A precast window sill is a pre-made shelf, made from concrete. These sills offer the same benefits as traditional sills, providing structural support for the window and wall, but with the advantage of being manufactured off-site. This allows for faster installation during construction.

Made from durable concrete, precast sills are built to last and resist harsh weather. They often come pre-sloped to efficiently drain rainwater and some even have built-in channels for further water management.