Original article by Ella Jessel |
Nimtim Architects creates “textured envelope” for Hemp House extension
Hempcrete and timber form the rough-hewn walls of this south London house extension, designed by local studio Nimtim Architects with a focus on low-carbon materials.
Named Hemp House, the project updates a traditional semi-detached home in Upper Norwood, Croydon, to provide its owner room to host dinner parties and flexible space for their growing family.


Nimtim Architects added the single-storey extension to the rear of the home, introducing a new living and dining area that overlooks the patio and garden.
The kitchen has been moved from the back of the house to the centre, connecting to the living and dining room and creating a more sociable space and flow. This has also provided views of the back garden from the front door.
In addition to providing more space, the family also wanted the Hemp House extension to “impact the world lightly” through the use of natural materials, according to Nimtim Architects.
Instead of using traditional brick for the extension’s structure, the studio used a timber frame infilled with hempcrete – a durable and insulating bio-material formed of hemp fibres and lime. Hemp can be grown locally in the UK and absorbs carbon during its growth.

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