A recent rule change could cause a spike in insurance premium for homeowners across California, as the costs of the Los Angeles area wildfires are passed onto them in a way that was not allowed in the past.

The California FAIR Plan, the state’s insurer of last resort, had just $377 million available last week to pay claims that could reach billions, officials said.

Home values throughout California could face downward pressure following the Los Angeles-area wildfires as increases in insurance premiums exacerbate the state’s affordability crisis, S&P Global Ratings said.