ADUs are allowed in WillcoxTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Willcox, AZ
Is your property eligible for an ADU?
# of Properties
1,233
Owner-occupied
60%
Zoning districts
24
Avg Home Value
$86,197
Median Lot Size
0.20 acres
Avg Income
$46,462
Residential Types:
1,233 housing units
Single Family
31%
Other
69%
Zoning Districts:
4,322 parcels · 24 districts
R-1
51%(2,204)
R-2
11%(494)
R-3-A
7%(293)
R-3-M
6%(256)
Other
25%(1,075)
ADU Rules
What can you build in Willcox, AZ?
Willcox, 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 size of 1,000 sq ft
- –Maximum size of 50% of the primary dwelling’s gross floor area
Detached ADU Size Limits
- –Maximum detached ADU size is the lesser of 1,000 sq ft or 50% of the primary dwelling’s gross floor area.
Max Units
- –1 ADU per lot or parcel
Owner Occupancy
- –The property owner must reside in the primary dwelling or the ADU.
Parking
- –Off-street parking required on the same lot; no stated min/max; in residential zones, no more than 30% of the required front/street-yard may be used for driveways/parking; forward-travel access not required for parking tied to one- and two-family dwellings.
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.
Cochise County