Casement windows are a type of window that open (in or out) from a top or a side hung butt hinge and are typically operated by a lever or handle. They can incorporate fanlights, as well as opening or fixed sashes in a variety of combinations. Casement windows offer several advantages, including excellent ventilation control, unobstructed views, and energy efficiency.

Types of casement window

Side hung

A side hung casement window is hinged to either the right side or the left side of the sash frame and can open in or out.

Top hung

A top hung casement window is hinged to the top of the sash frame that opens in or out. It is common for top hung casement windows to be paired with a side hung panel below it.


A fixed casement window does not open. Some fixed casement windows will have mock sashes (dummy sashes) so that that they fit in with the style of other windows that do open (i.e. they might have a handle and a casement style configuration, but they do not actually open.

Popular casement window configurations

The most popular designs are the single opening casement, double opening casement and the triple casement, which has two opening sashes on the outside and a fixed centre sash. The sashes in a casement window can either be rebated together, or they can have a centre mullion. These may also have glazing bars. Flush casement windows fit into this category too – they’re broadly similar but sit flat within the frame.
Here are some of the most common casement window configurations crafted and installed by our team:

Key: Fixed Frame or Dummy Sash Top Hung Left Hung Right Hung

Whether you need to repair, replace, or need completely wooden casement windows, we can help! We make everything bespoke so we can accommodate any configuration of your choosing.