Accessory dwelling unit companies

Looking for accessory dwelling unit companies in Modesto, CA? Call AccessoryDwellingUnit Services 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 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

These companies provide comprehensive support for homeowners, often pairing design experts with construction crews to handle the entire project under one roof. They are helpful when you want to avoid hiring separate architects and builders. You should look into these companies when you want a streamlined experience and a single point of accountability for your backyard project from start to finish.

Frequently asked in Modesto

What are the disadvantages of ADUs in Modesto?

Potential downsides can include the initial construction costs and the time required for city approvals. You might also consider how an ADU affects your existing yard space or increases utility usage. However, the benefits of increased property value and rental income are often significant. We can help you weigh these factors.

How much does an ADU cost in California?

What are the rules for ADUs in California?

California has state laws that generally streamline ADU development, but Modesto may have specific local regulations regarding setbacks, height, and lot coverage. These rules help ensure ADUs integrate well with existing neighborhoods. Understanding these city-specific guidelines is crucial for a successful project.

Is an ADU allowed in Modesto?

Yes, ADUs are generally permitted in Modesto, in line with state efforts to increase housing availability. Local zoning and specific property characteristics will influence feasibility. We can help you assess your Modesto location's suitability for an ADU project.

While there have been grant programs in California to incentivize ADU development, these can change and may have specific eligibility requirements. It's important to research current programs to see if you qualify. We can point you in the right direction for information on available funding opportunities.

Can I build an ADU on my Modesto property?

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

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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, Ceres, Ripon, Keyes, Empire — and every surrounding area.