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

Mesa doesn't require a building permit for fences up to six feet high on property zoned for single-residence use under Title 4, Chapter 1 of the city code. The exemption drops away on Desert Uplands Development Standards land, inside a Historic Preservation Overlay District, on a designated historic landmark site, or where the fence sits on a public easement.

Mesa caps front-yard fences at 3.5 feet (4.5 feet if the top 1.5 feet is see-through) in residential and agricultural districts, 6 feet in side/rear yards there, and shifts to an 8-foot side/rear limit in all other zoning districts, under Title 11, Chapter 30.

Building or installing a residential swimming pool in Mesa requires a building permit under § 4-1-4(A) before any digging or construction starts, unless the pool is a prefabricated above-ground unit 18 inches or shallower holding 5,000 gallons or less. Pools are also regulated by the 2024 International Swimming Pool and Spa Code, adopted as the Mesa Swimming Pool and Spa Code.

Mesa requires all residential pools and spas to have barriers at least 5 feet high per the adopted building code and ARS 36-1681. Gates must be self-closing and self-latching with no openings larger than 4 inches.

Mesa lets homeowners convert an existing detached garage, carport, or accessory structure into an ADU without adding new setbacks, and doesn't require replacing the covered parking a converted garage or carport used to provide. Section 11-31-3(D)(2) and (G)(2) of the Zoning Ordinance govern the conversion.

Mesa allows one attached ADU and one detached ADU per lot in any Agricultural, Residential, Commercial and Mixed Use, or Downtown district where a Single Residence is permitted. There's no minimum lot size, but an ADU's interior habitable area can't exceed 75% of the primary residence's footprint or 1,000 square feet, whichever is smaller, under Mesa City Code § 11-31-3.

Mesa exempts small detached accessory structures, tool sheds, storage sheds, playhouses, from the building permit requirement when they serve a single-family, duplex, or similar residential occupancy and stay at or under 200 square feet, under Title 4, Chapter 1. The exemption doesn't apply on Desert Uplands land, in Historic Preservation Overlay Districts, or on landmark sites.

Mesa's Fireplace Restrictions ordinance, which forces new wood-burning fireplaces and woodstoves to use EPA-certified inserts, expressly carves out fire pits and barbecue grills as "not regulated and are not prohibited by this section." No separate Mesa ordinance sets fire-pit setbacks or hours.

Mesa's landscaping ordinance sets minimum tree sizes for new development, a quarter of required trees must be 36-inch box or larger and half 24-inch box, with none smaller than 15-gallon, plus species-diversity caps and mandatory replacement of any tree that dies.

Filling a decorative lake or watering a large turf facility from Mesa's water system requires a City Lake Permit under Mesa City Code § 8-10-7(A), on top of any Arizona Department of Water Resources approval. The permit sets source-water, evaporation-control, and depth conditions and can be revoked if they lapse.

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