The building official shall promptly examine or cause to be examined, each application for a building permit and all materials filed in conjunction therewith, in order to ascertain whether the proposed work is in accordance with the requirements of the provisions of this Chapter. Whenever the actual physical conditions of the proposed work, or the site thereof, are not apparent from the application for a building permit and the materials filed in conjunction therewith, the building official shall examine or cause to be examined the site of the proposed work in order to determine such conditions.

SOURCE: GC § 31025.