The building official and the fire code official, or their designees, shall monitor compliance with this chapter and may perform enforcement inspections upon, but not limited to, the following instances: when notified of a change in occupancy; when reviewing or inspecting the construction, repair, rehabilitation or renovation of the interior of a residential occupancy pursuant to a required permit, when inspecting at the request of the building owner or his representative; when inspecting for any other purpose under the provisions of this code; or when on the premises for any lawful purpose, including but not limited to such purposes as responding to a fire or other request for fire department services.