Section 18509 Of Chapter 4. Permits And Fees From California Health And Safety Code >> Division 13. >> Part 2.1. >> Chapter 4.

. All permits as required in this chapter for construction or reconstruction shall automatically expire within six months from the date of issuance thereof in those cases where the construction or reconstruction has not been completed within said period; provided, however, that the enforcement agency may extend expiration date of said permit for a reasonable time.