Permits and inspections: what needs one, the four exemptions, and how to pass rough and final the first time
In one paragraph
In California housing, a written permit is required before you install, alter or reconstruct any electrical system, and the code names exactly four things a local department must exempt from permit and inspection: plug-in temporary decorative lighting, reinstalling a receptacle (not the outlet), replacing a breaker of the same rating in the same location, and communications wiring. Everything else, from a new circuit to a panel change, is permitted and inspected at rough and final, and the work stays open until it is approved. Two state laws ride along on residential permits: smoke alarms must be State Fire Marshal listed before the department will sign off on any job over $1,000, and existing homes with gas appliances, a fireplace or an attached garage must have carbon monoxide alarms. Skipping permits is a licensing case, not a paperwork problem.
The rule
A written construction permit must be obtained from the enforcing agency before the erection, installation or alteration of any electrical system in housing, with only the four exemptions the code lists, and permitted work must remain accessible and exposed for inspection until approved (2025 CEC Article 89.108.4.1, 89.108.4.4). A permit issuer may not sign off a dwelling alteration, repair or addition over $1,000 until the permittee shows the required smoke alarms are State Fire Marshal listed (H&S 13113.7(a)(2)). Willful disregard of any state or local permit law is cause for discipline against the license (B&P 7110(h)).
Why it matters
The permit is the customer's protection and yours: an inspector's signature is the only third-party proof that the work met code the day it was done, and it is what a home inspector, an insurer and a buyer will look for. Contractors lose licenses over permits far more often than over workmanship, because the violation is in the county's records forever and needs no expert to prove.