Claridge House

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Net-zero carbon refurbishment of two floors of a 1920s, neo-Georgian building in the Mayfair conservation area to meet LETI retrofit guidelines and Grosvenor’s bold environmental goals.

Client: Grosvenor
Location: London
Size: 8 units
Status: Under construction

Existing office space is to be converted back to its original residential use while the building remains occupied on the upper floors. Improvements to the building fabric and the introduction of hidden air source heat pumps and PV panels at roof level will improve the energy use efficiency. New cycle and refuse provision will be at basement level.

The building was constructed around 1920 with a neo-Georgian red brick composition with painted timber vertical sash windows to the principal elevations on Davies Street and Brook’s Mews and Crittall windows to the lightwell. As well as internal wall insulation, secondary glazing will be added to the sash windows, the rear Crittall windows will be replaced. A new roof covering and insulation will improve the thermal efficiencies of the existing building.

Key interventions include:

Insulation: low embodied carbon and vapour open insulated plaster, 0.5 W/m²K
Windows: vacuum glazed secondary glazing to front elevation, double glazed casement (Crittall) to rear elevation
Ventilation: low energy heat recovery system
Air-tightness: air tightness tape, sealant and sheet, air leakage target of 3m3 /m2 /hr@50Pa
Renewables: 45 photovoltaic panels, renewable energy source, 16kWh/m2
Energy use: automatic meter reading, energy management system, EUI estimate is 68.6kWh/m2 , existing EUI is 233kWh/m2 , a 70.5% reduction.
Greener spaces: bio solar green roof
Active travel: 14 cycle racks Fossil fuel free