Cal. Pub. Util. Code § 21675.1
(c) The commission may approve an action, regulation, or permit if it finds, based on substantial evidence in the record, all of the following:
(g) A commission may adopt rules and regulations that exempt any ministerial permit for single-family dwellings from the requirements of subdivision (b) if it makes the findings required pursuant to subdivision (c) for the proposed rules and regulations, except that the rules and regulations may not exempt either of the following: