Wooden casement windows


We manufacture and install replacement wooden windows across London and the South. We also provide a supply only service nationwide.

Which? Trusted Trader of the Month Nov 2021

All our replacement timber casement windows are manufactured in our workshops in Berkshire. Depending on your requirements, we can replicate many different design configurations for wooden casement windows. We also have a Classic Range which covers most period design requirements.

Timber casement window styles

We can manufacture and install a wide range of wooden casement window styles to suit your period property. We offer double glazing as standard. For listed buildings, we can manufacture single glazed casement windows.

Timber flush casement windows are a more traditional design compared to stormproof casement windows.

Flush casement windows sit flush within the frame, creating a flat surface on the outside. Stormproof casement windows (also known as lipped casement windows) overlap the window frame when closed.

In contrast, stormproof casement windows(sometimes referred to as lipped casement windows) overlap the window frame when closed.

We are also able to replace casement sashes (the moving parts of the timber casement window) if the frames are still in a good condition.

Replacement Timber Windows
New Timber Windows Kitchen

Timber Casement Windows in Period Properties

At The Sash Window Workshop all our replacement timber windows are designed to add charm and character and be in keeping with your home, while providing modern benefits such as double glazing and soundproofing.

We can manufacture casement windows to suit a range of period properties, including Edwardian, Victorian and Georgian homes. We also have extensive experience working in Conservation Areas and listed buildings across London and Southern England.

If your windows are in a good condition we can repair the existing window by carrying out our draught proof and overhaul service.

Where We Install Casement Windows

We offer an installation service for new timber windows in properties in the following counties:

London, Berkshire, Hampshire, Surrey, Oxfordshire, Hertfordshire, Buckinghamshire, Wiltshire, Essex, Kent, West Sussex, East Sussex, Bedfordshire, as well as parts of Gloucestershire.

If your property outside our installation area, or if you already have a company to install the windows for you, we also offer a supply only service across Great Britain.

bespoke wooden casement windows
London Timber Windows

Made in Britain

We are proud to manufacture all our wooden casement windows in our workshops in Berkshire. We use the latest technology alongside the skill of our expert craftsmen.

All our new timber windows are bespoke, manufactured to meet our customer’s design requirements.

We understand the importance of using ironmongery that is elegant and secure, providing a high level of security for your home.

Our casement windows come fully factory finished.  We offer a wide range of glazing, ironmongery and paint / stain finish options to suit your requirements.

High Quality Materials

The materials that we use are of the highest quality. Our years of experience and knowledge ensure we use only the best and most durable materials, providing you with a high quality performance window.

We are FENSA registered and FSC® Certified.  We are proud to be Which? Trusted Traders, highlighting the high quality of our product and service.

Our replacement casement windows are manufactured in Accoya as standard. Accoya is a durable, sustainably sourced modified wood, which comes with a 50 year anti-rot guarantee.  We can also manufacture using other hardwood timbers, when required.

Double Glazed Timber 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 casement windows are glazed in accordance with Building Regulations and the relevant BS standards (EN 1279) to offer the best energy efficiency. We can work with a variety of different glass types to suit your specific needs.

We also offer other replacement products, including wooden sash windows and external timber doors, such as French doors, front doors and sliding and bi-fold doors.



Accoya Anti-Rot




Double Glazing




Draught Proof

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