A 1000-bed quarantine 'village'proposed by a private company for a site near Mandurah is unlikely to ago ahead after the state government revealed that construction would begin on a facility in October.
Perth company Grounded Construction Group in May proposed the site in Nambeelup, which is part of the Shire of Murray but borders the City of Mandurah.
Prime Minister Scott Morrison and Premier Mark McGowan on Tuesday signed a memorandum of understanding for the hub, expected to be located at Jandakot Airport.
While the Jandakot Airport site remains the primary site for planning, the MoU has been drafted to allow for continued scoping work on alternative sites as a contingency.
The facility is expected to be running at half-capacity by March next year.
Finance Minister Simon Birmingham said the WA project would allow the safe arrival of international flights into the state next year.
"It will increase our ability to respond to future emergencies or disasters, including the continued management of the COVID-19 pandemic into next year," he said.
The Federal Government will seek a parliamentary exemption from the formal Public Works Committee process so design, planning and construction will all be fast-tracked.
Australia will have four dedicated quarantine hubs for overseas arrivals but not until widespread coronavirus vaccination coverage is expected.
A Victorian quarantine centre in Melbourne's north is due to open by the end of the year when 500 of its 1000 beds are ready.
An agreement between the federal and Queensland governments has earmarked mid-2022 as the completion date for a 1000-bed facility near Brisbane airport.
Australia is pushing to reach 70 per cent vaccination coverage by Christmas, one of two key thresholds to reduce the prospect of lockdowns.
Almost 27 per cent of people have been fully immunised against the disease with a record 279,465 doses administered in the past 24 hours.
The Northern Territory's Howard Springs quarantine centre was expected to reach its capacity of 2000 places for the first time this month.
The virus has escaped state-run hotels up to 30 times during the pandemic with breaches leading to disastrous virus surges in Melbourne and Sydney.
Mr Morrison has insisted new dedicated quarantine facilities will supplement rather than replace the hotel system.