In depth

Lean-to or wall-abutting lean-to: what is the difference?

A mono-pitch or lean-to roof lantern is a single sloping glass surface in a roof, with a low and a high side.

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In depthReading time: 3 minutesUpdated: September 2026

The short answer

A mono-pitch or lean-to roof lantern is a single sloping glass surface in a roof, with a low and a high side. A wall-abutting lean-to roof lantern works on the same principle, but its high side meets a taller wall, giving you both overhead and side light. If your roof lantern sits freely in the roof, choose a lean-to. If it meets a wall, choose the wall-abutting version.

The lean-to: one surface, free in the roof

The lean-to roof lantern sits with one sloping glass surface in a flat or gently pitched roof. It has a standard pitch of 8°, in line with the advice of at least 7° for good drainage. It is the most popular type for extensions.

Up to 5 metres wide is possible in one panel without an intermediate bar, wider with one or more thermally broken bars. The 1, 2 and 3 metre sizes are always in stock. Prices start at €1,532.

Thermally broken aluminium frame
Up to 5 m wide without an intermediate bar
1, 2 and 3 metres always in stock
From €1,532

The wall-abutting lean-to: against a taller wall

The wall-abutting lean-to roof lantern is designed for the spot where a lower roof meets the wall of the main house, a roof extension or a taller neighbouring house. The high side connects to that wall. You get overhead and side light, exactly where an extension is often darkest.

Here too the standard pitch is 8°. The wall connection uses a wall abutment profile plus an EPDM lead substitute or a zinc flashing, depending on the wall type. The wall-abutting lean-to is supplied made to measure, including upstand and connection profiles. Prices start at €1,689.

Overhead and side light along the wall
Aluminium frame in any RAL colour
Connection profile for your wall type included
From €1,689

Lean-to or wall-abutting lean-to: how to choose

The question is simple: does the high side of the roof lantern touch a wall? A rear extension on a terraced house often has the main house as its back wall. Then a wall-abutting lean-to is the obvious choice, see also a roof lantern on a terraced house. If the roof lantern sits in the middle of the flat roof, a standard lean-to makes more sense.

For a wall-abutting lean-to, the wall type belongs in your enquiry. Brickwork, timber cladding, render, sand-lime brick and concrete panels each need their own connection profile. How a zinc connection works is explained in connecting a roof lantern with zinc.

Frequently asked questions

What pitch does a lean-to or wall-abutting lean-to have?

Both have a standard pitch of 8°. At least 7° is advised for good drainage, so they meet that. More detail is in the right pitch for a roof lantern.

Why does a wall-abutting lean-to have a higher starting price?

A wall-abutting lean-to is supplied including upstand and the connection profiles for your wall type. The starting price is €1,689, against €1,532 for a lean-to. What your situation costs is covered in what a wall-abutting lean-to roof lantern costs.

Can a standard lean-to also go against a wall?

A standard lean-to is meant to sit freely in the roof. If the high side has to meet a wall, the wall-abutting version is the right type, because the wall connection comes with it as standard.

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