South Street, Mayfair


A comprehensive refurbishment, reorganisation, and restoration of seven flats (originally two houses) in a Grade II listed terrace of five houses designed by J. J. Stevenson in the late 1890’s in a Queen Anne Revival style. The terrace looks onto Mount Street Gardens, and bounds the Grosvenor Estate and the Berkeley Estate, forming part of the Mayfair Conservation Area.


Recently granted planning and Listed Building consents, this project is a generational upgrade to the communal access, services, and energy efficiency of the building, with over 1,200m² (12,940 ft²) internal area. It will reinstate the interior and exterior building fabric to a finish of the highest architectural quality.


Along with many of the houses in this part of Mayfair, these generous townhouses were converted into five lateral flats (later seven) in 1933. On behalf of the current freeholder, we have rearranged the overall organisation and remodelled the layouts to provide a better mix of sizes and layouts, including 1-, 2- and 3-bedroom apartments, to meet contemporary and future needs.


Our design reinstates the historic format, size and arrangement of internal spaces and restores period features that have been removed over time. The 1933 lift will be relocated to bring daylight into a new communal stair – a sweeping marble staircase with a delicate wrought iron balustrade – which will transform the experience of the circulation spaces.


Our proposal updates the building services to meet modern standards and expectations, removing communal gas heating plant in the basement and replacing this with consented air source heat pumps on the roof (using chimneys for connection routes!), along with compact ASHP hot water boilers within individual flats. We have also proposed the introduction of acoustic subfloors to reduce noise transmission between floors and party walls.



Design and Planning 2020-22