Over the past 25 years, 77 per cent of Perth's population growth has been in the outer suburbs.
And the trend, which is expected to continue at least for the next 10 years, is putting pressure on the provision of crucial infrastructure and services.
So in an unprecedented call for action, the chief executives of councils representing these suburbs have come together to ask for "a fair share".
They say their councils - the cities of Mandurah, Wanneroo, Rockingham, Armadale, Kwinana, Cockburn, Swan and Gosnells and the Shire of Serpentine-Jarrahdale - need government commitments to important infrastructure to meet unprecedented demand.
With so much focus on country areas through Royalties for Regions and big city projects like Elizabeth Quay and the new football stadium, they want help to provide services in areas where eight out of 10 new Perth residents will be living by 2031.
"A gap exists between West Australians living in established suburbs and those in growth areas," Armadale chief executive and spokesman for the group, Ray Tame, said.
"Established suburbs already have community facilities and services, often with better public transport, allowing cheaper and easier access to work, study and services not available locally.
"There is not enough community infrastructure in these growth areas to meet demand.
"And a lack of community infrastructure threatens social and economic health."
Mr Tame said that by 2026, about one in five people would live in the outer suburbs.
He said they would largely live in greenfield areas, with no existing roads, parks, schools, shops, sporting fields, libraries, cultural centres or other community facilities.
While local governments worked to provide these services, State and Federal governments could assist - particularly with transport infrastructure that provides better access and reduces congestion.
Mr Tame said the bosses of the nine outer-metropolitan councils had compiled a list of transport infrastructure priorities for the consideration of government.They included upgrading Burslem Drive in Thornlie, upgrading both the Albany and Reid highways, extending Tonkin Highway south to Mundijong, realigning the freight rail line at West Mundijong, putting extra lanes on each side of Kwinana Freeway, building a bridge linking North Lake and Armadale roads and upgrading the Fremantle traffic bridge.
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