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I specialise in repairs and refurbishments, as well as providing and installing new replacement timber windows, which includes both casement windows and sash windows.

Not everyone knows the difference between the two so I have added a brief description below to help - and do also have a look at Sash Window Terminology for other key terms used in the trade.


Sash windows became widely used in the Georgian era, although they had been around before this period, and their popularity continued well into the Victorian times.

Generally sash windows consist of one or more panels known as sashes which slide in front of each other in order to create an opening. The most common version is for the panels to move vertically however horizontal-opening sashes are available as well.

The opening mechanism of a sash window is done through balancing weights and using pulleys or springs which are all concealed within the frame of the window. These are also what keeps the sash staying in its position once the window has been opened.

Beautiful new timber sash windows installed at a home in Tunbridge Wells, by Forster Timber Windows
New Sash Window fitted in Tunbridge Wells
Sash window repairs carried out in Tunbrige Wells by Forster Timber Windows


​A Casement Window is a window that is attached to its frame by one or more hinges at the side, allowing them to open inward or outward. They have been made of timber since the Victorian era.


Casement windows are very popular and I have repaired and replaced a number of them so please see the CASE STUDIES page for examples of client work carried out.

Please note Casement windows can also be referred to as Casement Sash Windows - which can be a little confusing!

New replacement casement window by Forster Timber Windows
New wooden casement windows installed at a home in Ticehurst, by Forster Timber Windows
Wooden casement window looking out onto a patio, installed and fitted by Forster Timber Windows


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