The redevelopment of Hayes town centre Austin Road and Avondale Drive Estates will now start this autumn.
This will deliver around 740 new homes – 50% for sale and 50% affordable – from flats to family-sized homes.
The phasing of the two projects will allow as many current residents as possible to move into one of the new homes on site.
The council’s planning committee approved the masterplans for both estates in March this year following extensive consultation with residents on the designs.
Declan Higgins, Partnerships Director at Higgins Partnerships, said: “We are delighted to be working in partnership with Hillingdon Council to deliver high quality sustainable homes across these exciting sites and throughout the wider borough.
“As well as creating places people are proud to call their home, we will be working with the local community to provide training and employment opportunities for those wishing to start a career in the industry.”