St James’s Gateway, London

St Jamess Gateway 1

Eric Parry Architects

Structural Engineer
Waterman Group

Steelwork Contractor
William Hare Ltd

Main Contractor
Lend Lease

The Crown Estate

The St James’s Gateway redevelopment includes 57,000ft2 office space, 28,000ft2 retail space and 18,000ft2 residential space.

The existing structure was replaced generally with a composite steel frame with normal weight concrete floor construction utilising composite metal decking. The grid varies with a maximum of 15m spans. This challenging, bespoke and innovative scheme involved digging out a two storey basement, installing 2,500m of closed-loop geothermal pipework, constructing a 1.2m-thick waterproof concrete raft foundation and erecting a braced steel core at the heart of the steel frame.

The Piccadilly façade embraced a steel Vierendeel frame construction to accommodate the large window frontage. As part of the development, the existing building at 27 Regent Street was refurbished; this included an architectural steelwork stair that was installed within the existing fire escape.

Judges’ comment

Several diverse properties owned by the Crown Estate on a prominent site in Piccadilly, central London, have been given a new life as upmarket retail, office and residential accommodation. A pragmatic steel structure throughout has effectively enabled a sensitive restructuring, and combination of façade retention and invention.

The steelwork was key to meeting the complex programme.