Warrington Borough Council’s development management committee acted in line with planning officer recommendation in approving the two outline applications from housing and regeneration quango the Homes and Communities Agency.
Up to 400 dwellings were approved for land south of Astor Drive in Warrington while up to 370 homes, as well as health and retail space, were allowed on land close to Green Lane in the town. Both sites are on the southern edge of the town.
According to a planning report, Grappenhall & Thelwall Parish Council, Appleton Parish Council and Stockton Heath Parish Council were among those who raised traffic concerns about the Astor Drive development.
More than 360 objections were received from neighbours, with traffic again cited as a major concern.
However the planning report concluded that the scheme would make a "significant contribution" to housing land supply, and that "detailed assessment" of traffic impact showed no infrastructure was needed beyond that already agreed.
"There are considered to be no overriding adverse impacts which would significantly and demonstrably outweigh the potential benefits of granting planning permission," it added.
Planners came to a similar conclusion with regards to the Green Lane application, ruling that highways, environmental, ecological, heritage and other potential impacts could be mitigated against.