The NSW Rural Fire Service has completed the first stage of property assessments following the fire, which has burnt through more than 3,300 hectares and is still out of control.
A total fire ban was issued for Sydney, the Illawarra and Hunter regions on Wednesday - something not seen so early in the season in almost a decade.
The blaze at Mount Kingiman, near Ulladulla, had burned through more than 1100 hectares.
Residents in the Woodstock area are advised to seek shelter in a solid structure as the fire approaches, with those in Burrill Lake, Kings Point and south of Ulladulla urged to move north.
An emergency centre has been set up at the Ulladulla Civic Centre.
An out-of-control fire burns near Ulladulla, on the NSW south coast.
Three teenage boys have been charged after allegedly lighting a fire during a total fire ban in the Blue Mountains yesterday, NSW Police say.
"It's right on them (properties) now", NSW RFS Deputy Commissioner Rob Rogers said.
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RFS Building Impact Assessment Teams confirmed one house was damaged in a separate bushfire at North Nowra, where one outbuilding was destroyed and another was damaged.
The NSW RFS said emergency alert messages had been sent to residents in the area, however, Kate Melzer, who lives in the danger zone, said she "had not been told anything".
Strong winds are affecting the region, with gusts of up to 104 kilometres recorded in Nowra earlier, and the Bureau of Meteorology has warned these will get worse.
"Under these conditions, fires are uncontrollable, unpredictable and fast-moving", the RFS said. Embers may be blown ahead of the fire, creating spot fires.
Earlier, dozens of fire trucks lined streets as people covered their faces at Bomaderry, near Nowra, as they tried to avoid breathing the plumes of smoke that were rising above homes.
Two separate blazes in Ellangowan and Ramornie in northern NSW were also downgraded from watch and act warnings to advice alerts.
The RFS has urged property owners to think twice before burning off on Wednesday, as temperatures rise to the mid-20s.
There are now "Very High" fire danger conditions, with this making it hard to bring the fire under control.