Who can pull a commercial plumbing permit in Arizona?

Three ROC plumbing classifications cover commercial work. C-37 is commercial plumbing. CR-37 is the dual license that covers both commercial and residential plumbing. C-77 is plumbing including solar. The state rule defines C-37 as a license to "install, alter, and repair all plumbing when performed solely within property lines and not on public easements or right-of-ways, except as hereinafter provided."

The property-line limit matters on commercial sites. Work in the street or an easement, like a sewer tap, falls under different rules and sometimes a different license class. Our page on permits to dig in the right of way walks through that split.

No, not for a commercial building. Arizona's owner exemption in A.R.S. 32-1121 covers owners who improve their own property only if the structure is "intended for occupancy solely by the owner and are not intended for occupancy by members of the public as the owner's employees or business visitors." It also excludes anything built for sale or rent. If the owner sells or rents the structure within a year of completion, the statute treats that as evidence it was built for sale or rent.

Phoenix adds a second layer. Its administrative code says any permitted plumbing work has to be done by a licensed journeyman or an apprentice, unless the person is a state-licensed contractor or is the owner-occupant of a single-family home (private water services and sewers have their own carve-out). A commercial owner or tenant fits none of those.

Here's who that leaves on a typical property:

• Landlord or property manager: hire a licensed plumbing contractor to do the work, and make sure the application names that contractor.
• Business tenant: the same. Your lease decides who pays, but the license rule doesn't change (see tenant vs. landlord plumbing responsibility).
• General contractor on a build-out: the plumbing goes to a licensed plumbing subcontractor. The city's online-permit guidance says permits "can be obtained by applicants with licensed contractors," so either the GC or the plumbing contractor may hold it. Ask which before work starts.

### What do people get wrong about who can pull the permit?

Three beliefs come up again and again, and each one is wrong.

• Myth: Only the plumbing contractor can pull the permit. Not so. Section 105.1 lets the owner or the owner's authorized agent apply. What the owner cannot do is the plumbing itself, and the application has to name the licensed contractor who will.
• Myth: A B-1 general contractor can do the plumbing. Not so. The state rule says plumbing under a B-1 license "must be subcontracted to an appropriately licensed contractor."
• Myth: An owner can plumb their own commercial building. Not so. The owner exemption in A.R.S. 32-1121 does not reach a structure that members of the public use as the owner's employees or business visitors.

Phoenix has a workaround built for that. A building maintenance registration exempts the holder from the normal permit requirement for Level 1 alterations and for repair and maintenance of plumbing equipment in buildings the registrant owns and controls. The work has to be performed or supervised by a licensed plumbing supervisor, and city inspection is still required before anything gets covered up. A large owner-operator with full-time staff can qualify. A landlord with one handyman can't.

Through the city's SHAPE PHX portal, which added commercial plan review and inspections on April 27, 2026. A business with more than one employee asks the SHAPE PHX team at shapephx@phoenix.gov to set up one business account.

Small jobs are quick. The city lets licensed contractors buy commercial permits online, with no plan review, for a few minor scopes: replacing a water heater, a minor plumbing repipe and gas pipe repair. The contractor has to verify in advance that the building's plumbing can handle the change. Anything bigger goes through plan review with drawings, which is where a tenant improvement lives. Our page on commercial tenant improvement plumbing covers that path.

### What happens after the permit is issued?

The permit is the start of the paperwork, not the end. Three Phoenix rules matter to an owner or tenant who is paying for the job:

• The work must stay visible until it is inspected. Phoenix's amended Section 110.1 puts the duty on the owner or the owner's authorized agent to keep permitted work visible and accessible until the inspector approves it. If drywall, a slab or a ceiling goes up first, the city can require the material to be removed, and the city is not liable for the cost of removing or replacing it. Ask your contractor to confirm the inspection is passed before the walls close.
• Permits expire. Under Section 105.5, a permit expires 24 months after it is issued unless the building official grants an extension. Extensions are granted in writing, for not more than one year each, and the request has to be made before the permit expires and show justifiable cause. An extension carries a non-refundable fee. A permit that has already expired can be reinstated for up to a year only if the plans have not changed and it expired less than a year before the request. A long tenant improvement that stalls over a lease dispute can lose its permit this way.
• Inspection fees cover the customary inspections. Section 109.7 says permit fees pay for customary inspections. Inspections requested on weekends, holidays or outside regular hours carry an additional fee, and a re-inspection fee can be charged if the work is not ready when the inspector arrives, if corrections were not made, or if plans are not on site. Make sure the plumber's schedule and the job's real progress line up.

Ask your plumber at the start who will schedule inspections, who will be on site for them, and who keeps the approved plans and the final inspection record. That record is what a buyer, lender or insurer will ask for later.

Look the contractor up on the ROC site and confirm three things: the license is active, the classification says C-37 or CR-37 (or C-77), and the bond is in force. Our step-by-step is in how to verify a plumber's ROC license, and licensed contractor vs. handyman explains why a handyman can't fill this seat.

Also ask who the permit will be issued under and get the permit number in writing once it is pulled. You can use that number to confirm on the city's portal that the job is on the books, that the inspections you expect are scheduled, and that the scope on the permit matches the scope in your contract. A permit for a smaller job than the one being built is a warning sign.

If a contractor offers to skip the permit on commercial work, that's your cue to move on. The owner is the one who lives with an unpermitted job when it comes up at a sale, an insurance claim or the next tenant's inspection.

### Where can you read the rule yourself?

Full text and source: the Phoenix amendments to the 2024 IBC Chapter 1 (Sections 105.1, 118 and 119, in the file 2024-ibc-ch1.pdf, linked in the sources above) cover who applies, the maintenance registration and who may do permitted plumbing. The C-37 definition and the B-1 subcontracting rule are in Arizona Administrative Code R4-9-102, and the owner exemption is A.R.S. 32-1121. Read the sections themselves before you sign a contract, since the city can update its amendments.

If you are adding a restroom to a warehouse, our page on that project explains the fixture count and the plumbing work.

HQ is licensed and insured and gives free estimates on commercial plumbing.