The fire engulfed the entire town of Yarloop near Perth last week, destroying at least 128 homes.
Police say the bodies of two men in their 70s have been discovered in the debris of burnt-out houses.
More favourable conditions on Sunday allowed firefighters to set up containment lines.
The fire perimeter is currently around 232km (144 miles), the Department of Fire & Emergency Service (DFES) said. Read more on bbc.