Looking for best accessory dwelling unit in Modesto, CA? Call AccessoryDwellingUnit Direct 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 variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.

About this service

The best ADU is one that fits your property’s layout and your long-term needs, whether you are hosting family or generating rental income. Quality build standards and energy efficiency are key to ensuring your investment holds value over time. We prioritize durable materials and functional floor plans that make sense for your specific lot. By focusing on your priorities, we create a unit that works for your life. Exact pricing confirmed free on the call.

Frequently asked in Modesto

How much does an ADU cost in Modesto?

What are the rules for ADUs in California?

Is an ADU allowed in Modesto?

While there have been various grant programs for ADUs in California, specific details and availability can change. It's best to ask the pros directly about any current financial incentives or programs they're aware of during your consultation. They can offer practical advice.

Can I build an ADU on my property in Modesto?

What are the disadvantages of ADUs in California?

In California, potential disadvantages of ADUs can include upfront construction costs and the time it takes to get permits. You'll also want to consider how it might impact your existing yard space. However, these are all things the pros can help you plan for. They'll walk you through the entire process.

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: Downtown Modesto, Salida, West Modesto, East Modesto, Riverbank — and every surrounding area.