- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 02 Nov 2020
The term sill (or cill), refers to the lowest horizontal element of a structure or body. In the construction industry this most commonly relates to a window sill, or sometimes to the threshold of a door.
A window sill (or windowsill, sometimes referred to as a window ledge) may be formed by timber, stone, slate, brick and so on, and is located at the base of the window. It may provide structural support for the window, and on the exterior may be inclined and project beyond the surface of the wall to shed rainwater.
 Related articles on Designing Buildings Wiki
Featured articles and news
Organisation alerts membership to findings of IHBC research.
Four outstanding professionals recognised.
Sustainable flooring from super strong grass.
Organisation presents reactions from industry leaders.
New infrastructure bank to be based in the North of England.
Fairer, faster, greener. A summary of the key points.
Strategies to help provide safer working conditions.
Protecting flora, fauna and the other natural features of Scotland.
Architecture considered somewhere between 'sublime and beautiful'.
Polish piano factory revived through an energy-oriented tune up.
Dynamic architectural approach sets out to restore and improve the environment.
Entries accepted from 1 December 2020 to 14 April 2021.
Procedure discontinued for sale or re-mortgage of buildings without cladding.