Do I need a permit for HVAC work in
Agoura Hills, California?

Agoura Hills HVAC permits — the key details

California Building Code Section 301.2 (as adopted by Agoura Hills) requires a mechanical permit for any HVAC installation, replacement, alteration, or repair involving ductwork, refrigerant lines, or equipment larger than the original unit. The city uses a 'replacement-in-kind' exemption — swapping an old furnace or AC condenser for identical capacity and efficiency (same tonnage, same AFUE/SEER2) can sometimes skip full permits if ducting is untouched — but this exemption is narrowly construed and the Building Department issues a separate 'permit by notice' form (not a full mechanical permit) that still costs $75–$150. The critical detail unique to Agoura Hills is that the city interprets 'identical' strictly: if your new unit's electrical footprint differs (e.g., a modulating furnace requiring new thermostat wiring), or if you're upgrading SEER2 ratings to meet Title 24 minimums, a full mechanical permit is required. Owner-builders can file the application themselves (California Business & Professions Code § 7044 allows this), but all refrigerant handling, evacuation, and charging must be performed by an EPA-certified technician holding a Section 608 certification — this is a state requirement that Agoura Hills enforces at inspection. Electrical work tied to the HVAC (new disconnect, panel modifications, low-voltage thermostat wiring beyond simple swap) requires a licensed electrician and a separate electrical permit.