Construction and support services firm Carillion was yesterday celebrating a £500 million contract win from telecoms giant BT.

The Wolverhampton-based firm's Monteray consortium has been chosen to carry out maintenance work across the telecoms company's 7,000 UK buildings.

The deal covers BT's entire property portfolio - ranging from small, unmanned telephone exchanges in remote parts of Scotland to landmark sites such as London's BT Tower.

The contract, which runs until 2014, could also be extended for a further four years and generate an extra £30 million a year in revenues, Carillion said.

Carillion is the majority shareholder in Monteray, which has worked with BT since 2001.

The other members of the consortium are Haden Young, a subsidiary of Balfour Beatty, and Uxbridge-based facilities management firm Reliance Integrated Services.