Bids were submitted last Friday for the mammoth project, ahead of an announcement by the internet giant this week that it was committing to building the scheme.

Construction News reported in June that Mace and Sir Robert McAlpine were among those interested in the project.

Google chief executive Sundar Pichai told the BBC: “We see big opportunities here.

“This is a big commitment from us – we have some of the best talent in the world in the UK and to be able to build great products from here sets us up well for the long term.”

Google said it planned to invest more than £1bn in the new King’s Cross building, designed by BIG and Heatherwick Studios, and hire thousands more staff.

The scheme was put on hold in November 2013 after Google called for it to be redesigned.

Bam Construct had been appointed as main contractor for the original scheme in March 2013, in a deal worth £300m.

Plans for the new London HQ have an estimated construction value of more than £600m: £400m for the shell and core, and around £200m for the fit-out.

Google’s staff are currently spread across offices in Covent Garden and Victoria, with the new offices bringing them together under one roof.

The tech giant already has a presence at the King’s Cross redevelopment site, having taken 6 Pancras Square (pictured).

It is also developing a 280,000 sq ft office block known as S2 on the site, which was given the green light by Camden Council in March.

The 27 ha King’s Cross site is one of the largest redevelopments in London, with the masterplan including 50 buildings and 1,900 homes.

It is being developed by the King’s Cross Central Limited Partnership, which includes Argent, DHL and London & Continental Railways and was formed in 2008.

Argent declined to comment.

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