Casement Windows

As standard our members supply double-glazed timber casement windows that provide exceptional levels of thermal efficiency and security. Triple-glazing is available, as is a choice of opening (top or side hung) and configurations (including bay and bow windows).

In the UK, there are two casement window designs – flush and stormproof.


Flush casement windows

As the name suggests, flush casement windows sit flush within the face of the window frame. The design is based on the original casement window that was first introduced to the UK in the 16th century and is also commonly referred to as ‘traditional’.

Available as top hung (i.e. opens from the top of the window frame) or side hung (i.e. opens from the side), our members offer a variety of period detailing to suit the needs of restoration projects or new builds in Conservation Areas. Examples of period detailing include butt hinges and astragal (glazing) bars.


Stormproof casement windows

During the 1950s the traditional flush design was adapted to provide enhanced weather protection. A lip was introduced to make the window stand proud of the face of the window frame, helping to better protect from driving rain, wind and snow – hence the name ‘stormproof’. This type of casement window is commonly specified for new builds and come with a number of opening options.


Made-to-measure designs

With years of experience between them, our members will advise on which casement window is best suited for your project. Whether exact replication is needed for a listed property or a modern look for a contemporary new build or extension, you can rely on our members to provide the optimal solution, backed up with peace-of-mind guarantees.

They will take into consideration users and safety requirements, plus practicalities like ease-of-cleaning. For example, if you are looking to specify casement windows for residential flats, then you might want to incorporate hinges that allow the sash to slide towards the centre to enable the outside to be easily cleaned.

For areas where the aesthetics of a sliding sash window is preferable, but the functionality of a casement window is needed (e.g. for safety purposes), decorative horns can be incorporated into the window design. This type of casement window design that provides an authentic sliding sash appearance is commonly known as a ‘regency mock sash’ window.