Lives and homes continue to be threatened by out-of-control bushfires in Western Australia's southern region, and the destruction of buildings at a holiday-stay farm have been confirmed by the owner.

An emergency warning was issued for parts of Napier, Redmond and Marbelup in the City of Albany late on Thursday night and remained in place on Friday afternoon.

The Department of Fire and Emergency Services said it was too dangerous to access certain areas and assess damage.

But Linda Hoskins, proprietor of Nutkin Lodge at Peaceful Bay, confirmed some of the buildings on her 200-acre property - which contains cottages, sheds and campgrounds - had been razed.

"A large fire wall came across the property," Ms Hoskins told AAP.

"There are some buildings that are damaged and some are intact. The intact more than likely are smoke damaged. The ones that are destroyed are not quite levelled."

She said her family of five and four guests were saved by firefighters, who corralled them in a paddock overnight as they could not exit the property.

"They surrounded us with the fire trucks and had the water running to keep people safe. They blew me away with their amazing resourcefulness.

"We had a bushfire plan ready but the intensity and ferocity, and the speed with which it came through the property - nothing could have stopped it."

All farm animals including a turkey, chickens, pigs and sheep survived, as did the family's pet mice and crazy crabs, Ms Hoskins said, but the wildlife reserve surrounding the property was burnt.

She said the main dwelling where her family lives appeared habitable and that she had heard at least one neighbour's property had been damaged.

The bushfires have burnt through about 4300 hectares.

There are several other blazes in the region, including in Stirling Range National Park, where a watch and act alert has been issued.

DFES Superintendent Wayne Green said the large number of fires was stretching crews to their limit.

"Resources are absolutely stretched to the point where some of the fires that are coming in and being reported aren't even getting a response," he told ABC radio on Friday.

An evacuation centre has been opened at the Albany Aquatic Centre.

© AAP 2018