Looking for accessory dwelling unit construction cost in Gilbert, AZ? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Gilbert 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

Building costs vary based on the size of the unit, the quality of finishes, the complexity of the site foundation, and utility connections. You should consider these expenses when budgeting for a long-term property investment or home expansion. Exact pricing confirmed free on the call.

Frequently asked in Gilbert

What are the disadvantages of ADUs in Gilbert?

Disadvantages can include zoning restrictions, potential impacts on your existing yard space, and the upfront cost of construction. You'll also want to consider how an ADU might affect your property taxes. It's important to weigh these against the benefits for your specific situation in Gilbert.

How much does an ADU cost in Arizona?

What are the rules for ADUs in Gilbert?

Can I add an ADU to my property in Gilbert?

Generally, most single-family zoned lots in Gilbert can accommodate an ADU, provided you meet specific size and setback requirements. The density of your lot and existing structures are also considered. A site assessment by a pro will confirm your property's eligibility.

What is the process for building an ADU in Gilbert?

What affects the cost of an ADU in Gilbert?

Key cost drivers include the ADU's square footage, the quality of finishes chosen, and any necessary site work like grading or utility connections. The complexity of the foundation and roofline also impact the price. Get a personalized quote to see what affects your specific project.

Also serving nearby: Chandler · Mesa · Tempe · Phoenix · Scottsdale

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

Service area details

275,411residents

4,011per sq mile

7ZIP codes served

Serving all of Gilbert — population 275,411; about 4,011 residents per square mile across 68.7 sq mi. ZIP codes covered include 85233, 85234, 85295, 85296, 85297, 85298, 85299.

Neighborhoods served in Gilbert: Power Ranch, Windsor Park, Gilbert Heights, The Islands, Agritopia — and every surrounding area.