Cost of accessory dwelling unit — Tempe, AZ | AccessoryDwellingUnit Services

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

Building an ADU involves several variables that shift the total investment. Your site conditions, the type of foundation, and the quality of finishes you choose will dictate whether you land on the lower or higher end of the spectrum. Because every lot is unique, we provide a breakdown of your specific project requirements to ensure full transparency. Exact pricing confirmed free on the call.

Frequently asked in Tempe

What are the disadvantages of ADUs in Tempe?

Disadvantages of ADUs in Tempe can include the initial construction investment and potential impacts on your existing yard space. You'll also want to consider how an ADU might affect your property taxes. A local specialist can help you weigh these pros and cons.

How much does an ADU cost in Arizona?

ADU costs in Arizona, including Tempe, vary greatly depending on size, materials, and site specifics. Factors like foundation work, utility upgrades, and design complexity significantly influence the price. A personalized quote is the most accurate way to estimate.

What are the rules for ADUs in Tempe?

Tempe has specific zoning ordinances and building codes that govern the creation of ADUs. These rules typically address lot size, setbacks, parking, and design compatibility with the surrounding neighborhood. Understanding these is essential for your project.

Is an ADU allowed in Tempe?

Yes, accessory dwelling units are allowed in Tempe, with specific requirements outlined in the city's zoning and building codes. These regulations are in place to ensure ADUs are safely and appropriately integrated into the community. We can help you understand them.

What are the rules for ADU in Arizona?

Arizona has state laws that promote ADUs, but local cities like Tempe establish their own detailed regulations. These often involve limits on size, owner occupancy, and utility connections. A professional can clarify these specifics for your Tempe home.

Can I build an ADU on my property in Tempe?

Your ability to build an ADU in Tempe hinges on meeting the city's zoning requirements, including lot size and distance from existing structures. A site assessment by a local expert is the best way to confirm your property's suitability.

Also serving nearby: Chandler · Gilbert · Mesa · Phoenix · Glendale

All cities in Arizona →

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

Service area details

189,834residents

4,748per sq mile

8ZIP codes served

Serving all of Tempe — population 189,834; about 4,748 residents per square mile across 40.0 sq mi. ZIP codes covered include 85280, 85281, 85282, 85283, 85284, 85285, 85287, 85288.

Neighborhoods served in Tempe: ASU Area, Downtown Tempe, Cheery Lynn, Papago Park Area, Shady Grove — and every surrounding area.