Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Des Moines, IA? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Des Moines 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

When estimating the cost to build, consider the difference between a prefab unit and custom construction, as well as site preparation requirements like clearing trees or grading land. Labor and material prices also play a significant role. We provide an exact pricing confirmed free on the call.

Frequently asked in Des Moines

What are the disadvantages of ADUs in Des Moines?

Potential disadvantages of adding an ADU in Des Moines include the initial construction cost and the time it takes to obtain necessary permits. You'll also want to consider how it might affect your yard space and privacy. Discussing these with a local specialist can help you weigh the pros and cons for your specific property.

How much does an ADU cost in Iowa?

The cost to build an accessory dwelling unit in Iowa, including Des Moines, varies widely based on size, design complexity, and material selections. Site preparation, foundation requirements, and utility connections are significant factors. A personalized quote from a local professional will provide the most accurate pricing for your project.

What are the rules for ADUs in Iowa?

Iowa has state guidelines for ADUs, and Des Moines will have its own specific local ordinances. These typically address zoning, setbacks, lot coverage, and parking requirements. A quick call to us can help you connect with someone who can explain these rules clearly for your property.

Is an ADU allowed in Des Moines?

What factors influence the cost of an ADU in Des Moines?

Also serving nearby: Cedar Rapids · Omaha · Davenport · Lincoln · Independence

All cities in Iowa →

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

Service area details

210,381residents

2,386per sq mile

8ZIP codes served

Serving all of Des Moines — population 210,381; about 2,386 residents per square mile across 88.2 sq mi. ZIP codes covered include 50301, 50302, 50303, 50304, 50305, 50306, 50307, 50308.

Neighborhoods served in Des Moines: Drake Neighborhood, Sherman Hill, Waterbury, Ashworth, South of Grand — and every surrounding area.