This innovative scheme at Merrick Place in Ealing is worth £157m and will be made up of mixed-tenure homes along with commercial floorspace across four separate buildings.
Now defunct Henry Construction had previously been lined up to deliver the major project, which has been designed by architect Cartwright Pickard.
It has been designed to maximise off-site construction and will be delivered by Vistry’s Countryside arm.
David Gooch, executive director of development for London and Herts at SNG, said: “The Merrick Place project in Ealing is a flagship scheme within SNG’s London New Homes Programme.
“We are delighted to have contracted with Countryside Partnerships who are also our joint venture partner at Northwick Park Hospital in Brent.
“Together these two projects will deliver over 1,100 high quality new homes in North West London.”