Bushfires near Perth burn out of control

Roleystone resident Bennett Moran uses a gum tree branch to beat down flames after a bushfire raged through his Perth Hills community. Photo / AAP

More than 40 houses are expected to have been destroyed as a bushfire remained out of control in Roleystone, in the Perth hills, a senior fire official says.

John McMillan, regional coordinator for the WA Fire and Emergency Services Authority, says the fire services are 100 per cent committed to fighting the fires, and crews are tired.

"At the moment we have assessment teams out in the field, assessing the structures that have been impacted," he told ABC radio on Monday.

"The 40 (homes) ... is expected to be revised upwards in the light of day.

"We haven't had loss of life. We are grateful for that but certainly there's a lot of trauma that goes with it."

Mr McMillan said neither of two big fires outside Perth are under control, and unpredictable and strong winds are expected on Monday morning.

"Our struggle will remain until we get some respite in these unusual weather conditions," he said.

"It's just the strength of the easterly winds. They were at damaging strength two days ago and they have maintained the consistency."

One firefighter has been injured and taken to hospital after he was believed to have been hit by a fire truck near Roleystone.

At least 12 people have been hospitalised with smoke inhalation.

Hundreds of residents have evacuated from Roleystone and the nearby bush-fringed community of Kelmscott and to escape the other big blaze at the edge of the Swan Valley to the north where homes, vineyards and farms are also threatened.

Relocation centres have been set up near both fires and residents of a nursing home in Kelmscott have been evacuated to a shopping centre.

Many roads have been closed in threatened areas and residents who have left will not be allowed back until the all-clear is given.

- AAP