Do I need a permit for addition or structural alteration in Joliet?
Yes. In Illinois, addition or structural alteration generally requires a permit, and Joliet is no exception.
Additions and structural alterations require a permit in essentially all Illinois jurisdictions. Illinois has no statewide residential building code for this work, so the permit threshold is set by your municipality or county. The statewide codes that took effect on 1 January 2025 apply to commercial, public and state-funded buildings. Many local codes require zoning review for lot coverage and setbacks, and properties in a mapped flood zone face additional elevation requirements. Joliet requires a permit for additions, expansions, and structural alterations under the adopted 2015 International Building and Residential Codes, filed on the New Home/Remodel permit application. Most of these permits also require Planning and Zoning review. Structural modifications and complex mechanical, electrical, or plumbing systems may require construction documents prepared and sealed by an Illinois-licensed design professional. The permit fee is $65 for up to $7,000 of work plus an additional $10 per $1,000 of project cost above $7,000. Submit forms to permitapplication@joliet.gov or the City Hall drop box, since there is no online portal.
Documents you may need
- Plat of survey / site plan showing setbacksrequired
- Construction drawings (floor plan, elevations)required
- Structural details or engineered plansLikely required
- Contractor license and insurance informationSometimes required
- New Home/Remodel permit applicationrequired
- Accurate plat of survey and construction drawingsrequired
- Construction documents prepared and sealed by an Illinois-licensed design professional (for structural modifications or complex systems)Likely required
Possible inspections
- Footing/foundation inspection
- Framing inspection
- Rough electrical/plumbing/mechanical inspection
- Final inspection
- Foundation and framing inspections
- Rough electrical, plumbing, and mechanical inspections where applicable
- Final building inspection
Frequently asked questions
- Do I need a permit for addition or structural alteration in Joliet?
- Yes. In Illinois, addition or structural alteration generally requires a permit, and Joliet is no exception. Additions and structural alterations require a permit in essentially all Illinois jurisdictions. Illinois has no statewide residential building code for this work, so the permit threshold is set by your municipality or county. The statewide codes that took effect on 1 January 2025 apply to commercial, public and state-funded buildings. Many local codes require zoning review for lot coverage and setbacks, and properties in a mapped flood zone face additional elevation requirements. Joliet requires a permit for additions, expansions, and structural alterations under the adopted 2015 International Building and Residential Codes, filed on the New Home/Remodel permit application. Most of these permits also require Planning and Zoning review. Structural modifications and complex mechanical, electrical, or plumbing systems may require construction documents prepared and sealed by an Illinois-licensed design professional. The permit fee is $65 for up to $7,000 of work plus an additional $10 per $1,000 of project cost above $7,000. Submit forms to permitapplication@joliet.gov or the City Hall drop box, since there is no online portal.
- Who issues the permit in Joliet?
- The local building department for Joliet handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.