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What Size Roof Lantern Do I Need? A Room-by-Room Sizing Guide (2026)
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.
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