Looking for accessory dwelling unit cost in Des Moines, IA? Call AccessoryDwellingUnit Direct 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 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

Total costs are influenced by the complexity of your site, the square footage of the unit, and the specific utility upgrades needed to support a new home. Choosing between a prefab unit and a custom build also changes your bottom line. We provide exact pricing confirmed free on the call.

Frequently asked in Des Moines

What are the disadvantages of ADUs?

Potential disadvantages of ADUs include the initial construction expenses and the possibility of reducing your usable backyard space. You may also see an increase in utility costs and property taxes. It's wise to consider these factors before proceeding.

How much does an ADU cost in Des Moines?

The cost of an ADU in Des Moines depends heavily on its size, design, and the materials selected. Site preparation, foundation requirements, and the complexity of the build are significant cost drivers. A free, personalized quote is the best way to get an accurate estimate.

What are the rules for ADUs in Iowa?

Iowa has state-level guidelines for ADUs, but specific regulations are often determined at the local city level. Des Moines has its own zoning ordinances that dictate requirements for accessory dwelling units, including size, placement, and parking. Consulting local experts is key.

Is ADU allowed in Des Moines?

Yes, ADUs are permitted in Des Moines, Iowa, provided they comply with the city's adopted zoning and building codes. Des Moines has regulations in place that allow for the construction of accessory dwelling units within certain parameters.

What factors affect ADU cost 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, Downtown Des Moines, Beaverdale, South of Grand — and every surrounding area.