Belgian studio Mamout has extended a townhouse in Brussels, adding a small garden room built from a prefabricated shell of pastel green-coloured steel.

Aiming to improve the connection between the home and its garden, Mamout drew on the form of an existing bow window on the rear facade to create a glazed seating area for the existing kitchen.

Mamout has added a garden room to a townhouse in Brussels

"The aim is to create the smallest possible extension, but one that offers a radically new perception of space from the inside," Mamout architect Sarah Avni told Dezeen.

"We imagine the extension as a response to the existing bow window, which is a typical element of Belgian architecture," she added.

It is made from a prefabricated shell of green-coloured steel

The garden room sits slightly elevated off the ground to avoid covering the home's basement windows and is accessed from the garden patio by a small concrete stair.

While mimicking the existing windows form, Mamout opted for a steel structure that would provide a contrasting "thin and light look". This was manufactured as a single piece by a shipbuilding workshop in Liège, allowing it to be craned into place and "plugged into" the existing building.