The penalty for building without a permit in Napa ranges from $1,000 to $30,000 per violation as of June 2015, states the San Francisco Bay Conservation and Development Commission, or SFBCDC. The commission often issues permits at twice the normal processing cost if the unpermitted work meets state law requirements.
When a building permit violation takes place, the property owner is the person legally responsible for it, notes the SFBCDC. The commission refers serious state law violations to California's attorney general for prosecution. State law penalties can range from about $50 and $5,000 daily for a negligent violation and $100 and $10,000 daily for a knowing and intentional violation, in addition to any other penalties.