The job was first earmarked as a PFI prison to be built by Interserve before a Ministry of Justice procurement rethink leading to the new contract.
The firm was closely chased by McLaren in second place, which secured the £190m Cleveland Street flats scheme in central London’s Fitzrovia area for property developer Dukelease.
In the annualised league, Kier held on to top ranking with a haul of £2.46bn of work. Rival Morgan Sindall continued to run down the leader after closing the gap to just £100m.
According to estimates by information specialist Glenigan, Mace jumped ahead of Balfour Beatty into third position, which continues to boost the biggest haul of civil engineering contracts over the last 12 months.
Among the other big wins during August, McAleer & Rushe secured a £102m student accommodation scheme in Guildford for joint clients, Future Generation and Stone Grove Stoke Park.
BAM Construct signed off Durham University’s £70m Business School project. while Willmott Dixon secured the £70m All England Lawn Tennis Club new members’ centre at Wimbledon.