More than 1,100 structures have been destroyed in the fires. By the time the wildfires are extinguished, insurance claims could reach $500 million, according to the nonprofit insurance information group.
The 1991 Oakland Hills fire remains the state's most destructive brush fire, destroying 2,900 homes and resulting in $1.7 billion in insurance claims.
"We're not yet done with these very unpredictable fires, which will clearly cost hundreds of millions of dollars, and are likely to reach at least $500 million in insured losses," said Candysse Miller, the network's executive director.