The ACT Greens are pushing for 10 per cent of homes at the proposed Thoroughbred Park redevelopment to be public housing, but the Property Council warns the requirement could make projects less viable and reduce the number of homes delivered.

Greens Leader Jo Clay tabled a motion in the Legislative Assembly today calling for the requirement to be incorporated into planning for the precinct, which is expected to accommodate 6200 homes and up to 16,400 people.

Under the proposal, developers would be required to provide 10 per cent of homes as rent-fixed public housing, spread throughout the development, as well as additional community housing.

“There are over 3600 Canberrans stuck on the public housing waitlist right now,” Ms Clay said.

“Thoroughbred Park is a once-in-a-generation opportunity for government to lock in the public homes into a major infill development from day one.”

The motion also calls for developers to provide playgrounds, parks and community infrastructure and for planning to set aside land for future primary and high school capacity.

The Greens say several nearby schools are already approaching capacity, including Lyneham High and O’Connor Co-op at 93 per cent, and Dickson College and Lyneham Primary at 90 per cent.

Property Council ACT & Capital Region executive director Ashlee Berry said the organisation supported more affordable and social housing but opposed imposing the requirement on an individual development before its planning framework was finalised.

“The reality is that every additional mandate increases costs, reduces project feasibility and ultimately risks reducing the number of homes that get built,” she said.

Ms Berry said affordable and social housing could instead be supported through direct government spending, discounted government land and partnerships with community housing providers.

“Canberra can’t solve a housing shortage by continually adding new costs and obligations to housing projects,” she said.