§4.5 Chapter 4 · Leaks and repairs
Choosing a Licensed Plumber
Summary. Choosing a plumber in California starts with the license: look for a CSLB C-36 plumbing contractor, check the number at cslb.ca.gov, and keep any deposit within the state's cap.
Section 4.5 · revised · checked against district reports, code and agency pages · about 6 min to read
Supplier note: this section links to Central Plumbing HVAC, owned by the people who run North County Water & Pipes. Those links are labeled examples; no figure here depends on them. About these links
4.5.1 Which license should a plumber hold?
Look for a C-36 Plumbing license from the Contractors State License Board (CSLB). The CSLB describes a plumbing contractor as one who provides a supply of safe water, ample in volume and of suitable temperature, and who handles waste disposal, including on-site waste systems such as septic.
Some jobs near plumbing call for a different license or certificate. In San Diego County, only a C-57 well drilling contractor can apply for a permit to build, deepen or destroy a well, per the County's well permit FAQ. Backflow assembly tests must be done by certified testers under the State Water Board's rules, and each district runs its testing differently; see the backflow testing page §5.1.
If the job touches a water heater's venting, a relief valve or a pressure regulator, make sure the person doing it is licensed for the task. If you're unsure, call a licensed plumber.
4.5.2 When is a license required?
For most real plumbing jobs, always. Under AB 2622, which took effect January 1, 2025, unlicensed "minor work" is capped at less than $1,000 in combined labor and materials. The CSLB's bulletin on the change adds two conditions that override the dollar figure: if the work needs a permit of any kind, or if the person has employees, a license is required even below $1,000.
That covers a lot of plumbing. Repiping, reroutes around a slab, and replacing concealed pipe all need permits in unincorporated San Diego County, so they need a licensed contractor whatever the price. A handyman fixing a faucet for a small fee is a different case from a water heater swap or a main valve replacement.
| Rule | What it says | Source |
|---|---|---|
| License threshold | Labor plus materials of $1,000+ needs a license | CSLB, AB 2622 bulletin |
| Permit or employees | License required at any price | CSLB, AB 2622 bulletin |
| Down payment | No more than 10% or $1,000, whichever is less | CSLB consumer page |
| Right to cancel | 3 business days, or 5 if you're 65 or older | CSLB contracts guide |
| Service and repair contract | Signing one waives the cancel period | CSLB consumer brochure |
| License bond | $25,000 | CSLB bond page |
| Figure | What it is | Source |
|---|---|---|
| $1,000 | Contract value where unlicensed minor work stops, since 2025 | CSLB AB 2622 bulletin |
| 10% | Down payment ceiling, or $1,000 when that is lower | CSLB hiring page |
| 5 business days | Cancel window for home improvement buyers 65 or older | CSLB home improvement contracts guide |
| $25,000 | License bond each contractor must keep | CSLB bond requirements |
| 10% or $1,000 | Deposit limit on a home improvement contract, the lower one | CSLB consumer pages, AB 2622 bulletin and bond rules |
| 3 business days | Time to cancel a home improvement contract (5 if 65+) | CSLB consumer pages, AB 2622 bulletin and bond rules |
4.5.3 How do you check a license?
Look it up on cslb.ca.gov before you sign anything. The CSLB's hiring page says contractor ads must show the state license number, so ask for it if it's missing. Use the lookup to confirm the license is current and covers the right classification for your job.
Match the name. The business name on the estimate, the truck and the license record should line up. If the license is for a different classification, ask why; a general building license isn't the same as a C-36.
Workers' comp matters if anyone besides the owner will be in your house. The CSLB contracts guide says it's required by law when a contractor has employees. Every license also carries a $25,000 bond, per the CSLB's bond rules.
4.5.4 What should the contract say?
It should say what's being done, for how much, when, and on what terms you can cancel. For a home improvement job, the CSLB's guide says the contractor must give you three business days to cancel, or five if you're 65 or older.
Watch the deposit. A contractor can't ask for more than 10% of the contract price or $1,000, whichever is less, as a down payment. The only exception the CSLB names is a contractor with a blanket performance and payment bond on file.
Know which contract you're signing. A "service and repair" contract, typical for an urgent fix, gives up the three- or five-day cancellation right, according to the CSLB's consumer brochure. For a bigger, planned job such as a slab leak reroute §4.3, take time to compare written bids.
It also helps to see how plumbing firms present their services. As one example, Central Plumbing HVAC's plumbing page (Central Plumbing HVAC, owned by the people who run North County Water & Pipes) lists the kinds of work a plumbing company offers. That company is in Pennsylvania and does not work in North County, so treat the page only as a sample of service descriptions to compare against a local bid, not as a referral.
4.5.5 Who pulls the permit?
Ask before work starts, and get the answer in writing. Permit rules depend on where you live. Fallbrook, Bonsall, Rainbow and Valley Center are in unincorporated San Diego County, where the County's PDS 110 exemption list (rev. 1/1/2026) treats replacing defective concealed pipe as new work needing a permit and inspection.
Water heaters differ by jurisdiction. The County exempts a like-for-like replacement water heater when the installer is a licensed plumbing contractor. The City of Escondido's handout says any water heater replacement needs a permit. Vista is a city too, so check with its building department. More detail is on the water heater permits page §6.4.
Keep the permit number and the final inspection record. They matter when you sell the house.
4.5.6 Common questions
- Can a handyman legally fix a dripping faucet?
Yes, if the job is under $1,000 in combined labor and materials, needs no permit, and the person has no employees. Past any of those lines, California requires a licensed contractor.
- What license does a well driller need?
A C-57. In San Diego County only C-57 licensed drillers may apply for well construction or destruction permits.
- Is a $1,000 deposit allowed on a $5,000 repipe?
No. The cap is 10% of the contract price or $1,000, whichever is less, which would be $500 on a $5,000 job.
- Does the cancellation period apply to an emergency repair?
Not if you sign a service and repair contract. Per the CSLB, signing that kind of contract gives up the three-day (or five-day) right to cancel.
- What does a license bond cover?
The CSLB requires a $25,000 bond with every license. Ask the CSLB how a claim against a bond works if you have a dispute.
- Should the plumber's license number be on the estimate?
The CSLB says contractor ads must show the license number. Having it on the estimate too makes the lookup easy.
4.5.7 Sources for this section
This page rests on CSLB pages read October 2026: the C-36 classification, the AB 2622 bulletin, the hiring and contracts guides, the consumer brochure and the bond rules, plus San Diego County's PDS 110 list, its well permit FAQ and Escondido's water heater handout. We name no local plumbers, quote no prices and used no review sites.
Checked October 29, 2026. Inline links in the text above go to each source.