ADU Locator

1 Best ADU Builders in Chicago, Evanston, Oak Park, Illinois

Verified ADU contractors and builders in Chicago, Evanston, Oak Park, IL

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Coach House Builders, LLC

We specialize in ADU Construction Management and offer Garden Unit Legalization and ADU code compliance services. We navigate design, permitting, unique construction challenges, and use experienced construction contractor professionals to produce beautiful, functional buildings.

+1 262-421-8464
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Frequently Asked Questions — ADU Builders in Chicago, Evanston, Oak Park

How much does it cost to hire an ADU builder in Chicago, Evanston, Oak Park?

ADU construction costs in Chicago, Evanston, Oak Park, Illinois vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Chicago, Evanston, Oak Park to get accurate quotes for your specific project.

How long does it take to build an ADU in Chicago, Evanston, Oak Park?

In Chicago, Evanston, Oak Park, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Illinois local regulations. Prefab and modular ADUs often have faster timelines than site-built units.

Do I need a permit to build an ADU in Chicago, Evanston, Oak Park?

Yes, a building permit is required for ADU construction in Chicago, Evanston, Oak Park, Illinois. Your ADU builder will typically handle the permit application as part of their service. Illinois has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.

What types of ADUs can be built in Chicago, Evanston, Oak Park?

Common ADU types in Chicago, Evanston, Oak Park include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Chicago, Evanston, Oak Park ADU builder can advise on what's allowed on your specific parcel.