Best adu — Tempe, AZ | AccessoryDwellingUnit Services

Looking for best adu 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

Defining the best unit for your property depends on your specific goals, such as maximizing rental yield or creating a versatile multi-generational living space. A great build features high-quality insulation, smart storage solutions, and an aesthetic that complements your main house. We emphasize durable construction and efficient design to ensure your unit remains a valuable asset for your property over the long term. Let us help you plan the right layout. Exact pricing confirmed free on the call.

Frequently asked in Tempe

What are the disadvantages of ADUs in Tempe?

A potential disadvantage of an ADU in Tempe could be the reduction in your existing backyard space. You'll also need to consider potential increases in utility bills and how it might affect your property taxes. Navigating the permitting process efficiently is important to avoid delays.

How much does an ADU cost in Tempe?

The cost of an ADU in Tempe varies based on its size, design, and the materials used. Site preparation, utility hookups, and local permit fees are also significant cost factors. To get an accurate figure for your specific property, a detailed quote is essential.

What are the rules for ADUs in Arizona?

Arizona has state laws that encourage ADUs, and Tempe has adopted its own specific ordinances. These typically address lot coverage, setbacks, the number of bedrooms allowed, and parking requirements. It's crucial to consult the city's planning and zoning department for the most current regulations.

Is an ADU allowed in Tempe?

Yes, ADUs are allowed in Tempe, provided they meet the city's established zoning and building code requirements. These regulations are in place to ensure ADUs integrate well into existing neighborhoods. The professionals can help you determine exactly what's permissible on your lot.

Arizona may have different grant or financing options available for ADU projects, so it's worth inquiring about any local or state assistance when you get your estimate.

What are the rules for ADU in Tempe?

Rules for ADUs in Tempe often include guidelines on maximum square footage, minimum lot sizes, and whether the ADU can be attached or detached. Specific parking requirements and design standards might also apply. Understanding these details is vital for a compliant project.

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, Shady Park, The Lakes, Clark Park, Benedictine — and every surrounding area.