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Order your roof lantern to the external kerb size, not the ceiling opening. Our sizing guide covers measuring the kerb, the right lantern for 3x3m to 6x4m extensions, one large lantern versus two, ridge height, glass weight and bar sightlines, with live Korniche size and price data.

Everything you need to choose a roof lantern: how it differs from a rooflight, Korniche vs Atlas vs Sheerline vs Solaris, which glass for which orientation, sizing, live prices, planning and Building Regulations, and a pre-order checklist.