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
A prefab ADU is built in a factory and then transported to your property for final assembly. You might choose this if you want a faster construction timeline and less mess in your backyard compared to a traditional build. Because the structure is made off-site, it often helps with site control and weather-related delays. Exact pricing confirmed free on the call.
Frequently asked in Gilbert
What are the requirements for a prefabricated ADU in Gilbert?
What's the best accessory dwelling unit design for my Gilbert property?
What are the accessory dwelling unit construction costs in Gilbert?
What are the benefits of ADU housing in Gilbert?
What are some affordable accessory dwelling unit options in Gilbert?
What is a backyard accessory dwelling unit in Gilbert?
What is the cost of an accessory dwelling unit in Gilbert?
Also serving nearby: Chandler · Mesa · Tempe · Phoenix · Scottsdale
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
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, The Groves, Windsor Creek, Gilbert Commons, Finley Farms, Alta Mesa — and every surrounding area.
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