The County rule
The County's adoptive ordinance (PDS 110, rev. 1 January 2026, read 23 October 2026) requires a permit to "erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system". It then lists what needs no mechanical permit:
| Exempt in the County (PDS 110) | Not on the list, so it needs a permit |
|---|---|
| "Replacing a faulty control, valve, drier or filter ... or repairing the equipment, as long as the work does not require removing the equipment from its installed position" | Replacing the furnace, condenser, air handler or heat pump |
| "Installing a temperature control, repairing a leak or recharging a refrigeration compressor or system" | Adding a ducted system or a ductless mini-split |
| A portable heater, ventilation equipment, cooling unit or evaporative cooler | New or altered ductwork |
| "Replacing any part that does not alter its approval or make it unsafe" | A new circuit or panel upgrade for the unit (electrical permit) |
The dividing line is removal: if the unit comes out, it is permit work. The ordinance adds that "It is the responsibility of any person performing the work and any person hiring another person to perform the work to ascertain whether a permit is required".
Who pulls it
Usually a contractor holding CSLB's C-20 Warm-Air Heating, Ventilating and Air-Conditioning classification (CSLB). Check it on Check a License. 87.2% of the 218 HVAC firms on County permits matched an active CSLB license in our file.
A homeowner can file as owner-builder by initialing and signing the County's Owner-Builder Acknowledgement (PDS 421). It says the owner is "the responsible party of record on the permit" and may be treated as an employer if they pay anyone other than licensed contractors on a job of $500 or more.
How to apply
- Check the parcel is unincorporated (Fallbrook, Ramona, Lakeside, Spring Valley, Alpine and the rest); the 18 incorporated cities permit their own.
- Apply in Accela Citizen Access under PDS. Replacements have their own online types in the County's file: "HVAC Change Out" and "Electric Heat Pump/AC R&R"; a panel upgrade is filed separately as "Existing Main Svc Upgrade (Max 400A)".
- Inspections and final. County permits expire if work does not start and receive a valid inspection within two years of issue, or if work is suspended for 180 days; when inspections will be more than 180 days apart, a progress inspection keeps the permit active (PDS 807).
What it costs
From the County's fee schedule (PDS 613, effective 10 July 2026):
| Permit | Fee |
|---|---|
| Mechanical only | $392 |
| Electrical and mechanical | $498 |
| Plumbing and mechanical | $498 |
| Electrical, plumbing and mechanical | $734 |
| Re-inspection / progress inspection | $205 |
| Missed appointment | $282 |
These are flat fees, not a share of the job price, so a $6,000 condenser swap and a $25,000 heat-pump system pay the same mechanical fee. A heat pump that also needs electrical work falls on the $498 combined line. The $205 re-inspection is the cost to avoid: PDS 807 says it can be charged when work is not ready, the permit card is not posted, the approved plans are not on site, or the inspector cannot get access.
What 4,924 County HVAC permits show
| Measure | Unincorporated San Diego County HVAC |
|---|---|
| Residential permits, October 2023 to September 2026 | 4,924 |
| Firms | 218 |
| Firms with a permit in the last 12 months | 120 |
| Closed (permits a year or more old) | 59.3% |
| Usual days from issue to final | 163 |
| Firms with 10+ permits closing under 70% | 25 of 40 |
| 10th / 90th-percentile firm (10+ permits) | 22.6% / 81.6% |
| Busiest / quietest month | August (147) / February (67) |
HVAC is where County permits stall. Only 59.3% closed, against 82.5% for solar, and 25 of the 40 firms with 10 or more permits closed under 70%; the 10th-percentile firm closed 22.6%. A change-out with no final is an open permit on your parcel that can expire. Put "final inspection passed" in the contract and hold the last payment until it shows in Accela. Filing peaks in August (index 147). County HVAC permits carry no job value; national prices are in HVAC replacement cost.
See every County HVAC contractor by permits closed →
Next steps
Compare firms on the San Diego County HVAC list; heat pump versus furnace in the County's own numbers is in heat pump vs furnace in San Diego County. License steps: San Diego County contractor license lookup; past permits: San Diego County building permit search; monthly counts: San Diego County permit statistics. Other places: do I need a permit for HVAC replacement.
What this does not tell you
"Closed" means the permit reached a completed status; a low share can mean the final was never booked rather than failed work. The County's HVAC trade in our file also includes mechanical-only permits that are not change-outs. Unincorporated county only.
How we know this
Permit rules, exemptions, expiration, owner-builder terms and fees are quoted from County of San Diego PDS documents PDS 110, 421, 613 and 807, read 23 October 2026; permit type names are as written in the County's permit file; license class from CSLB. Counts are County PDS residential HVAC permits, October 2023 to September 2026; "closed" uses permits a year or more old, days to final is the median from issue, and license status is our match to CSLB records.
Numbers come from San Diego County Planning & Development Services building permits on homes in the unincorporated county (the County's open-data permit, contractor and status-history files), data through October 20, 2026. Nobody paid to be on this page and nobody can.
Questions
- Do I need a permit to replace an AC or furnace in San Diego County?
Yes. The County's adoptive ordinance (PDS 110) requires a permit to replace any mechanical system it regulates. Its mechanical exemptions cover repairs that do not remove the equipment from its installed position, recharging refrigerant, controls and portable units, not a change-out.
- How much is an HVAC permit in San Diego County?
The County's fee schedule effective 10 July 2026 lists $392 for a mechanical-only permit, $498 for electrical and mechanical together (common with a heat pump), and $734 for electrical, plumbing and mechanical. A re-inspection is $205.
- How long does an HVAC permit take to final in San Diego County?
The usual County HVAC permit in our file reached final 163 days after issue, and only 59.3% of those a year or more old had closed.
- Does a heat pump need a different permit in San Diego County?
The County files heat-pump replacements under their own online type, 'Electric Heat Pump/AC R&R', separate from the standard 'HVAC Change Out'. If the panel also needs upgrading, that is a separate electrical permit.
- Can a homeowner pull an HVAC permit in San Diego County?
Yes, as owner-builder, after signing the County's Owner-Builder Acknowledgement (PDS 421), which makes you the responsible party of record. A contractor doing the work needs a CSLB C-20 license.
Build your own list
Every firm with that kind of permit on record. Pick what you value. The list moves.
Related guides
- Ames building permit search: how to look up permits on an address
- Do I need an HVAC permit in Ames? Yes: what is exempt, homeowner permits, the $56.23 base fee and inspections
- Do I need an HVAC permit in Anaheim? The mechanical permit for a furnace or AC change-out, fees and inspections
- Do I need an HVAC permit in Arlington, VA? The like-for-like exemption, the gas exception and zoning
For one city
- Building Permit Requirements per Adoptive Ordinance (PDS 110, rev. 01/01/2026) — County of San Diego PDS (accessed 2026-10-23)
- Building Fee Schedule (PDS 613, effective 07/10/2026) — County of San Diego PDS (accessed 2026-10-23)
- Online Solar Photovoltaic Permit: Important Customer Information (PDS 807, permit expiration text) — County of San Diego PDS (accessed 2026-10-23)
- Owner-Builder Information (PDS 421) — County of San Diego PDS (accessed 2026-10-23)
- Accela Citizen Access — County of San Diego (2026-10-23)
- CSLB Licensing Classifications (C-20 Warm-Air Heating, Ventilating and Air-Conditioning) (2026-10-20)
- Check a License — CSLB (2026-10-22)