Natural Light / Daylighting

The use of architectural design to maximise natural daylight within a building. In extensions this includes specifying roof lights, large south-facing windows, glass walls, and light-reflecting interior finishes. Adequate natural light is required by building regulations in habitable rooms (opening area must not be less than 1/20 of the floor area). Poor daylighting in single-storey extensions is a common design failing that can be avoided with well-placed roof lights.