Before You Build in Phoenix, AZ: Permit & Rule Checklist (2026)

A Phoenix building permit is not required for fences 3 feet or less in height, or retaining walls 3 feet or less without a surcharge. Fences over 3 feet (up to 7 feet) require a building permit demonstrating zoning and site-drainage compliance, and retaining walls over 3 feet always require a permit.

Phoenix requires a permit for any retaining wall over 3 feet (top of footing to top of wall), and for 3-foot-or-less walls burdened by a surcharge from a house, road, pool, or that support a fence. Structural design calculations are required for retaining walls over 3 feet, and combination wall-and-fence structures over 9 feet need zoning approval.

Phoenix and Arizona law (ARS §36-1681) require all swimming pools, spas, and hot tubs with water 24 inches or more deep to have both exterior and interior barriers. Exterior fences must be at least 5 feet high with self-closing, self-latching gates. Interior barriers between the home and pool are required for properties with children under 6.

Phoenix limits fences and freestanding walls in a required front-yard setback to 40 inches, and allows up to 6 feet within or bounding a rear or side yard. Walls up to 8 feet are allowed along side and rear yards abutting an arterial street or as freeway noise-mitigation walls.

Phoenix does not have a specific fence dispute resolution ordinance between neighbors. Arizona follows common law for shared fence costs and disputes. There is no statutory requirement to share fence costs with neighbors. Property owners building a fence must stay on their own property or obtain neighbor agreement. Spite fence claims are handled under common law nuisance principles.

Building a swimming pool, spa, or pool barrier in Phoenix requires a building permit from the Planning & Development Department, with two mandatory inspections (pre-gunite and pre-plaster). Only small above-grade prefabricated pools (≤ 5,000 gallons) are exempt from the structure permit, and even those still require a separate permit for the pool barrier.

Above-ground pools in Phoenix are subject to the same barrier requirements as in-ground pools under ARS §36-1681. Any pool with water 18+ inches deep and wider than 8 feet must be enclosed by at least a 5-foot wall or fence. Building permits are typically required for permanent above-ground pool installations.

Phoenix enforces strict pool safety per ARS §36-1681 and the federal VGB Act. Anti-entrapment drains, barriers, alarms, and depth markers required.

Hot tubs and spas in Phoenix must meet barrier requirements under ARS §36-1681 if they contain water 24+ inches deep. However, hot tubs not more than 8 feet wide may use a lockable ASTM F1346-compliant safety cover in lieu of interior barriers, as long as exterior perimeter fencing exists.

Phoenix requires every residential pool, spa, or hot tub holding 18 inches or more of water to be enclosed by a barrier at least five feet (60 inches) high with self-closing, self-latching gates, plus a separate inner-yard barrier between the dwelling and the pool. The rules are set in the 2024 International Swimming Pool and Spa Code as amended by Phoenix Ordinance G-7397, building on Ordinance G-3316 adopted May 4, 1990.

Phoenix permits up to two accessory dwelling units (one attached, one detached) on a single-family detached lot, with a third allowed on lots of one acre or more when one ADU is affordable housing. A detached ADU may sit as close as 5 feet from a street side property line and 3 feet from an interior side or rear line under Zoning Ordinance Section 706.A.

Phoenix allows converting an existing garage or carport into an Accessory Dwelling Unit, but the conversion must establish new equivalent off-street parking elsewhere on the lot in dustproof condition, and that replacement parking may not be placed in the front-yard setback. A converted garage ADU is regulated under Zoning Ordinance Section 706.A and requires building permits.

In Phoenix, one-story detached tool and storage sheds, playhouses and similar uses do not require a building permit if their aggregate floor area does not exceed 200 square feet, per Phoenix Building Construction Code Section 105.2.1. Sheds must still meet zoning setbacks of at least 3 feet from a side or rear property line under Zoning Ordinance Section 706.B.

Phoenix Zoning Ordinance Sections 701 and 706 regulate carports as accessory structures. Open carports may project into required front yards up to 5 feet, into side yards to within 3 feet of the lot line, and into rear yards to within 3 feet of a common rear lot line. Detached ADUs may include an integrated carport.

Phoenix allows accessory dwelling units (ADUs) under Zoning Ordinance Section 706, which can function as tiny homes. Up to 2 ADUs are permitted per single-family lot (one attached, one detached). ADUs are capped at 75% of the primary dwelling's floor area, with a 1,000 sq ft maximum on lots up to 10,000 sq ft. HOAs may impose additional restrictions.

Phoenix allows backyard fire pits and portable outdoor fireplaces, but the Phoenix Fire Code (2018/2024 IFC as amended) Section 307 sets minimum clearances and requires constant attendance, and the Maricopa County Air Quality Department prohibits wood burning in any fire pit or chiminea on a declared No Burn Day.

Open burning in Phoenix requires an operational permit from the Phoenix Fire Department under Fire Code section 105.5.36, and the Maricopa County Air Quality Department separately bans burning household trash and yard waste year-round and prohibits all outdoor wood burning on declared No Burn Days under Rule 314.

Phoenix City Code Sec. 23-32 makes it unlawful to let trees, shrubs or bushes growing on your property interfere with traffic signs, pedestrians, bicyclists, vehicles, or drainage in any public right-of-way, and Sec. 31-13 limits obstructions in the sight-visibility triangle at residential intersections.

Phoenix Municipal Code Chapter 34 and the Tree and Shade Ordinance require permits for removing trees over 6 inches in diameter. Protected species include native trees such as palo verde, mesquite, and ironwood. Arizona law requires the Department of Agriculture to be notified 20-60 days before destroying protected native plants.

Phoenix has no fixed day-of-week outdoor watering schedule; instead, Phoenix City Code Chapter 37 (sections 37-126 through 37-130, the Drought Management Plan) authorizes the Water Services Director to declare progressive drought stages, and watering restrictions become mandatory only at Stage 2 (Water Warning) or higher. Turf in the public right-of-way is banned under Arizona state law.