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

Avondale's Zoning Ordinance caps front-yard walls and fences at three feet six inches, with approval up to six feet if line-of-sight surveillance is kept. Rear and side yards allow up to six feet, rising to eight feet for single-family lots next to an arterial road.

Avondale requires a building permit for any wall taller than seven feet under Section 28-297(c)(5) of its Zoning Ordinance. Walls and fences at or below the standard zoning heights generally do not trigger a building permit but must still meet design, material, and sight-visibility standards.

Avondale's Zoning Ordinance regulates wall height, design, and placement, but it does not set cost-sharing rules for fences on a shared property line. Arizona has no comprehensive partition-fence statute, so a boundary fence is generally treated as a shared responsibility under common law unless an HOA or written agreement says otherwise.

Avondale does not set a separate retaining-wall height in its fence article, so retaining walls are reviewed under the City's adopted Building Code. Following Arizona's International Residential Code practice, retaining walls over four feet (measured from the bottom of the footing) or any wall supporting a surcharge require a permit and engineered design.

Avondale's code specifies the materials walls and fences must use: solid, durable masonry such as cast-in-place concrete, precast concrete block, or natural stone, at least six inches thick, with at least two different materials or treatments per wall. Galvanized chain-link and barbed wire are not allowed except at temporary construction sites.

Pool safety in Avondale is governed by Arizona's A.R.S. 36-1681 enclosure law and the city's adopted 2024 International Swimming Pool and Spa Code. Requirements include a five-foot barrier, self-latching gates 54 inches high, and protections for doors and windows facing the pool.

Avondale requires a building permit before constructing a swimming pool or spa. The city's Building Services Division reviews site and construction plans against the adopted 2024 International Swimming Pool and Spa Code and local amendments (effective January 1, 2026).

Avondale's zoning ordinance (Sec. 28-136(a)) requires pools to be enclosed per state law. Arizona's A.R.S. 36-1681 mandates a barrier at least five feet high on the exterior side, with self-closing, self-latching gates and no openings a four-inch sphere can pass through.

Avondale's zoning rules apply to 'all permanent or non-permanent pools' more than 18 inches deep, so above-ground pools are regulated. Setbacks under Sec. 28-136 apply, and the state enclosure law (A.R.S. 36-1681) plus the adopted 2024 ISPSC govern barriers.

Hot tubs and spas more than 18 inches deep fall under Avondale's pool rules (Sec. 28-136) and the state enclosure law A.R.S. 36-1681, which applies to contained bodies of water 18 inches or deeper. Avondale has also adopted the 2024 International Swimming Pool and Spa Code.

Avondale's Zoning Ordinance Section 28-33 permits at least one attached and one detached ADU on any single-family lot. ADUs are capped at 75 percent of the main home's floor area or 1,000 square feet, whichever is less, with five-foot side and rear setbacks, no extra parking, and no owner-occupancy requirement.

Avondale's Zoning Ordinance has no section dedicated to garage conversions, but Section 28-164 requires single-family dwellings to provide an enclosed garage with two interior spaces. Converting a garage to living space removes required covered parking, so the spaces generally must be replaced to stay code-compliant.

Avondale's Zoning Ordinance treats sheds as detached accessory buildings. Under Section 28-133, they cannot be placed in a front yard, may not exceed 15 feet in height when accessory to a residence, and count toward maximum lot coverage. Sheds in the rear half of a lot may encroach into required rear and side setbacks.

Avondale's Zoning Ordinance does not set carport-specific residential setbacks, so carports follow the general accessory building and parking rules. In single-family districts they generally must meet required yards, while Section 28-133(d) lets covered parking canopies encroach into side and rear setbacks only in non-residential districts.

Avondale has no tiny-home-specific ordinance. A tiny house on a permanent foundation is regulated like any dwelling or accessory dwelling unit under Section 28-33, but Avondale's ADU rules expressly prohibit using a mobile home, RV, or other movable habitable space as an ADU, which rules out most tiny homes on wheels.

Avondale has no standalone fire-pit ordinance; backyard fire pits are governed by the 2018 International Fire Code adopted in City Code Sec. 10-40 and by Maricopa County air-quality rules. On a county No-Burn Day, wood-burning fire pits and chimineas may not be used at all.

Burning vegetation or trash is not permitted within Avondale city limits, per city guidance. Open burning is governed by Maricopa County Air Quality Department Rule 314, which prohibits all outdoor fires except those it specifically allows and bans burning on declared No-Burn Days.

Avondale City Code section 14-170(j) limits dead and dry palm fronds, and section 14-170(m) bars landscaping that contributes to visual blight, including substantially dead or damaged vegetation. Required landscaping must also be kept healthy under zoning code section 28-298.

Avondale has no general permit requirement for removing a tree from an ordinary private yard. However, zoning code section 28-298 requires prior approval from the zoning administrator before permanently removing or modifying landscaping that was installed under an approved landscape plan, and dead trees must be replaced.

Avondale does not assign fixed watering days. Instead, City Code section 24-34 prohibits the waste of water, including runoff, overflow, broken sprinkler heads, and emitters spraying more than ten percent of their flow off-target onto pavement, public property or the right-of-way.