What's Required in San Diego
- Mechanical permit before any HVAC system is installed, altered, replaced or repaired (SDMC 129.0402(b)); in-place repairs, controls, filters, leaks and recharging are exempt
- Simple Permit online with no plans for single-family, duplex and townhouse homes outside historic districts
- Permit issued only to a California-licensed contractor in the trade or the property owner or lessee (SDMC 129.0406)
- Owner-builders upload the signed Owner-Builder Verification Form DS-3042; tenants cannot sign
- HERS rating by a certified rater for major HVAC changes or replacements, more than 40 ft of new duct, or replaced units serving more than 40 ft of duct in unconditioned space
- At-grade equipment in side or rear yards at least 4 ft from the property line unless sound attenuation is demonstrated
- Structural calculations for equipment over 400 lb or with its center of gravity more than 4 ft above the base; building permit if the structure is altered
- Smoke and carbon monoxide alarms brought to code whenever a permit is pulled in an existing dwelling
- Historic properties file a standalone mechanical permit with plans
Do You Need a Permit to Replace an AC or Furnace in San Diego?
Yes, for the equipment. San Diego Municipal Code section 129.0402(b) requires a mechanical permit before any heating, ventilating, air conditioning or refrigeration system is installed, altered, replaced or repaired, and the Development Services Department (DSD) handout lists installing HVAC systems among the jobs that need one. The exemptions in section 129.0404 are the maintenance layer: repairs that do not remove the equipment from its installed position, replacing faulty controls, valves, driers or filters, installing thermostats, fixing leaks and recharging refrigerant, plus portable heaters, coolers and evaporative coolers, all need no permit. Swapping a condensing unit, furnace, air handler, heat pump or mini-split is a replacement and is permitted. For a single-family home, duplex or townhouse outside a historic district it is a Simple Permit: a no-plan mechanical permit applied for online, with the Simple Permits page naming installations of forced air units and air conditioner units and replacement of furnaces.
San Diego HVAC Rules by Scenario
| What you are doing | City filing | Rule |
|---|---|---|
| Thermostat, capacitor, control board, filter, refrigerant recharge or leak repair, unit left in place | None | SDMC 129.0404(a) |
| Replacing the outdoor condensing unit only | Mechanical Simple Permit, $131.52 | IB 103 Table 1B |
| Replacing a furnace or forced-air unit | Mechanical Simple Permit, $176.57 | IB 103 Table 1B |
| Full split-system change-out: furnace or air handler plus condenser | Mechanical Simple Permit, $176.57 + $131.52 = $308.09 | IB 103 Table 1B |
| Heat pump package unit, or a mini-split (first head) | Mechanical Simple Permit, $176.57; each added air handler or head $52.39 | IB 103 Table 1B |
| Replacement with more than 40 ft of duct in unconditioned space, or new ductwork over 40 ft | Same permit plus a HERS rating by a certified rater before final | IB 103 section I and footnote 2 |
| Rooftop unit over 400 lb, or equipment needing new structural support; historic property | Plan permit with structural calculations; historic sites need plans | IB 103 |
How Much Does an HVAC Permit Cost in San Diego?
Information Bulletin 103, Table 1B, prices residential mechanical work per item and marks each as Simple Permit eligible: condensing unit for HVAC $131.52; furnace or forced-air unit $176.57; heat pump package unit $176.57; air handler, mini-split or humidifier $176.57 with $52.39 for each additional unit; exhaust fan $105.98; a gas system or meter, if the gas line is altered, $264.25 per five outlets. So a like-for-like condenser swap is about $131.52 and a full furnace-and-condenser change-out about $308.09. Because a Simple Permit has no plan review, the $737.00 General Plan Maintenance Fee and the $12.16 mapping fee that attach to plan-checked projects do not apply. IB 103 notes that records fees are non-refundable, so expect small add-ons on the invoice. A stand-alone mechanical permit expires if no inspection is passed within 180 days and cannot run past two years.
HERS Testing and Placement Rules
IB 103 requires a Home Energy Rating System evaluation to get final inspection approval for major HVAC system changes or replacements and for installation of more than 40 feet of new ductwork, and its footnote to the furnace and condensing unit lines says replacement of these systems requires a HERS rating when more than 40 feet of duct is in unconditioned space. A certified, independent HERS rater tests the system and issues the certificate; DSD keeps a directory of city-certified raters. Zoning also governs where the condenser sits: IB 103 says air conditioner units may not be installed in required side or rear yards unless they meet section 131.0461(a)(5), which allows at-grade equipment in those yards at least 4 feet from the property line, or with no setback where sound attenuation meets the city's noise limits. Equipment weighing over 400 pounds or with its center of gravity more than 4 feet above the base needs structural calculations, and a building permit is required when the floor, roof or platform must be altered to carry it.
Who Pulls the Permit
Section 129.0406 lets a plumbing/mechanical permit be issued to a California-licensed contractor in the trade or to the property owner or lessee; HVAC contractors may extend gas piping only to the equipment they install. Licensed contractors receive the Simple Permit as soon as the invoice is paid; homeowners upload the signed Owner-Builder Verification Form DS-3042 and normally receive it within two business days. Whenever a permit is pulled in an existing home, smoke and carbon monoxide alarms must be brought to code, and inspections are scheduled online or at 858-581-7111 by 10 p.m. the night before.
How to Get a HVAC Permit in San Diego
Confirm the scope needs a permit
Equipment replacement does; in-place repairs, controls and recharging do not.
Apply for a Simple Permit online
Select the mechanical items on the DSD portal and upload DS-3042 if you are the owner-builder; historic properties file with plans instead.
Pay the invoice
$131.52 for a condenser, $176.57 for a furnace or heat pump; contractors get the permit on payment, homeowners in about two business days.
Install and, if required, get the HERS test
Place the condenser at least 4 ft from the property line and have a certified HERS rater test duct and system performance when the thresholds apply.
Schedule the final inspection
Book online or at 858-581-7111; pass an inspection within 180 days so the permit does not expire.