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A gable roof lantern on an extension works well when the extension is wide and you want daylight to fall in two directions.
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Lean-toGable
A gable roof lantern on an extension works well when the extension is wide and you want daylight to fall in two directions. Two glass slopes meet at a ridge, as standard up to 6 metres long and 4 metres wide per roof slope, from €2,399. If the extension is narrow or there is a window just above the roof, a lean-to roof lantern is usually the more logical choice.
A full-width rear extension is often 5 to 7 metres wide. A single glass slope on one side leaves part of that space dark. A gable roof lantern spreads the light over two slopes, so both the seating area and the dining table get daylight from above.
It is less suitable if the extension is narrower than about 2.5 metres, or if the bedroom window above sits low in the rear wall. The ridge can then end up right in front of that window. Unsure which of the two classic shapes to choose? Read lean-to or gable roof lantern first.
First choose the direction of the ridge. If it runs parallel to the rear wall, light falls towards the front and the back. If it runs from the old wall towards the garden, you get light on the left and right of the room.
Then the ridge height. The gable has a standard pitch of 8°, so the height of the ridge follows from the horizontal depth of each slope. With 1.5 metres per slope, the ridge rises about 0.2 metres above the upstand. If you want the ridge off-centre, an asymmetric gable is possible. More on the pitch in the right pitch for a roof lantern.
On a flat extension roof the lantern sits on an upstand. The upstand is taken into the roof covering, usually EPDM or bitumen. You can see what that detail looks like in connecting a roof lantern to EPDM.
Water drains through the self-cleaning drainage system in the bottom rails of both slopes, to the existing gutter or downpipe. Because a gable drains to two sides, the extension roof must fall properly towards the outlet on both sides of the lantern.
HR++ double glazing is standard and triple glazing is optional. If the extension faces south, solar control glass is worth considering. Delivery is from 2 weeks after approval, up to 8 weeks for complex bespoke work or special glass. You collect the lantern in Barneveld or have it delivered on an agreed date. Your own builder installs it using the installation manual supplied with every delivery. For a rough total, read what a gable roof lantern costs.
The roof lantern itself usually needs no separate permit. The extension sometimes does, and the ridge can count towards the permitted height. So check with your local council before you fix the size.
Usually yes, provided the structure allows it. Glass is heavier than a rooflight dome, so your builder or structural engineer first assesses the load-bearing capacity around the opening.
No, an asymmetric gable is just as much a bespoke product as a symmetric one. The price depends on size and glass and is in your quote within 24 hours.
Send a photo or sketch with dimensions. Within 24 hours you receive a quote with glazing options, lead time and price.
Request a quote Get in touchA few questions, a photo or the dimensions, and we will prepare a tailored quote. Prefer to call: +31 342 223 190.
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