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In depth

Can a roof lantern go on a pitched roof?

A roof lantern on a pitched roof is usually not a good idea: a roof lantern is made for a flat or gently pitched roof, not for a tiled roof.

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The short answer

A roof lantern on a pitched roof is usually not a good idea: a roof lantern is made for a flat or gently pitched roof, not for a tiled roof. In a pitched roof you usually choose a roof window or a dormer. A roof lantern can go on the flat part of your house, such as an extension or the flat roof of a roof extension.

Why a roof lantern does not belong in a pitched tiled roof

A roof lantern sits on an upstand that rises above the roof covering. On a flat roof that works well: water runs off past the upstand. A tiled roof is usually much steeper, and there water rushes down from above against such an upstand. Getting that connection watertight is difficult, and the roof lantern is not designed for it.

A roof lantern also has its own pitch. As standard that is a pitch of 8°. That is shallow compared with most tiled roofs. The glass would then sit in a different plane from the tiles around it.

What to choose in a pitched roof instead

For light in a pitched roof there are two common solutions. A roof window sits in the plane of the tiles and is designed to connect to tiles or slates with flashing kits. A dormer enlarges the space underneath and gives you an upright window.

For a loft or bedroom under the tiles, a roof window or dormer is therefore usually the better choice. DagLichtDesign focuses on roof lanterns for flat and gently pitched roofs.

  • Loft or bedroom under the tiles: roof window
  • More headroom needed: dormer
  • Extension with a flat roof: roof lantern
  • Flat roof on a roof extension: roof lantern

Roof lantern and a pitched roof: when it does work

Many houses have a flat section alongside the pitched roof: an extension, a garage, or the flat roof of a roof extension. A roof lantern works perfectly well there. On a flat roof you might choose a lean-to or a gable roof lantern.

A gently pitched roof also works. The roof lantern then sits on an upstand and gets its own pitch that drains well. How that works is explained in the right pitch for a roof lantern. Not sure? Send a photo or sketch. The quote arrives in your inbox within 24 hours.

  • Flat roof of an extension
  • Gently pitched roof with an upstand
  • Flat roof of a garage or roof extension
  • Not in the plane of a steep tiled roof

Frequently asked questions

Can a roof lantern go on a gently pitched roof?

Yes. A gently pitched roof, as on many extensions, is suitable. The roof lantern sits on an upstand and gets its own pitch that drains well: a standard pitch of 8°.

What is the difference between a roof lantern and a roof window?

A roof window sits in the plane of a pitched roof and connects to tiles or slates. A roof lantern sits on an upstand in a flat or gently pitched roof and is often much larger. Both are meant for daylight, but on a different type of roof.

Can a roof lantern go on the flat roof of a dormer?

If the roof is large enough and the structure allows it, yes. A dormer is often narrow, so the extra strip of glass stays limited. Have a builder assess what is possible, or read roof lantern or rooflight dome for a smaller solution.

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