windows

The Sash Window Workshop specialise 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.

If you have specific design in mind, we can manufacture bespoke, replacement double glazed sash windows that retain the feel of your period home.  If you are unable to have double glazed sash windows, we can also manufacture and install single glazed timber sash windows when required.

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 prefer.

Our new windows come fully factory painted (with three coats) in white, as standard.  However, if you would like a specific colour we can also colour match to different paint finishes.

If required, customers can opt for special glazing such as stained glass, obscured glass and bowed glass.  We also offer a range of ironmongery options for your new sash windows.

New Timber Sash Windows Quotation

When you make an enquiry, you will be assigned to one of our experienced sales surveyors who will be able to answer any questions that you have.

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 or delivery date. If you are having windows supplied and installed, our new wooden sash windows will then be fitted by our expert installers.

Obtain a quote for your sliding sash windows.

Timber window and door manufacturer
Double Hung Sash Windows

Timber Box Sash Windows London and Southern England

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 balance 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 any listed building or conservation area requirements for wooden sash windows in London and Southern England.

Energy Efficient Timber 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.

At The Sash Window Workshop, our new 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 restrictions, we are also able to manufacture replacement single glazed wooden sash windows or use heritage double glazing, which uses a narrow profile meaning that it is more likely to be approved by planners.

If we are installing replacement sash windows in London and the South of England, we will also draught proof the windows on installation, helping to keep your home warm during the winter months.

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

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

Our Replacement Timber Sash Window Guarantees



Accoya Anti-Rot






Double Glazing






Draught Proof

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