Rooflight Questions Answered
Short, direct answers to the questions people ask us most before a rooflight goes in.
Featured
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Do Roof Lanterns Need Planning Permission?
When a roof lantern needs planning permission, when it does not, and the checks to make before you order one.
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What Pitch Does a Flat Rooflight Need?
How much slope a flat rooflight needs to shed water, how the kerb provides it, and why you follow the maker's figure.
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Can a Roof Window Be Fitted Without Scaffolding?
When a roof window can go in from inside, when a scaffold is the safer choice, and what we check first.
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How Do You Find Your VELUX Window Code?
Where the VELUX data plate sits, what its size and type codes mean, and what to do if it has gone.
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What Happens to an Electric Rooflight in a Power Cut?
Electric rooflights mostly stay put without power. Battery backup and manual override depend on the model, so check the unit.
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What U-Value Should a Rooflight Have?
The legal limit for a replacement rooflight is 2.2 W/m²K. Good modern units do far better, so here is what to aim for.