We get asked this question all the time and most of the time we explain that this comes down to personal preference. But the size of your rooflight will need to factor in a number of aspects related to the size of your roof and the layout of the room below.
The most obvious thing to consider is the size of your new or existing roof. People usually want to go as big as possible to maximise daylight, but you will need to ensure you have enough space around the Rooflight for enough waterproofing and make sure you have no obstructions on the roof, which is why its rare for a roof lantern to span the entirety of the roof. Its quite common, though, to see roof lanterns installed in the middle of the roof, as a center piece.
If you have seen any of our Roof Lanterns including Skypods and Em-Glaze Roof Lanterns that you like the look of, feel free to send us an external shot of your current roof or a sketch of your plans so that we can recommend some ideal sizes.
You don't always have to go big. Even a smaller 100 x 100cm lantern can let in a surprising amount of sunlight, whith the slim glazing bars and maximum amount of glazing, there is little light restriction.
Popular sizes are 100x150, 100x200, 150x250, 150x300cm. We even offer a really big roof lantern
at 5000 x 2500mm (But we can go bigger still!)
You will want to consider what is going directly below the lantern as this will be most illuminated by the lantern and incoming daylight. This might be a a kitchen island or dining table. This is why the roof lantern size and overall room layout are so closely worked together.