Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Scottsdale, AZ? Call AccessoryDwellingUnit Experts 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

Thinking about an accessory dwelling unit (ADU) in Scottsdale? These additions are becoming increasingly popular for their flexibility and potential to boost property value. Given Scottsdale's desirable location and diverse neighborhoods, an ADU makes a lot of sense. You might be curious about the disadvantages of ADUs, such as the initial investment or the process of obtaining permits, but these are typically manageable. The cost to build an accessory dwelling unit here depends on factors like size, materials, and any unique site characteristics on your lot. Arizona's specific ADU laws and Scottsdale's ordinances are key to a smooth project. We're here to guide you through it. Let us help you discover the possibilities for your home. Don't wait to explore this exciting opportunity.

What affects the price

Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.

About this service

Building an ADU involves costs for permits, site prep, foundation, framing, plumbing, and electrical work. Prices fluctuate based on whether you choose a custom design or a pre-planned layout, as well as the complexity of connecting to existing city utilities. Exact pricing confirmed free on the call.

Frequently asked in Scottsdale

What are the disadvantages of ADUs?

Some potential disadvantages of ADUs include the upfront financial investment and the impact on your existing yard space. You might also consider the added utility costs and potential for increased traffic or noise. However, thoughtful design and planning can address most of these concerns effectively. Discussing these with a professional is a good idea.

How much does an ADU cost in Arizona?

The cost to build an accessory dwelling unit in Arizona varies based on several factors. The size of the ADU, the chosen finishes, and the complexity of the site preparation are significant cost drivers. Permitting fees and any necessary utility upgrades also contribute to the overall expense. A personalized quote will give you the most accurate figure.

What are the rules for ADUs in Arizona?

ADU regulations in Arizona are often set at the state level, but local municipalities like Scottsdale have their own specific ordinances. These rules typically cover aspects like maximum size, setback requirements, and parking. It's essential to understand both state and local guidelines for your project.

Is an ADU allowed in Scottsdale?

Yes, ADUs are permitted in Scottsdale, provided they comply with the city's zoning ordinances and building codes. These regulations often address issues such as lot size, the ADU's relationship to the primary dwelling, and occupancy rules. Verifying these requirements for your specific property is crucial.

What is the cost to build an accessory dwelling unit in Scottsdale?

Can I get advice on ADU planning in Scottsdale?

Absolutely, getting advice on ADU planning in Scottsdale is a wise first step. You can explore design possibilities, understand the local zoning laws, and get a preliminary idea of project costs. This initial consultation is key to assessing your project's feasibility.

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, DC Ranch, McCormick Ranch — and every surrounding area.