ADUs are allowed in MaranaTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Marana, AZ
Is your property eligible for an ADU?
# of Properties
24,809
Owner-occupied
82%
Zoning districts
33
Avg Home Value
$414,549
Median Lot Size
0.17 acres
Avg Income
$117,037
Residential Types:
24,809 housing units
Single Family
97%
Other
3%
Zoning Districts:
32,717 parcels · 33 districts
SP
71%(23,166)
R-6
12%(4,050)
R-8
4%(1,181)
R-7
3%(929)
Other
10%(3,391)
ADU Rules
What can you build in Marana, AZ?
Marana, 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
- –In mixed-use zones, the maximum size of an internal or attached ADU is the greater of 800 sq ft or 30% of the principal dwelling’s area (garages are not counted as habitable area).
Detached ADU Size Limits
- –Maximum detached ADU size is the greater of 800 sq ft or 30% of the principal dwelling’s floor area (garages excluded from habitable area).
Parking
- –0 spaces required; no ADU max; exceptions: mixed-use zones require parking behind the building; BU medium/high and DN/DT zones require alley/rear-lane access with street screening (42 inches to 6 feet high)
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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
Is your property eligible for an ADU?
ADU rules in other Arizona municipalities
Rules change at the town line. Check the municipality your property is actually in.
Pinal County