Countryside beat rival developers Lovell, Bellway, Family Mosaic and Regenter to land the job for Waltham Forest council.
The regeneration of the 1960s Marlow Road Estate will see existing properties replaced with over 400 new homes.
Detailed design proposals will be submitted for approval in Spring 2015 with building works starting later in the year.
The scheme, designed by Stitch Architects, includes 150 affordable homes and flexible retail space around a new Plaza and public square.
Richard Cherry, Chief Executive of Countryside’s Partnerships division, said: “Our focus will be on bringing back traditional tree-lined streets that link well with the surrounding area, with active frontages providing well defined spaces for the neighbourhood to enjoy.”