Gable roof lantern on a garden room: sitting outside all year round

Why a gable roof lantern on a garden room?

A garden room often stands apart from the house or is linked to it by a corridor. A gable roof lantern with the ridge along the length of the room suits that free-standing position. The glass follows the line of a classic summerhouse or orangery. More about the application itself in a roof lantern in a conservatory or garden room.

A roof lantern has no moving parts. You air the room through the windows and doors in the walls, and a garden room usually has plenty of those. That way the glass roof stays one calm, sealed whole.

• Garden room that stands apart or joins the house via a corridor
• Classic look, in keeping with an orangery
• Ventilation through windows and doors in the walls
• Solar control glass against heat on the south side

How do you stop a garden room with a glass roof overheating?

A garden room with glass walls and a glass ridge catches a lot of sun. Facing south or west, the temperature can rise quickly on a summer afternoon. Solar control glass keeps part of the solar heat out. A pleated blind inside helps against glare; an external screen also stops the heat. Read how to prevent overheating.

In the design, keep a solid roof edge of a few decimetres around the lantern. That gives you somewhere to fix shading, lighting and curtain rails later without drilling into the frame.

Condensation and glass: HR++ or triple in a garden room?

Garden rooms often hold plants, people sit there and sometimes cook. That produces moisture. On cold days the moisture settles on the coldest surface. Good ventilation and a thermally broken frame limit this. Where condensation comes from is explained in condensation on a roof lantern.

If you also use the garden room in winter and it faces north or west, triple glazing makes sense. The U-value drops from about 1.1 to about 0.5 W/m²K. If the room faces south and you mainly use it from spring to autumn, HR++ double glazing is more than enough. The quote shows both side by side.

Dimensions, delivery and installation

A garden room of 3 by 4 metres often gets a gable over most of the roof. The standard goes up to 6 metres long and 4 metres wide per roof slope; larger is possible in modules. Delivery is from 2 weeks after approval, and your builder installs it using the installation manual.

• Internal dimensions of the garden room and height of the roof edge
• Orientation: south, north, east or west
• Whether you heat the room in winter
• Wishes for shading or a pleated blind

Frequently asked questions