Adu cost — Tempe, AZ | AccessoryDwellingUnit Services

Looking for adu cost 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

The final cost of your ADU is influenced by factors like utility trenching, site excavation, and the complexity of the architectural design. Larger units or those requiring extensive foundation work will naturally cost more than simple interior conversions or small studios. We help you prioritize your budget items to get the most value out of your square footage. Exact pricing confirmed free on the call.

Frequently asked in Tempe

What are the disadvantages of ADUs in Tempe?

How much does an ADU cost in Arizona?

ADU costs in Arizona, including Tempe, vary widely. Factors like square footage, foundation type, and the chosen finishes significantly impact the price. Site preparation, including utility connections and grading, also plays a role. A personalized quote is the most reliable way to get an accurate estimate.

What are the rules for ADUs in Arizona?

Is an ADU allowed in my Tempe neighborhood?

Generally, ADUs are permitted in most residential zones throughout Tempe, aligning with state mandates. Specific lot sizes and existing structures can influence feasibility. It’s always best to confirm the exact regulations for your property address. A quick call can help verify this.

Can I build an ADU in Tempe?

In most instances, yes, you can build an ADU in Tempe, provided your property meets the city's zoning requirements for lot size and setbacks. Tempe is actively promoting ADUs to increase housing options. A simple call can help assess your property's suitability and guide you on the next steps.

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: Maple-Ash Historic District, University District, Broadmor, Shady Lane, Dixie — and every surrounding area.