San Francisco plumbing permits and rules
Source: California Plumbing Help (californiaplumbinghelp.com), part of the Local Help Stations network (localhelpstations.com). Last updated November 2, 2026.
Plumbing permits in San Francisco
San Francisco requires a C4 or C36 license for a contractor to get a plumbing permit. Only owners of stand-alone single-family homes (R-3 occupancy) may apply for a plumbing permit to do the work themselves, and must visit the Permit Center to talk to an inspector within a week. (source: City and County of San Francisco)
Statewide rules that apply here
Plumbing contractors are licensed by CSLB in the C-36 Plumbing classification. A C-36 contractor provides safe water supply and disposal of fluid waste, including piping, storage tanks and venting for gases and liquids. (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 water heater 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 a water heater in California? · California water heater strapping law · California water heater installation rules cities inspect · Plumbing permit costs in California cities · Plumbing jobs that need no permit in California cities · Can I do my own plumbing 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 and County of San Francisco: Apply for a plumbing and mechanical permit (checked November 2, 2026)
- Contractors State License Board (CSLB): C-36 Plumbing 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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