Adu services — Phoenix, AZ | AccessoryDwellingUnit Services

Looking for adu services in Phoenix, AZ? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Phoenix and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

About this service

ADU services manage the technical side of building a backyard cottage or garage conversion. From verifying local property setbacks to plumbing and electrical connections, these professionals handle the logistics required to make a structure legal and habitable. You should reach out for these services when you have an idea for an extra living space but need a professional to ensure the project meets all safety codes and city regulations.

Frequently asked in Phoenix

What are the disadvantages of ADUs in Phoenix?

The main disadvantages can be the initial construction costs and the time required for permitting in Phoenix. You should also consider potential increases in property taxes and insurance. Thorough planning is essential for a smooth process.

How much does an ADU cost in Phoenix?

ADU costs in Phoenix can vary significantly based on the size of the unit, the materials chosen, and any site-specific needs such as utility connections or foundation work. Factors like lot accessibility also play a role. A detailed quote is necessary.

What are the rules for ADUs in Arizona?

Arizona has state laws that encourage ADU development, generally making them permissible in most residential zones. Phoenix also has specific ordinances regarding setbacks, height, and lot coverage that must be followed. Local experts are familiar with these.

Can I build an ADU in my Phoenix backyard?

Yes, most single-family zoned properties in Phoenix can accommodate an ADU, provided it meets the city's size and setback requirements. The pros will assess your property to ensure compliance with all local ordinances.

What permits are needed for an ADU in Phoenix?

You will need to obtain building permits from the City of Phoenix Planning and Development Department. This involves submitting detailed plans that comply with all city building codes and zoning regulations. Experienced contractors will guide you.

Are there grants for ADUs in Phoenix?

While specific state-level ADU grants like California's aren't as common in Arizona, there may be local programs or financing options available. It's worth asking the service provider about any current incentives when you get your quote.

Also serving nearby: Glendale · Scottsdale · Tempe · Peoria · Surprise

All cities in Arizona →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

1,650,070residents

3,183per sq mile

8ZIP codes served

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, Ahwatukee, Downtown Phoenix, Scottsdale (nearby, often considered) — and every surrounding area.