Leigh House is one half of a Grade II listed pair of Regency stucco villas facing Hampstead Heath, and years of subdivision had left its lower-ground flat cramped and cut off from the garden. We designed a rear extension and a garden room to put that right, with listed building consent from Camden. The single-storey extension is rendered in stucco with a hipped zinc roof, bringing light and volume without touching the principal elevations. At the far corner of the garden, a timber garden room with a sedum roof settles quietly within the boundary walls.