Short answer
Most equipment replacements and installations — AC, heat pump, furnace, water heater, electrical panel, gas line — require a permit and inspection in California. Permits confirm the work is safe and code-compliant. Because rules differ between the counties and their cities, always confirm specifics with your local building department.
Why permits matter (it's not just red tape)
A permit and inspection protect you in concrete ways:
- Safety. An inspector verifies gas, electrical, and venting work is done correctly.
- Insurance. Unpermitted work can complicate or void claims after a fire or water loss.
- Resale. Buyers and appraisers look for permitted, documented improvements.
- Code compliance. California energy rules (Title 24) apply to many changeouts.
What typically requires a permit
This is a general guide for the Central Coast. Exact triggers and thresholds vary by jurisdiction — confirm with your building department before you assume.
| Type of work | Typically involves |
|---|---|
| AC or heat pump changeout | Permit + Title 24 compliance |
| Furnace replacement | Permit + combustion/venting inspection |
| Water heater (tank or tankless) | Permit + inspection |
| Electrical panel upgrade | Electrical permit + inspection |
| Gas line work | Permit + pressure test/inspection |
| Repipe / sewer line | Plumbing permit + inspection |
| EV charger / generator | Electrical permit + inspection |
Who issues your permit (the AHJ)
The "Authority Having Jurisdiction" (AHJ) depends on your address. Homes in unincorporated areas are usually permitted through the county building department; incorporated cities run their own. Homepatible works across both Santa Barbara County and San Luis Obispo County and their cities, so the right office differs from one home to the next.
[GATHER: confirm specific AHJ names, contacts, permit fees, and typical timelines for SLO County, Santa Barbara County, and the relevant city building departments.]
Title 24 and the refrigerant change
Two code topics come up constantly on changeouts: California Title 24 and the A2L refrigerant change, and whether an AC replacement needs a permit (it generally does). Both are explained in their own guides.
How Homepatible handles compliance
For permitted jobs, we pull the permit and coordinate the inspection as part of the work — so you get a properly documented, code-compliant installation without having to deal with the building department yourself.