ADUs are allowed in AvondaleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Avondale, AZ
Is your property eligible for an ADU?
# of Properties
25,826
Owner-occupied
71%
Zoning districts
30
Avg Home Value
$374,044
Median Lot Size
0.15 acres
Avg Income
$99,701
Residential Types:
25,826 housing units
Other
99%
Zoning Districts:
30,343 parcels · 30 districts
PAD
82%(24,847)
R1-6
10%(3,093)
R-3
3%(773)
C-2
1%(337)
Other
4%(1,293)
ADU Rules
What can you build in Avondale, AZ?
Avondale, AZ follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Internal/attached ADU (In-Home Apartment): maximum size of 1,000 sq ft on a single-family lot.
- –Internal/attached ADU (In-Home Apartment): maximum size of 75% of the existing single-family dwelling’s interior habitable area (falls back to gross building area if habitable area is unavailable).
Detached ADU Size Limits
- –Maximum size of 1,000 sq ft for a detached ADU on a single-family lot
- –Maximum size of 75% of the existing single-family dwelling's interior habitable (gross floor) area for a detached ADU
Max Units
- –Under 1 acre: 1 attached ADU + 1 detached ADU per lot.
- –1 acre or more: 1 attached ADU + 1 detached ADU per lot; or 1 attached ADU + 2 detached ADUs per lot if at least one is a restricted-affordable dwelling unit.
- –0 ADUs on lots with duplex, townhome, or other multifamily development.
Owner Occupancy
- –Owner occupancy not required for ADUs.
Parking
- –0 spaces; shared driveway with primary dwelling; parking governed by single-family standards (e.g., 2-car garage); visitor spaces only if on-street/driveway parking is not provided.
Rental Restrictions
- –ADUs with a CO issued on/after 9/14/2024 shall not be used as vacation or short-term rentals unless the owner resides on the same property; long-term rentals permitted.
- –Restricted-affordable ADUs: rent may not exceed AZ Housing limits; shall not be rented to any entity; must be leased to qualified occupants as their principal residence (≥6 months/year); owner must meet annual reporting requirements.
ADU State Law
What can you build in Arizona?
- –ADUs must be allowed as a permitted use wherever single-family dwellings are allowed.
- –Must allow at least 2 ADUs per lot (1 attached + 1 detached). A third detached ADU must be allowed if the lot is ≥ 1 acre and one ADU is restricted-affordable (≤ 80% Area Median Income).
- –ADU rules cannot be more restrictive than single-family rules in the same zoning area for height, setbacks, lot size, lot coverage, and building frontage; and side/rear setbacks cannot exceed 5 feet.
- –The city cannot require additional parking (or fees in lieu of parking).
- –The city cannot prohibit separately leased long-term rentals (≥ 90 days or month-to-month) for either the primary home or the ADU; local short-term rental rules may still apply.
- –The city cannot require the ADU to match exterior design, roof pitch, or finishing materials of the primary home.
- –The city cannot require public street improvements as a condition of allowing an ADU, except to repair or reconstruct a street disturbed by ADU construction.
- –The city cannot require a restrictive covenant as a condition of approving an ADU.
- –ADUs cannot be built over a public utility easement without written utility consent; building, fire, and health codes still apply, but the city cannot require commercial code or sprinklers solely because it is an ADU.
- –Private restrictions may still apply (HOAs, deed restrictions, and other private covenants between parties).
- –Backstop rule: If the municipality failed to adopt the required ADU regulations by January 1, 2025, ADUs are allowed on residential lots in that municipality without limits.
- –In municipalities with population ≤ 75,000, in unincorporated county areas, and on the statute's exempt lands (tribal; defined military vicinity; defined airport vicinity with >65 dB), there is no state ADU override. ADUs depend on local rules.
- –Private deed restrictions and HOA covenants may still limit ADUs, and the statute does not eliminate those private covenants (it mainly limits what a municipality can require or condition).
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Arizona municipalities
Rules change at the town line. Check the municipality your property is actually in.
Maricopa County