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'Almost Too Much To Comprehend': WA Counts Cost Of 'Devastating' Bushfire

Authorities are calling for patience from homeowners desperate to assess damage from the devastating bushfire in the Perth Hills.

More than 80 homes have been confirmed destroyed by the blaze, with Western Australia's Premier Mark McGowan describing the loss as "almost too much to comprehend".

Estimates of properties lost in the city's northeast started at 56 on Tuesday morning. By Wednesday the number had grown to 71 before rising again on Thursday.

Department of Fire and Emergency Services Superintendent Peter Sutton said no more houses were lost on Thursday night despite firefighters being troubled by gusty southeast winds over the fireground.

He said authorities were trying to clear damage from the areas seriously impacted by the blaze so homeowners could return to assess their properties.

"I understand there is a lot of frustration from the members of the community, particularly those who have lost properties," he told reporters on Friday.

"There are quite a lot of hazards in there still," he said of the impacted area.

"We have powerlines down, we obviously have the issue of asbestos because of the area and also we have issues with chemicals because it is a semi-rural area.

"We just ask people to please be patient."

On Thursday, Mr McGowan described the damage as "devastating".

"We're all thinking of those who've lost their homes. In some cases, their livelihoods," the premier said.

"The devastation caused by these bushfires is almost too much to comprehend."

An emergency alert remains for Shady Hills View, Bullsbrook's east and north of Gidgegannup.

"It's too late to leave and leaving now would be deadly," Western Australia's Department of Fire and Emergency Services said.

"You must shelter before the fire arrives as the extreme heat will kill you well before the flames reach you."

Those in the surrounding emergency warning zone have been told to leave if not prepared to fight to blaze.

Weather conditions are not expected to improve until the weekend, when rain has been forecast. In the meantime, the area is set to endure warm temperatures with strong winds and low humidity.