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Steel & concrete modular homes in Illinois
Modular homes are built to state and local building codes and set on a permanent foundation. Here is what applies in Illinois.
Illinois program
- Administering agency
- Illinois Department of Public Health (IDPH)
- Program / authority
- Illinois Manufactured Housing and Mobile Home Safety Act; Modular Dwellings and Mobile Structures Code, 77 Ill. Adm. Code 880
- Code basis
- 2018 International Residential Code for 1-2 family units; 2017 NEC; 2018 Illinois Energy Conservation Code (amended eff. Mar 21, 2023)
- Inspection & seal
- Each unit must bear an Illinois seal (or a seal from a reciprocity state) and a code compliance certificate.
- Good to know
- Units cannot be located in Illinois unless approved under the Act; reciprocity agreements with other states are recognized.
- Official source
- https://idph.illinois.gov/envhealth/pdf/ModularDwelling_MobileStructuresCode880.pdf
Summarised from public sources; rules change. Confirm with Illinois’s agency and your local building department before ordering.
Your project in Illinois
Step 1
Confirm zoning & permits
Local jurisdiction sets lot, setback and design rules. See Permits & Zoning.
Step 2
Plans reviewed to state code
We stamp plans for the code that applies in Illinois.
Step 3
Factory build & inspection
Third-party or state inspection happens in the factory, then final on site.
Step 4
Set, connect, certify
Modules crane in, joints are torqued and inspected, and local sign-off issues the CO.