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

Block walls and masonry fences typically require building permits in Phoenix. Wood fences under 6 feet may be exempt. Pool barriers must meet ARS §36-1681.

Phoenix requires building permits for retaining walls over 3 feet in height. Combinations of retaining walls and fences always require structural design calculations. Combined wall-fence structures exceeding 9 feet need zoning approval. Walls 3 feet or less are exempt from permits unless on hillside lots.

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 Zoning Ordinance Section 703 regulates fence heights. Front-yard fences are limited to 40 inches (3 feet 4 inches). Side and rear yard fences enclosing private yards may be up to 6 feet. Properties in Historic Preservation Overlay Districts have a 3-foot front-yard limit with a Certificate of Appropriateness required. Residential properties adjacent to non-residential zones must have 8-foot walls along the shared property line.

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.

Phoenix requires building permits for pools, spas, and hot tubs. Arizona has strict pool barrier requirements under ARS §36-1681. Inspections required.

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 enforces Arizona's Residential Swimming Pool Safety Act (ARS 36-1681) with strict pool barrier requirements. All residential pools require a minimum 5-foot barrier measured from the exterior side. Gates must be self-closing and self-latching with latches at least 4.5 feet above ground. No openings may allow a 4-inch sphere to pass through. Doors from dwellings to pool areas must be self-closing and self-latching.

Phoenix allows up to 2 ADUs per property (one attached, one detached) under Arizona HB 2720 (2024, effective January 2025). A third detached unit is permitted on lots of 1+ acre if one is designated affordable. Each ADU cannot exceed 75% of the main house floor area. On lots up to 10,000 sq ft, ADUs are capped at 1,000 sq ft; larger lots allow up to 3,000 sq ft or 10% of net lot area. Setbacks cannot exceed 5 feet. No additional parking required.

Garage conversions in Phoenix require building permits and must meet residential building code standards for habitable space. Converted garages may qualify as ADUs under HB 2720. The conversion must include proper insulation, egress windows, electrical, ventilation, and plumbing (if applicable). No additional replacement parking is required under state ADU law.

Phoenix Zoning Ordinance Section 706 regulates accessory structures including sheds. Accessory buildings must comply with setback requirements for the zoning district. In residential districts, accessory structures are typically allowed in rear yards with minimum setbacks. Building permits are required for structures over a certain size threshold. Sheds must not be used as dwelling units.

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 gas fire pits year-round. Wood-burning fire pits and chimeneas restricted on MCAQD no-burn days. Clean dry wood only when burning is permitted. Cooking fires have separate allowances.

Maricopa County Air Quality Department (MCAQD) regulates all outdoor burning in Phoenix. No-burn days prohibit wood burning in fireplaces, fire pits, and chimeneas. Cooking fires allowed on no-burn days with restrictions. Yard waste burning prohibited.

Phoenix may protect native desert trees (palo verde, ironwood, saguaro). Street trees are city property. Proper pruning preserves shade in extreme heat.

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 is in the Phoenix Active Management Area with strict water conservation requirements from ADWR. The city provides landscape watering guidelines recommending irrigation before 8 AM or after 6 PM to minimize evaporation. Section 507 of the zoning ordinance requires native/desert-adapted plants for new landscaping. High-water-use species are prohibited in new development. Phoenix water rates include conservation pricing tiers.