Roof Lanterns

Light where a window cannot reach

A flat-roofed extension is usually darkest in the middle, furthest from the glazed back wall. A lantern puts daylight directly over that spot, which is why it transforms a kitchen-diner in a way another window on the same wall does not.

Kerb before lantern

The lantern sits on a timber kerb built up off the roof deck, which lifts the frame clear of standing water and gives the roof covering something to dress against. Get the kerb size from the manufacturer's figure rather than assuming it matches the aperture — this is the most common thing to get wrong.

Sizes and finishing

1m to 3m in white, grey and anthracite frames. Seal the kerb junction with a low-modulus frame sealant. Building regulations normally apply to the opening and the glazing, so check with building control.