Casement windows are hinged at the side. (Widows hinged at the top are referred to as awing windows. One hinged at the bottom are called hoppers.) They are used single or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay.

Aluminum profiles are the best material of the framework, they have the excellent processing and mechanical performance, and a wide variety of color choices (powder coat, PVDF coat, anodize and wood) that adapt to variety of decoration styles and long-lasting colors against all weather conditions.