Phoenix casita guide: backyard homes are legal here — your lot decides the details

Phoenix allows detached backyard casitas on most single-family lots under its accessory dwelling unit (ADU) rules, updated alongside Arizona’s HB 2720. What varies — size, placement, and utility requirements — depends on your zoning and your property. That’s why we screen the lot before we price it.

The Phoenix posture, in one line: detached casitas are an allowed, permitted use on most Phoenix single-family lots — subject to the city’s size, setback, and lot standards. Meter and utility requirements are confirmed property-by-property during your feasibility check; we don’t publish a guessed rule for a city this big.

What to know about building a casita in Phoenix

State law baseline: Arizona’s HB 2720 (2024) requires cities over 75,000 people to allow ADUs on single-family lots and limits extra local restrictions. Phoenix updated its ordinance in that framework.
Permits run through the City of Phoenix Planning & Development Department. A building permit is always required for a detached casita; our licensed building partner prepares and submits the package.
Size is usually tied to your lot and main home: Phoenix standards cap casita size relative to the property, and setbacks and lot coverage apply. Historic districts and special overlays can add design review — your check flags them.
Utilities are property-specific: water, sewer, and electric connection requirements — including whether meters are shared or separate on your lot — are confirmed during the feasibility check and priced after the site review, in writing.
HOAs are separate from the city: where an HOA exists, its CC&Rs may add restrictions beyond the city’s rules.
Renting: long-term rental is the standard use case; short-term rental rules and registration requirements are set by the city and state and can change — confirm before building an income plan on nightly rentals.

Phoenix price picture

Model	Size	Published starting price
The Compact	380 sq ft studio	From $65,000 where shared-meter scope applies; otherwise priced after your check
The Haven	600 sq ft 1-bed	From $149,000
The Legacy	800–850 sq ft 2-bed	From $219,000

Starting prices for defined scopes; your final price is set in writing after a site review. For comparison, Phoenix turnkey ADUs commonly run $300–$375 per square foot all-in across the market — our fixed models exist to land well under that, with the scope printed.

Phoenix lot? Screen it for free

Send your address. We check zoning, size limits, setbacks, and your utility picture — and answer within 1 business day.

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Other city guides: Chandler (shared meters) · Glendale (separate meters) · Mesa