Basement permits and inspections
Basement work that adds walls, plumbing, electrical or a bedroom usually needs a permit. The City and every suburb set their own steps, so confirm yours before the scope is final.
Chicago uses its own codes, and each suburb adopts and enforces its own. That is why a basement answer for one address may not hold for another.
What the City of Chicago publishes
- For permit applications started on or after August 1, 2020, the City says the work must comply with the 2019 Chicago Building Code or the 2019 Chicago Building Rehabilitation Code. The City's list of codes also includes plumbing, electrical, mechanical, energy, fire prevention and fuel gas codes and the Zoning Ordinance.
- The Express Permit Program covers some interior alterations: nonstructural interior work up to 2,000 square feet in a single residential unit, including electrical work, HVAC and plumbing up to five water supply fixture units. The City's own example is that adding a private bathroom counts as four.
- Even in that path, walls and doorways for rooms other than closets may be added or reconfigured only with drawings prepared by an Illinois-licensed architect or structural engineer.
- The City lists work that is not eligible for that Express path: structural work, new or rearranged interior stairs, exterior work such as replacing exterior windows or doors, changing occupancy, converting unheated space into living space, and work in a space that has never been legally occupied, such as the first build-out of a shell.
What that likely means for a basement
This is our reading of the City's list, not a ruling. A basement that has never been legally occupied, or a job that cuts a new exit window, appears to fall outside the Express path and into a plan-based review with drawings. Whether your basement qualifies for any path is decided by the Department of Buildings, not by us. We would rather tell you to plan for a longer review than to promise a quick permit.
Not sure what applies to your house?
Send photos of your basement with an estimate request, or call 847.962.4689. Robert will tell you what he would look at first.
In the suburbs
Each village or city has its own permit office, forms, inspection steps and standards for bedrooms. We have linked the official permit office for each municipality on our area pages.
Read next: Permit offices by municipality
What inspections are for
Inspections happen at points when something is about to be hidden: under-slab plumbing before the concrete is patched, framing and wiring before insulation and drywall, and a final inspection. Work that is hidden before inspection is the work that has to be opened again. Ask which inspections your office requires and who is present for each.
Why it matters beyond the building
Work done without a permit tends to surface later: at a sale, in an insurance claim, when a neighbor complains or when an inspector comes for another reason. A finished basement that cannot show what was permitted can be harder to sell and to insure. Ask who is pulling the permit, and ask to see it.
Questions
Do I need a permit to finish my basement?
Work that adds walls, plumbing, electrical or a bedroom usually does. Your city or village decides what is required for your address.
Who pulls the permit?
It is agreed in the written scope, and the scope names who does it. Ask to see the permit once it is issued.
Can I skip the permit to save money?
We do not recommend it. Unpermitted basement work is the kind that gets found at a sale or after a flood, and it can mean opening finished walls.
Homes where this comes up
Keep reading
Sources checked
Checked November 5, 2026. Codes and programs change. Check the current rule with your city or village before you rely on it.
Tell Robert about your project.
Call, email or send an estimate request with photos. You deal directly with the person running your job. Robert replies within 2 business days.