Flat Roof with Aluminium Roof Lantern

The roof of a single-storey extension, photographed from above on completion. A large aluminium-framed roof lantern sits centrally in a smooth grey flat-roof membrane, its slim frame and clean upstand detail bringing a shaft of daylight down into the room below. The membrane is dressed neatly around the lantern and up to the surrounding roofs.

The roof lantern is what turns a flat-roofed extension from a dark box into a light-filled room. Getting it right is all in the detail — a properly built warm-roof deck, a membrane laid without a wrinkle, and the lantern upstand flashed so it stays weathertight for the long term.