Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
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The amount you spend depends on the size of the unit, whether you are building from scratch or converting an existing structure, and the quality of your finish materials. Foundations, utility connections, and local labor rates also play a significant role. We provide exact pricing confirmed free on the call.
Frequently asked in Phoenix
What are the disadvantages of ADUs in Phoenix?
Potential disadvantages for ADUs in Phoenix can include ensuring adequate cooling and insulation for the desert climate, which can impact energy costs. The permitting process, while streamlined, still requires careful plan submission and adherence to city codes. Parking requirements can also be a factor depending on the specific zoning and location within Phoenix. Getting all the details upfront is important.
How much does an ADU cost in Phoenix?
The cost of an ADU in Phoenix is influenced by its size, design, and the materials used. Factors like site preparation, foundation work, and utility connections are significant cost drivers. The specific type of ADU—whether it's a detached structure or an attached addition—also plays a role. The chosen contractor and their pricing will also affect the final expense. A precise quote is the best way to determine cost.
What are the rules for ADUs in Phoenix?
Phoenix has specific rules for ADUs, generally allowing them on single-family zoned lots with certain size and setback requirements. The city aims to simplify the process, but it's crucial to adhere to all local building codes and zoning ordinances. Working with professionals familiar with Phoenix's planning and development guidelines is recommended. They can ensure your project meets all criteria.
Is an ADU allowed in Phoenix?
Yes, ADUs are allowed in Phoenix, with regulations designed to facilitate their construction on single-family properties. The city has made efforts to streamline the process for homeowners. While there are specific guidelines regarding size, density, and placement, ADUs are a recognized and encouraged housing option. A consultation will help you confirm your property's eligibility.
Arizona may have its own state or local incentives, but they would be different from California's offering. It's advisable to research any available financial assistance programs within Arizona or specifically for Phoenix residents considering ADU construction. We can help guide your search.
What are the setback requirements for ADUs in Phoenix?
Phoenix has specific setback requirements for accessory dwelling units, which typically depend on whether the ADU is detached or attached to the primary dwelling. Detached ADUs usually need to meet side and rear yard setback requirements similar to accessory structures. Attached ADUs may have different rules. It's essential to consult the city's zoning ordinance or a local expert for the precise measurements applicable to your property.
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, Scottsdale, Paradise Valley, Camelback East, Downtown Phoenix — and every surrounding area.
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