California Code, Health and Safety Code - HSC § 18931.6

(a) Each city, county, or city and county shall collect a fee from any applicant for a building permit, assessed at the rate of four dollars ($4) per one hundred thousand dollars ($100,000) in valuation, as determined by the local building official, with appropriate fractions thereof, but not less than one dollar ($1).

(b) The city, county, or city and county may retain not more than 10 percent of the fees collected under this section for related administrative costs and for code enforcement education, including, but not limited to, certifications in the voluntary construction inspector certification program, and shall transmit the remainder to the commission for deposit in the Building Standards Administration Special Revolving Fund established under Section 18931.7.

(c) The commission may reduce the rate of the fee upon determining that a lesser amount is sufficient to maintain the programs established under this part.