Cal. Health & Saf. Code § 17002
The provisions of this part are not intended to prevent the use of any material, appliance, installation, device, arrangement, or method of construction not specifically prescribed by this part if such alternate has been approved by the Department of Housing and Community Development.
The Department of Housing and Community Development may approve any such alternate if it finds that the proposed design is satisfactory and that the material, appliance, installation, device, arrangement, or method of construction offered is, for the purpose intended, at least the equivalent of that prescribed in this part in quality, strength, effectiveness, fire resistance, durability and safety, for the protection of life and health.
This section shall not apply to a local ordinance which is applicable pursuant to Section 17001.
Ca. Health and Saf. Code § 17002