When do you need a plumbing permit in Mesa, and what is exempt? City Code 4-1-4

Subsection (A) requires anyone who intends to "erect, install, enlarge, alter, repair, remove, convert, or replace" a plumbing or gas system regulated by the chapter or the technical codes to apply to the Building Safety Director first and obtain the permit. It also exempts a few groups: several school districts, governmental entities immune as a matter of law, and Annual Facilities Permit holders (see the annual permit page).

Subsection (B)5 lists the plumbing work that needs no permit. The items that matter to most jobs are:

• Stopping leaks, (a). Stopping leaks in drains, water, soil, waste or vent pipe is exempt, but not defective concealed pipe that has to be removed and replaced.
• Stoppages and reinstalling toilets, (b). Clearing stoppages, repairing leaks in pipes, valves or fixtures, and removing and reinstalling water closets are exempt, but not replacing or rearranging valves, pipes or fixtures.
• Water heaters, (c) to (e). Covered on the water heater page. Gas water heater swaps of equal or lower Btu/cfh rating are exempt under (B)3(c) and (e), provided the serving gas utility is notified before the unit is energized.
• Water treatment appliances, (h) and (i). Replacing or newly installing potable water conditioning or treating appliances, and minor connection changes, is exempt in homes, and in individual tenant spaces outside industries regulated by Title 8, Chapters 1 and 4.
• Solar water and pool heating, (j) and (k). Exempt in homes for an individual dwelling unit.
• Exterior water line, (l). "Equal replacement of exterior potable water supply line to a building" is exempt, but not work in industries regulated by Title 8, Chapters 1 and 4, and not work in a public utility easement or Mesa right-of-way.
• Exterior sewer line, (m). The same test for equal replacement of the exterior sanitary drainage line.

The lead-in to (B) adds that an exemption does not authorize work that violates the chapter, the technical codes or other law.

Other subsections shape the process:

• Emergency repairs, (C). If a repair that needs a permit must be done in an emergency, the application is due within the next working business day.
• Ordinary repairs, (D). No application is needed for ordinary repairs, but that does not include addition, alteration, replacement or relocation of any water supply, sewer, drainage, soil, waste, vent or gas piping, unless the work is on the (B) exempt list.
• Application, (H). A written application describes the work, the site, the use, the valuation and the applicant, with construction documents where required, and proof of a valid contractor's license and bond. An application is treated as abandoned 180 days after filing unless pursued in good faith, with extensions of up to 90 days each.
• Holds, (H)4. The city may withhold a permit while the applicant or contractor is delinquent in city privilege and excise taxes or other accounts.

• Equal replacement. Replacing a line with one that does the same job, in the same place. The code does not define it further.
• Public utility easement (PUE). A strip of land where the city or a utility holds rights. Work in one leaves the exemption behind.
• Building Safety Director. The city official who issues permits under this chapter.
• Technical codes. The 2024 IPC and other adopted codes that set how the work must be done.

Anyone doing plumbing or gas work in Mesa. Commercial jobs that change layout, add fixtures or change use usually fall outside the exempt list and go through plan review. The tenant improvement track is on the 4-1-4 permit-by-inspection page.

A restaurant with a stoppage. The plumber clears the line and stops a leak on an exposed trap. No permit is needed. When the same plumber replaces a valve or rearranges fixtures to fit a new hand sink, the permit line is crossed.

An equal water line replacement. An owner replaces the water line to a building with the same size on the lot. It is exempt if it stays on the property. If the trench runs through a public utility easement, the exemption does not apply.

The edge case. An application sits for six months while the tenant finishes financing. The application is deemed abandoned at 180 days unless pursued in good faith, and extensions are granted in periods of up to 90 days on written request.

1. 1Compare your job with the (B)5 list, including its exclusions.
2. 2If it is not exempt, apply through the city's permit process with the description, valuation and contractor license information.
3. 3If any work is in the street, an alley or a public easement, plan the right-of-way permit too.
4. 4For an emergency repair that needs a permit, apply by the next business day.
5. 5Keep the application moving, since it is treated as abandoned at 180 days.

• "Exempt means anything goes." The code still applies to exempt work.
• "Replacing a valve is a repair." The exemption for leak and stoppage repairs excludes replacing or rearranging valves, pipes or fixtures.
• "Sewer replacement never needs a permit." It is exempt only for equal replacement outside a public utility easement or right-of-way.
• "An emergency erases the permit." It only delays the application until the next working business day.