At least 26 homes have been destroyed in the bushfires in the Adelaide Hills.
Premier Jay Weatherill said 41 outbuildings have also been destroyed or badly damaged by the Sampson Flat fire but that figure is expected to climb.
Mr Weatherill said 29 people have been injured or hospitalised as a result of the fire.
The current priorities of fire crews are to contain the fire within its massive perimeter, clear roads to help restore services and to protect the more than 1000 homes in the fire zone.
Mr Weatherill said conditions are hindering the damage assessment teams, but authorities were determined to allow residents access to their properties as soon as practical.
The Country Fire Service says the four-day old fire has not expanded significantly on Monday, but conditions are predicted to worsen.
Mr Weatherill praised the work of fire fighters and was relieved he's not having to talk about deaths.
"But we've got a bit of a way to go before we can relax," he said.
Country Fire Service chief officer Greg Nettleton said more firefighters from NSW and Victoria would arrive on Monday and Tuesday as part of efforts to prepare for potentially more volatile conditions on Wednesday.
Temperatures are forecast to sore to 38C on Tuesday, and again on Wednesday when a late weather change should move through the fire zone, bringing with it shifting winds and the possibility of thunderstorms.
"The day of the change is always the day of highest potential," Mr Nettleton said.
"It's always on the day of the change that it's one of those watch-out days for us."
However, Mr Nettleton said he was not anticipating conditions to be as bad as they were on Friday or Saturday.
"If I compare where I was at on Saturday afternoon to where we're at now, I'm much, much more comfortable," he said.
Authorities on Monday allowed residents back into some fire-affected areas but about 20 checkpoints remain in place, with falling trees and powerlines a major safety concern.
About 1000 homes were still without power on Monday afternoon.
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