What does accessory dwelling unit mean — Phoenix, AZ
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.
About this service
An accessory dwelling unit is a secondary housing unit on a single-family residential lot. It can be attached to your home, like a basement apartment, or detached in your backyard. People ask this when they are starting to explore ways to increase their property's utility or income potential. It is essentially a complete living space with its own kitchen, bathroom, and entrance. Exact pricing confirmed free on the call.
Frequently asked in Phoenix
What are prefab and modular ADUs in Phoenix?
How can I find affordable ADU options in Phoenix?
Who builds accessory dwelling units in Phoenix?
What's the typical cost of building an ADU in Phoenix?
What's involved in ADU construction in Phoenix?
What are the advantages of ADU building in Phoenix?
Can I get an ADU contractor in Phoenix?
Also serving nearby: Glendale · Scottsdale · Tempe · Peoria · Surprise
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Phoenix — population 1,650,070; about 3,183 residents per square mile across 518.3 sq mi. ZIP codes covered include 85001, 85002, 85003, 85004, 85005, 85006, 85007, 85008.
Neighborhoods served in Phoenix: Arcadia, Biltmore, Downtown Phoenix, North Phoenix, South Phoenix, Ahwatukee — and every surrounding area.
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