Two new build houses within a mews road adjacent to Green Park in Mayfair. Works required the demolition of an existing four-storey rear annex building within the Mayfair Conservation Area and construction of a new building consisting of three basement levels and four levels above ground level. The external facade of the building was clad in continuous structural glass including several rooflights, walk on floors and winter gardens.
Reinforced concrete basement levels with perimeter contiguous piled retaining walls adjacent to existing party walls and structural steel framed superstructure above ground level. Consultation with London Underground was necessary due to proximity to existing assets and tunnels. The multi-storey basements incorporated swimming pools, spas, gyms, cinema rooms, car-stacker and car lift for four vehicles.
A Top-Down form of construction sequence was utilised in order to speed up construction and minimise temporary basement propping requirements. The top (B1) basement slab was first cast between the perimeter contiguous piled retaining walls that enabled the tunnelling under while acting as the permanent prop for the piled retaining walls. The upper super structure construction was able to commence simultaneously with the basement excavation. It should be noted that following the construction of the B1 slab the design of the temporary works enabled the digging of the remaining two basements (over 10.0m) to enable the construction of the B3 slab.
The super structure above ground level consists of cellular steel beams and thin concrete slabs on profiled metal decks with fully glass clad elevations above ground level. Green roof and ground source heat pumps. Level 4, Code for Sustainable homes.
GIA: circa 1,650m²/ 17,750ft²
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