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When does an Arizona contractor need a license?

Source: Arizona Plumbing Help (arizonaplumbinghelp.com), part of the Local Help Stations network (localhelpstations.com). Last updated November 2, 2026.

Plumbing contractors in Arizona must hold a contractor license from the Registrar of Contractors unless an exemption applies (A.R.S. 32-1151). Check the license and its classification on ROC's contractor search before you hire. (source: Arizona State Legislature)

A person without a contractor license may do a job under $1,000 in total (labor, materials and everything else) only if the work is casual or minor (A.R.S. 32-1121(A)(14)). The exemption does not apply when the work needs a local building permit (A.R.S. 32-1121(A)(14)(a)), when the job is part of a larger operation or split into smaller contracts (A.R.S. 32-1121(A)(14)(b)), or when the person uses any advertising to the public that does not include the words "not a licensed contractor" (A.R.S. 32-1121(A)(14)(c)). (source: Arizona State Legislature)

The under $1,000 exemption never covers work that connects to natural gas, propane or other petroleum or gaseous fuel, including installing, maintaining or repairing appliances, or fire safety work such as hardwired or interconnected smoke alarms and fire sprinklers (A.R.S. 32-1121(D)). So an unlicensed handyman may not swap a gas water heater or gas furnace, even for under $1,000. An owner doing their own work under the owner exemption is a separate rule. (source: Arizona State Legislature)

ROC's License Classifications FAQ puts it this way: generally, if labor and materials exceed $1,000 or a permit is required (regardless of the price of labor and materials), then a license is required (ARS 32-1121). (source: Arizona Registrar of Contractors)

License classes

ROC residential plumbing licenses: R-37 Plumbing, Including Solar. Dual (commercial and residential) licenses: CR-37 Plumbing, CR-77 Plumbing Including Solar and CR-78 Solar Plumbing, Liquid Systems Only. ROC says no new R-37R licenses will be issued. (source: Arizona Registrar of Contractors)

The residential classes and their scopes of work are also in Arizona Administrative Code R4-9-103. The Secretary of State copy we read (Supp. 23-2) covers rules filed through March 31, 2022, so it may be dated; ROC's License Classifications page is the current reference. (source: Arizona Secretary of State)

Penalties

Acting as a contractor without a license is a class 1 misdemeanor. The fine is at least $1,000 for a first offense and at least $2,000 for a second or later offense (A.R.S. 32-1164). Getting a permit or hiring someone on a project is accepted in court as prima facie evidence of a contract (A.R.S. 32-1151). (source: Arizona State Legislature)

On this site: Do I need a permit to replace a water heater in Arizona? · Tankless water heater permits in Arizona · Gas line permits in Arizona cities · Plumbing jobs that need no permit in Arizona cities · Can I do my own plumbing in Arizona? · When does an Arizona contractor need a license? · Arizona contractor contract rules · How to check an Arizona contractor and complain · The Arizona Residential Contractors' Recovery Fund · Cities · FAQ · Sources

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