Looking for accessory dwelling unit construction cost in Scottsdale, AZ? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Scottsdale 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

The cost to build an ADU depends on factors like your foundation type, utility connection distances, interior finish choices, and whether you are doing a detached build or a garage conversion. We provide an exact pricing confirmed free on the call.

Frequently asked in Scottsdale

What are the disadvantages of ADUs in Scottsdale?

Potential drawbacks include the initial investment and the added responsibility of managing another dwelling. You may also see an increase in utility costs. It’s wise to weigh these against the benefits of added space and potential income.

How much does an ADU cost in Arizona?

ADU construction costs in Arizona can vary significantly based on square footage, materials chosen, and site preparation needs. The complexity of utility connections and the specific Scottsdale zoning requirements will also impact the overall price. A personalized quote is essential for accuracy.

What are the rules for ADUs in Scottsdale?

Scottsdale has specific regulations for ADUs, including rules on lot size, maximum square footage, and how they can be occupied. These ordinances are designed to maintain neighborhood character. Understanding these guidelines is the first step in planning your ADU.

Is an ADU allowed in Phoenix's surrounding areas like Scottsdale?

Yes, Scottsdale actively permits ADUs, provided they meet all local zoning and building codes. The city encourages ADUs as a way to add diverse housing options. A quick call can help confirm suitability for your specific property.

What affects the cost of ADUs in Scottsdale?

The size of the ADU, the type of foundation, and the chosen interior and exterior finishes are major cost drivers. Site accessibility for construction crews and any required utility upgrades also contribute to the overall expense. Discussing your vision will help clarify costs.

What is the process for building an ADU in Scottsdale?

Also serving nearby: Phoenix · Glendale · Tempe · Mesa · Peoria

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

Service area details

244,394residents

1,328per sq mile

8ZIP codes served

Serving all of Scottsdale — population 244,394; about 1,328 residents per square mile across 184.0 sq mi. ZIP codes covered include 85250, 85251, 85252, 85254, 85255, 85256, 85257, 85258.

Neighborhoods served in Scottsdale: Old Town Scottsdale, Kierland, Gainey Ranch, McCormick Ranch, DC Ranch — and every surrounding area.