Looking for cost of accessory dwelling unit 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

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 Gilbert

What are the disadvantages of ADUs?

Some potential downsides include upfront construction costs and potential impacts on your existing yard space. You'll also want to consider how an ADU might affect your property taxes. However, these are often outweighed by the benefits of increased property value and rental income. Let us help you weigh the pros and cons for your specific Gilbert property.

How much does an ADU cost in Arizona?

What are the rules for ADUs in Arizona?

What are the disadvantages of ADUs?

Adding an ADU can sometimes lead to increased utility bills for your property. You might also face challenges with neighbor relations if not properly managed. However, the potential for increased rental income and property value often makes these concerns manageable. We can help you explore solutions.

What are the rules for ADUs in Arizona?

What are the disadvantages of ADUs?

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, Agritopia, Gilbert Commons, Gilbert Heights, The Islands — and every surrounding area.