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.
Also serving nearby: Rialto · Rancho Cucamonga · Jurupa Valley · Ontario · San Bernardino
More on this: HUD ADU resources — ADU policy and financing research.
Serving all of Fontana — population 215,465; about 4,978 residents per square mile across 43.3 sq mi. ZIP codes covered include 92331, 92334, 92335, 92336, 92337.
Neighborhoods served in Fontana: North Fontana, South Fontana, The Colonies, Northgate, Summit View — and every surrounding area.
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