The other two successful firms on the Hackney Homes deal are understood to be Lakehouse and Mullaley.
Under the four-year partnership, worth £73m to each contractor, thousands of homes will be upgraded in the London Borough.
The trio beat off competition from Wates, Apollo and Lovell Partnership.
Mansell will also manage the specialist supply chain in collaboration with Hackney Homes.
Work is scheduled to commence in October 2010.