Attached ADU in Illinois

ADUs (accessory dwelling units) are secondary homes on existing lots. Brothers General Construction builds detached, attached, garage conversion & junior ADUs across Illinois. Chicago ADU costs range $115K–$150K, with strong rental income potential.

We make sure you have clarity in the process, confidence in the execution, and full communication all along the way.

Enclosure bridges the gap between design and construction.

For over three decades, Keen Construction has been rooted in family values and exceptional craftsmanship. Founded by Darren Trybalski, whose father and grandfather were both builders, this deep-rooted connection to construction shaped our commitment to quality and attention to detail from the very beginning.

ADU America builds custom tiny homes & ADUs—studio, 1-bed, 2-bed, garage conversions & more. 25+ years experience, turnkey process, on-site construction, 6–12 month timeline, 1-year warranty & flexible financing options.

Hudson Pro Builders offers ADU construction in Chicago, Cook County, DuPage County & Lake County. Services include garage conversions, basement ADUs, in-law suites & backyard cottages, with full design, permitting & zoning support.

Maya Construction Group is a Chicago-based design-build contractor specializing in home additions and remodeling. Licensed and insured, they handle permits, zoning, and inspections while offering owner-supervised project management for kitchens, bathrooms, and basement finishing.

Chicago legalized ADUs in 2020 across five pilot zones. BLDG Projects ranks among the top ADU contractors in Chicago, specializing in coach house, basement, garage, and attic conversions to help homeowners add rental income or living space.

Chicago's Assembly Squad Remodeling LLC specializes in attic conversions & ADUs. Services include bedroom suites, rental units ($1,500–$2,500/mo), home offices & more. Pricing starts at $50/sq ft. Permits & compliance managed.

Mark Home Builders & Additions is a full-service home contractor proudly serving Elgin and the surrounding communities. They specialize in custom home builds, home additions, and renovations that combine quality craftsmanship with practical design.