Looking for accessory dwelling unit services in Chicago, IL? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Chicago 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 services cover the end-to-end process of adding a secondary home to your property. This includes initial zoning checks, architectural design, permit filing, and final construction. You need these services when you want to create a separate living space for family, guests, or as a rental unit, but don’t want to manage the complex legal and structural requirements on your own.

Frequently asked in Chicago

What are the disadvantages of ADUs in Chicago?

Potential disadvantages of ADUs in Chicago can include navigating the city's zoning laws, which have specific requirements for size and placement. You may also encounter challenges with existing infrastructure or lot limitations in denser areas. Consulting with local pros can clarify these points for your specific property.

How much does an ADU cost in Chicago?

What are the rules for ADUs in Chicago?

Is ADU allowed in Maryland?

Accessory Dwelling Units are permitted in Maryland, but local regulations differ significantly by county and municipality. Some areas have more restrictive rules than others. If you're considering an ADU in Maryland, it's crucial to research the specific local ordinances. Pros in Chicago can detail those rules.

What are the rules for ADU in California?

California has state laws that encourage ADUs, but local jurisdictions maintain their own specific requirements. These often cover size limits, setbacks, and parking. Professionals in California can clarify these rules for your specific city, ensuring compliance.

Also serving nearby: Naperville · Aurora · Joliet · Elgin · Waukegan

All cities in Illinois →

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

Service area details

2,664,452residents

11,699per sq mile

8ZIP codes served

Serving all of Chicago — population 2,664,452; about 11,699 residents per square mile across 227.7 sq mi. ZIP codes covered include 60601, 60602, 60603, 60604, 60605, 60606, 60607, 60608.

Neighborhoods served in Chicago: Lincoln Park, Wicker Park, Hyde Park, Lakeview, Pilsen, Old Town — and every surrounding area.