What a plumbing website in Los Angeles has to show: the license rules that apply, the counties you can serve, and a free audit of the site you have now.
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Businesses: plumbing, heating and air-conditioning contractors with paid staff in the Los Angeles-Long Beach-Anaheim, CA metro. Census County Business Patterns, 2023. Counties: Census metro and county estimates, 2024.
License
What Los Angeles asks of a plumbing business, and where your website comes in.
Checked 2026-10-05 at each source. Not legal advice: rules change, so check with the board before you rely on one.
State · California Contractors State License Board (CSLB)
C-36 plumbers put the license number on every ad, and the name, address and number on both sides of every work vehicle.
“Every person licensed pursuant to this chapter shall include his license number in: (a) all construction contracts; (b) subcontracts and calls for bid; and (c) all forms of advertising”
What it covers
“A plumbing contractor provides a means for a supply of safe water, ample in volume and of suitable temperature for the purpose intended and the proper disposal of fluid waste from the premises in all structures and fixed works.”
California · every trade
CSLB counts any website or post that asks for work on the internet as advertising.
CSLB, Advertising Guidelines for ContractorsCalifornia · every trade
Advertise only the work your classification covers, and never say you are bonded.
CSLB, Advertising Guidelines for ContractorsOn your website
Put the number in the footer of every page and beside every quote form, under the business name it is issued to. Read every page as an ad: that is the safe reading of these rules.
Service area
The Los Angeles-Long Beach-Anaheim, CA metro: 2 counties.
California licenses contractors state-wide through the CSLB, so these rules hold across both counties of the metro.
Census metro and county estimates, 2024Census County Business Patterns, 2023, by county
Plumbing, heating and air-conditioning contractors with paid staff, by county, 2023.
Free audit
Type your website and get a plain report, written for plumbing businesses. Then compare it with the license and service area notes above.
Written for plumbing businesses.
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