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Sketch Section
Proposed Plans
Detail Section


Grain Architecture obtained planning permission to retrofit and extend this mid-terrace house on a sloping site in Surrey. The existing house has timber frame walls over a concrete and masonry basement. The existing concrete steps down to the basement are in poor condition and are don't provide the best connection between the house and the garden.

The existing timber frame walls and loft will be insulated with natural insulation and the heating system will be upgraded ready for the installation of an ASHP. The ground floor will be opened up to make better use of the space with a new enclosed stair down to the basement. The basement will be insulated with Cork Boards and extended to the rear with new glazed timber doors opening onto the garden terrace. The roof of the extension will create a larger balcony terrace making the most of the views out over the valley, this will be accessed off the upper ground floor living area.

Low carbon, natural materials will be used wherever possible, including flexible and rigid woodfibre in existing and new timber frame walls, and larch cladding to the rear elevation. The new basement/lower ground floor will be limecrete over insulating foamglas aggregate rather than a concrete slab.

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