Cost to build accessory dwelling unit — Scottsdale, AZ
Last updated: September 24, 2026
What affects the price
Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.
About this service
Determining the cost requires looking at site preparation, foundation work, and the level of interior finishing you choose. Costs change based on whether you opt for a pre-designed layout or custom architecture. You should research these costs when you are ready to evaluate the financial return of your property upgrade. Exact pricing confirmed free on the call.
Frequently asked in Scottsdale
What are the common challenges when seeking accessory dwelling unit companies in Scottsdale?
Are modular accessory dwelling units a viable option for Scottsdale properties?
What are the main considerations for accessory dwelling unit financing in Scottsdale?
How do I find a reliable ADU company in Scottsdale?
What should I look for in an accessory dwelling unit contractor in Scottsdale?
What are the typical challenges of building a backyard accessory dwelling unit in Scottsdale?
Is a prefab ADU a good choice for Scottsdale homeowners?
Also serving nearby: Phoenix · Glendale · Tempe · Mesa · Peoria
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
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, McCormick Ranch, Kierland, Gainey Ranch, South Scottsdale, North Scottsdale — and every surrounding area.
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