ADUs are allowed in Unincorporated MaricopaTypes:DetachedInternal

Types:DetachedInternal

Accessory Dwelling Unit (ADU) Rules for Unincorporated Maricopa, AZ

Is your property eligible for an ADU?

# of Properties

184,211

Owner-occupied

75%

Zoning districts

Avg Home Value

$372,448

Median Lot Size

0.24 acres

Avg Income

$94,430

Residential Types:

184,211 housing units

Other

100%

Zoning Districts:

208,774 parcels · 99 districts

RU-43

33%(68,890)

R1-6

28%(57,878)

R-3

8%(16,369)

R1-7

7%(15,011)

Other

24%(50,626)

ADU Rules

What can you build in Unincorporated Maricopa, AZ?

Unincorporated Maricopa, 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

–Maximum ADU size equals the principal dwelling’s size; on lots under 1 acre it is further limited to the lesser of 75% of the primary dwelling or 1,000 sq ft.

Detached ADU Size Limits

–Detached ADU may not exceed the size of the principal dwelling; on lots under 1 acre it is further capped to the lesser of 75% of the principal dwelling or 1,000 sq ft.

Max Units

–Single-family lots: 2 ADUs per lot (1 attached + 1 detached).
–Single-family lots ≥1 acre: at least 1 additional detached ADU, if at least one ADU is deed-restricted affordable to households up to 80% AMI.

Owner Occupancy

–Owner must reside on-site for short-term rentals with ADU.

Parking

–No ADU-specific parking requirements; ADUs must share a single access point to the street with the primary residence.

Rental Restrictions

–Short-term rentals: max one ADU (STR) per parcel; STRs ≤30 days, rented as a whole unit to a single party; owner must reside on the property for STRs unless the ADU received final approval on or before September 13, 2024; STRs may not host commercial events or operate commercial enterprises and may not be rented to registered sex offenders; if adding a second detached ADU on lots ≥1 acre, at least one ADU must be deed-restricted affordable and rented to households up to 80% AMI.

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

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