Modular accessory dwelling unit — Santa Maria, CA

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 modular unit is built in a factory and then transported to your property to be finished on a foundation. You should consider this if you want a faster construction timeline with less disruption to your daily life. It is an efficient way to add high-quality space to your lot.

Frequently asked in Santa Maria

Also serving nearby: San Buenaventura Ventura · Bakersfield · Oxnard · Thousand Oaks · Simi Valley

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

Service area details

Serving all of Santa Maria — population 109,987; about 4,821 residents per square mile across 22.8 sq mi. ZIP codes covered include 93454, 93455, 93456, 93457, 93458.

Neighborhoods served in Santa Maria: Old Town Santa Maria, The Bluffs, River View, Crestwood — and every surrounding area.