(CNBC) - Starting next year, every new home built in California will have something extra on top.Recently, California became the first state in the nation to make solar mandatory for new houses. Beginning in 2020, newly constructed homes must have solar panels, which could be costly for homeowners: According to California's Energy Commission (CEC), that mandate will add between $8,000 and $10,000 to the cost of a new home.
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