The 160-unit project in Isleworth is for the Congregation of the Sisters of Nazareth, an order of Roman Catholic nuns who care for the elderly.
The 3ha scheme will be arranged around a Grade II-listed Georgian villa and a Victorian chapel, and the practice has designed the individual dwellings with mobility and independence in mind.
The materials used will relate to the existing stuccoed convent and brick chapel, but will be 'softened' by the use of timber and lead pergolas and balconies.
Each dwelling will encourage gardening, and rainwater will be collected and piped to window boxes.
Several types of accommodation will be created, typically one- and two-bedroom flats in three- to five-storey buildings, each with a different level of care.