A roof light is a window built out from a sloping roof with the window at the same angle as the pitch of the roof. It allows for natural lighting and ventilation into a habitable room or attic. On new buildings the roof structure would be designed to accommodate the roof light. Where a roof light is to be installed in an existing roof structure the roof must be opened and trimmers and framing constructed to receive the roof light.
Roof lights are available as roof windows i.e. opening sash, or as a skylight i.e. non-opening fixed light. The frame is constructed from Hardwood and is grooved on the bottom edge to receive the ceiling boards of the light well.