Cost of accessory dwelling unit — Tempe, AZ

Looking for cost of accessory dwelling unit in Tempe, AZ? Call AccessoryDwellingUnit Pros 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 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

The total investment for an ADU depends on several moving parts, including your property’s site conditions, the complexity of your site plan, and the high-end finishes you select. Whether you are building a detached cottage or converting a garage, costs vary based on utility connections and local labor rates. 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?

The cost of an ADU in Arizona, including Tempe, varies significantly based on size, design complexity, and site preparation needs. Factors like soil type and foundation requirements in the desert environment can influence the price. Get a personalized quote from local pros for an accurate estimate. They'll factor in all specifics.

What are the rules for ADUs in California?

Is ADU allowed in Maryland?

This service is for Arizona. Maryland has its own specific regulations for Accessory Dwelling Units. If you're looking to build an ADU in Maryland, you'll need to find a service that specializes in that state's building codes and zoning laws. We focus on providing local expert connections in Tempe.

What are the rules for ADU in California?

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: University District, The Lakes, Shady Lawn, Warner Ranch, Downtown Tempe — and every surrounding area.