CMI Construction
Belleville, IL
4.8(39)
ADU ConstructionBathroom RemodelingCustom Home Building
CMI Construction. Construction company
Looking for the best custom ADU builders in Belleville, Illinois? Our directory features 3 vetted custom adu builders serving the Belleville area. Whether you're planning a new ADU construction, garage conversion, or backyard cottage, find the right builder for your project.
CMI Construction. Construction company
Compass Design Build LLC.. Custom home builder
Superior Contracting. Home builder. 226 Centreville Ave, Belleville, IL 62220, United States
Belleville is one of the top markets for accessory dwelling units in Illinois. With growing demand for affordable housing, ADU construction in Belleville offers homeowners an excellent opportunity to add living space, generate rental income, or house family members. Our curated list of custom adu builders in Belleville helps you find experienced professionals who understand local building codes, zoning regulations, and permit requirements.
ADU construction costs in Belleville typically range from $150,000 to $350,000 depending on size, design, and finishes. Garage conversions are generally less expensive ($80,000–$150,000), while custom-built detached ADUs can cost more. Get free quotes from our listed custom adu builders to compare prices.
Yes, ADU construction in Belleville requires building permits. Illinois has specific ADU regulations, and local zoning laws may have additional requirements. Our listed builders can help you navigate the permitting process.
ADU construction timelines in Belleville typically range from 4–12 months, depending on the project type. Prefab ADUs can be installed in 2–4 months, while custom builds may take 8–12 months including design and permitting.