Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in Modesto, CA? Call AccessoryDwellingUnit Solutions for a contact a provider — no obligation. Licensed adu builders serve Modesto 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 involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

The cost of building an ADU depends on your choice of materials, the square footage, and whether you are doing a garage conversion or a new detached build. Site access and utility upgrades also play a big role in the final bill. Exact pricing confirmed free on the call.

Frequently asked in Modesto

What are the disadvantages of ADUs in Modesto?

How much does an ADU cost in California?

What are the rules for ADUs in California?

California has statewide laws encouraging ADUs, but Modesto has specific local ordinances that must be followed for permitting and construction. These can include requirements for setbacks, height limits, and parking. Understanding these is vital for a smooth process. Call for advice specific to Modesto.

Is an ADU allowed in Maryland?

This information pertains to Modesto, California. Maryland has its own distinct regulations for accessory dwelling units. If you are interested in ADUs in Maryland, you will need to consult local resources specific to that state. For California projects, we can assist.

Grant programs and their availability vary significantly by state and locality. It's important to research current funding opportunities in the Modesto area. We can help you find experts who know these details.

How do I start an ADU project in Modesto?

Also serving nearby: Manteca · Tracy · Stockton · Merced · Antioch

All cities in California →

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

Service area details

218,915residents

5,049per sq mile

8ZIP codes served

Serving all of Modesto — population 218,915; about 5,049 residents per square mile across 43.4 sq mi. ZIP codes covered include 95350, 95351, 95352, 95353, 95354, 95355, 95356, 95357.

Neighborhoods served in Modesto: Salida (adjacent), Ripon (adjacent), Oakdale (adjacent), Ceres, Riverbank — and every surrounding area.