San Diego heating and air conditioning permits and rules
Source: California HVAC Help (californiahvachelp.com), part of the Local Help Stations network (localhelpstations.com). Last updated November 2, 2026.
Heating and air conditioning permits in San Diego
San Diego says no part of a heating, ventilating, air conditioning or refrigeration system may be installed, altered, replaced or repaired without a Mechanical Permit, except as exempted. (source: City of San Diego Development Services)
Many projects qualify for a Simple "No-Plan" Mechanical Permit, which homeowners, property owners and licensed contractors can get. San Diego's Information Bulletin 103 lists which projects qualify. (source: City of San Diego Development Services)
Homeowners normally receive a simple permit within two business days after submitting the Owner-Builder Verification Form DS-3042. (source: City of San Diego Development Services)
Statewide rules that apply here
Heating and air conditioning contractors are licensed by CSLB in the C-20 Warm-Air Heating, Ventilating and Air-Conditioning classification. A C-20 contractor installs, maintains, services and repairs warm-air heating systems, water heating heat pumps, ventilating systems and air conditioning systems with their ducts and controls. (source: Contractors State License Board)
The contractor license law does not apply to work under $1,000 in total (labor, materials and everything else) that is casual, minor or inconsequential and does not need a building permit. The exemption is lost if the job is split up to get under $1,000, if the person advertises as a contractor, or if they employ anyone to help (B&P 7048). AB 2622, approved in September 2024, raised this limit from $500 to $1,000, and the section was amended again effective January 1, 2026. (source: California Legislature) (source: California Legislature)
See AC permits in other cities, doing your own work and checking a license.
Other cities: Los Angeles · San Diego · San Jose · San Francisco · Sacramento · Fresno · Long Beach · Oakland
On this site: Do I need a permit to replace an AC or furnace in California? · California energy code testing for AC changeouts · Mini-split permits in California · HVAC permit costs in California cities · HVAC work that needs no permit in California cities · Can I do my own HVAC work in California? · When does a California contractor need a license? · California home improvement contract and payment rules · How to check a California contractor and complain · Cities · FAQ · Sources
Sources
- City of San Diego Development Services: Mechanical Permit (checked November 2, 2026)
- City of San Diego Development Services: Simple Permits (checked November 2, 2026)
- Contractors State License Board (CSLB): C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor classification (checked November 2, 2026)
- California Legislature (California Legislative Information): Business and Professions Code 7048 (minor work exemption) (checked November 2, 2026)
- California Legislature (California Legislative Information): Assembly Bill 2622 (2024), Chapter 240: Contractors: exemptions (checked November 2, 2026)
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