Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Des Moines, IA? Call AccessoryDwellingUnit Pros 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 is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Determining the cost requires looking at site preparation, foundation work, and the level of interior finishing you choose. Costs change based on whether you opt for a pre-designed layout or custom architecture. You should research these costs when you are ready to evaluate the financial return of your property upgrade. Exact pricing confirmed free on the call.

Frequently asked in Des Moines

What are the disadvantages of ADUs?

Potential drawbacks include the initial construction costs and the ongoing management of the unit. Des Moines' specific zoning and building codes will also need to be addressed. However, the benefits of increased rental income and property value are substantial.

How much does an ADU cost in Iowa?

The cost to build an ADU in Iowa, including Des Moines, varies depending on size, materials, and site preparation needed. Detached units can have different cost structures than attached ones. We can provide a detailed estimate for your specific project.

What are the rules for ADUs in Iowa?

While Iowa has some statewide guidelines, Des Moines has its own local ordinances regarding ADUs. These typically cover aspects like lot size, setback requirements, and utility access. The pros will guide you through these local rules.

Is an ADU allowed in Maryland?

That grant program is specific to California and does not apply to Iowa. For Des Moines residents, the focus will be on local financing and the return on investment an ADU can provide. We can help you explore your options.

What are the rules for ADU in California?

California's ADU laws are distinct from those in Iowa. For Des Moines, the pertinent regulations are the city's local ordinances and any relevant state of Iowa building codes. The specialists you'll speak with are experts in these Des Moines requirements.

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: Downtown Des Moines, West Des Moines (adjacent), Beaverdale, Sheridan Gardens, South of Grand — and every surrounding area.