Chicago has no quick "after the fact" form that we can confirm. What the City does say: work resumes only after the required permit is obtained and a stop-work penalty is paid, the permit fee is tripled in most cases, and you may have to correct or remove the work. For porches, the City says legalizing something built without a permit does not qualify for Express and needs a plan-based permit. Start by checking the record, then ask the Department of Buildings.
Need a permit for work already done in Chicago? Here is the path the City describes. There are three ways owners end up here. They did the work themselves years ago. A previous owner did it. Or a contractor said "no permit needed" and was wrong. Whichever it is, the question is the same: how do you get a permit for work already done in Chicago? This article gives you the path the City describes and flags where the answer depends on your job. For the broader picture, see the Chicago building permits guide.
First, what the City says happens
The City's page on starting work without a required permit lays out the sequence. A City employee issues a stop work order and posts it. Work resumes only after the required permit is obtained and the stop-work penalty, listed by the City as $1,000 or more, is paid. In most cases the permit fee is tripled. The City may start an enforcement case or a lawsuit, and the owner may have to correct or remove the work at their own expense (City of Chicago).
That text describes what happens when the City finds the work. If you come forward first, we have not found a City page that sets out a different, softer track. Ask the Department of Buildings what applies. Do not assume a discount or an amnesty exists.
Step 1: find out what is on the record
Before you spend money, learn what the City already knows. The Department of Buildings' records search covers permit, inspection and violation records by address (City of Chicago). Look up:
- Whether any permit was ever issued for the work.
- Whether a permit was issued and expired or never closed. See what happens when a permit expires.
- Whether there is an open violation or stop work order.
One caution if you are buying. The City's own data notice says the violation dataset is historical, does not necessarily reflect current condition, and should not be relied on for real estate transactions. It points lenders and title companies to the title commitment for enforcement actions in court or at the hearings department (City of Chicago). The records search is a starting point, not a clean bill of health.
Step 2: identify exactly what was built
"Unpermitted work" covers everything from a swapped window to a converted basement. The route depends on what you have. Write down:
- What was built, rebuilt, removed or changed.
- Where it is, and how big.
- Whether it touches structure, egress, electrical, plumbing or gas.
- What it was before, if you know.
Photograph it from every side, and photograph what you can see of the framing, connections and materials before anyone closes anything up.
Even work that never needed a permit has to meet code. The City says work done under a permit exemption must still comply with all construction codes (City of Chicago). So "it did not need a permit" is not a reason to skip a safety check.
Step 3: expect plan-based review for bigger or structural work
For many jobs, the express route will not fit. The clearest City statement is for porches: the Express Permit Program does not allow legalizing or rebuilding something built without a permit, and those jobs need a plan-based permit (City of Chicago). The City's porch page also says anything previously unpermitted needs plan-based review (City of Chicago).
The City does not say this for every work type, so ask the Department of Buildings which program your job goes in. But it is a good working assumption for structural, porch and addition work.
Plan-based means drawings. The City says any plan-based permit requires plans by an Illinois-licensed architect or engineer (City of Chicago), and Standard Plan Review requires an architect, with zoning approval (City of Chicago). The application must be started by an Illinois-licensed architect or structural engineer, or a City-licensed expediter (City of Chicago). We explain that track in when your permit needs drawings.
The drawings for existing work show what was built, which is different from design drawings for new work. Tell the architect up front that the work is already in place.
Step 4: what inspectors may need to see
We cannot tell you a City inspection procedure for retroactive work because we have not found one published. Expect inspectors to want to confirm the work is safe and code compliant. That may mean access to framing, connections, footings, guards and electrical or plumbing that is now behind finishes. Ask the Department of Buildings, early, what it will need to see, so you know whether walls or floors may have to be opened.
If the work fails to meet code, the fix comes before the permit closes. The City's own language says the owner may have to correct or remove it at their own expense (City of Chicago).
Common finds on older Chicago two-flats and three-flats: a back porch rebuilt bigger than the original, a basement finished into a unit, a rear stair swapped, a bearing wall opened for a new kitchen, and a garage built or converted without a permit. The owner often did not know. A buyer's inspection, a refinance, a neighbor's 311 call or an insurance claim brings it up. A pattern, not a specific job.
Step 5: choose your people
The right team is usually:
- An Illinois-licensed architect or structural engineer to document existing conditions and prepare plans.
- A licensed general contractor (or the correct licensed trade) to fix whatever needs fixing. The City requires a license for most building work; see Chicago GC license requirements.
- A permit expediter or the architect to handle the application.
- An attorney, if there is already a court case, a lien, or a purchase contract involved. Legal decisions are theirs, not ours.
Do not hire the same unlicensed crew that built it.
What to ask the Department of Buildings
- Which permit program does this work go under?
- Is there any record of a permit for this work?
- Will the permit fee be tripled for work already done?
- What do inspectors need to see, and will anything need to be opened?
- Is there an open violation or stop work order I need to address first?
Unpermitted work does not age out. It can surface at a sale or refinance, trigger a stop work order if someone reports it, and cost more to fix the longer it sits. For repeated unpermitted work or ignored stop work orders, the City can suspend a person's ability to submit new permit applications (City of Chicago). Confirm current rules with the Department of Buildings.
Work already done and not sure where it stands? Our expediting team pulls the record, helps you scope what was built and coordinates the architect, the repairs and the filing.
Common questions
Usually the route is to obtain the required permit for the existing work. We have not found a quick after-the-fact form, so ask the Department of Buildings which program applies. For porches, the City says legalizing something built without a permit needs a plan-based permit, not Express.
The City says that after a stop work order, work resumes once the required permit is obtained and the stop-work penalty is paid, and the permit fee is tripled in most cases. Whether it applies if you come forward first is a question for the Department of Buildings.
Often, for structural or larger work. Plan-based permits require plans by an Illinois-licensed architect or engineer, and the City says unpermitted porch work needs plan-based review. Smaller work may differ, so check with the Department of Buildings.
It can. Unpermitted work stays with the building. Check the City's records search before you buy, use the title commitment for enforcement actions, and talk to an attorney about the contract and any liability.
You can, but it can resurface at a sale, a refinance, an insurance claim or a neighbor's 311 call, and it may be unsafe. Get it assessed. Repeated unpermitted work can also lead to the City suspending permit application privileges.
Sources
- City of Chicago: Guide to Building Permits: What Happens If I Start Work Without a Required Permit?
- City of Chicago, Department of Buildings: Permit Professional Lookup: Help
- City of Chicago, Department of Buildings: Search Building Department Records
- City of Chicago Data Portal: Building Violations dataset
- City of Chicago: Express Permit Program: Porch, Deck, Balcony, or Fire Escape Repair
- City of Chicago, Department of Buildings: Porch and Deck Safety
- City of Chicago: Guide to Building Permits: When Is a Licensed Architect or Engineer Required?
- City of Chicago, Department of Buildings: Standard Plan Review Permit Program
- City of Chicago: Guide to Building Permits: What Types of Work Do Not Require a Building Permit?
Facts last checked: October 7, 2026.
This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.