Looking for accessory dwelling unit 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

These services cover the end-to-end process of adding a secondary home to your property. This includes initial zoning checks, architectural design, permit filing, and final construction. You need these services when you want to create a separate living space for family, guests, or as a rental unit, but don’t want to manage the complex legal and structural requirements on your own.

Frequently asked in Phoenix

What are the disadvantages of ADUs in Phoenix?

Potential disadvantages of ADUs in Phoenix can include navigating specific zoning regulations, such as setback requirements and lot coverage limits. You might also need to consider the impact on your existing yard space or utility connections. Discussing these with local pros can clarify any concerns.

How much does an ADU cost in Phoenix?

What are the rules for ADUs in California?

California has state laws that encourage ADUs, but local jurisdictions maintain their own specific requirements. These often cover size limits, setbacks, and parking. Professionals in California can clarify these rules for your specific city, ensuring compliance.

Is ADU allowed in Maryland?

Accessory Dwelling Units are permitted in Maryland, but regulations vary significantly by county and municipality. Some areas have more restrictive rules than others. If you're considering an ADU in Maryland, it's crucial to research the specific local ordinances. Pros in Phoenix can detail those rules.

This program is not available in Arizona. However, discussing your project with Phoenix-based experts can help you discover any relevant local incentives or financing options.

What are the rules for ADU in California?

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, Scottsdale, Tempe, Glendale, Ahwatukee, Paradise Valley — and every surrounding area.