It depends on what you touch. DOB says routine maintenance like painting or power washing needs no permit, and neither does replacing non-structural parts such as deck boards, treads or pickets if you have not received a violation. A permit is always required to repair or replace structural elements: columns, beams, foundations, stringers and floor joists, with plans by an Illinois-licensed architect or structural engineer. Express Permit handles repair-type porch work. New, enlarged, enclosed or previously unpermitted porches need a plan-based permit.
Most porch work on a Chicago two-flat falls into one of two buckets: cosmetic and non-structural, or structural. The first often needs no permit. The second always does. Here is how the Department of Buildings draws that line, and which permit track the work goes through. Rules and fees change, so confirm current details with DOB before you start.
What porch work does not need a permit in Chicago?
The Department of Buildings' porch safety page lists what you can do without a permit (DOB Porch and Deck Safety):
- Routine maintenance, such as power washing or painting.
- Replacing non-structural elements like deck boards, stair treads and railing pickets, if you have not received a violation.
- Repairing or replacing a residential porch less than 6 feet off the ground with no more than 50 square feet of landing.
Two catches sit inside that list. First, the "no violation" condition matters. If a notice is already on file, even a non-structural repair goes through the permit process. Second, DOB's general rule for repairs says the exemption ends if the work cuts away part of an exterior wall, removes or cuts a structural beam, column or load-bearing support, or removes or changes a required exit (City of Chicago). On a rear porch that is also the exit from the second or third floor, that last item comes up faster than owners expect.
If the building is a designated Chicago Landmark, exterior work still needs a permit (City of Chicago).
What porch work always needs a permit?
A permit is always required to repair or replace structural elements: columns, beams, foundations, stringers and floor joists. The plans must come from an Illinois-licensed architect or structural engineer (DOB Porch and Deck Safety). This is the rule owners miss most often. A rotted post looks like a small fix. To the City it is a structural repair.
For the code behind those parts, see what Chicago code actually requires for porches. For when drawings are needed, see do you need drawings to rebuild a Chicago porch.
Which Chicago permit track does a porch go through?
Porch repair is a listed worktype in the Express Permit Program, under "Porch, Deck, Balcony, or Fire Escape Repair" (City of Chicago). Express is built for repairs. The City's Express page says it allows (Express porch page):
- Repair of existing structures, including replacing up to 50% of an existing single-story porch of conventional materials.
- In-kind replacement.
- With drawings by an architect or structural engineer: replacing wood with steel, replacing railings to meet current guard height and opening size, and reinforcing members to meet current structural minimums.
What Express does not allow, per the same page:
- New structures.
- Structures that are larger or smaller, or in a different location or configuration.
- Legalizing or rebuilding something built without a permit.
- Replacing noncombustible material with combustible material, such as steel with wood.
- Enclosed porches.
Those jobs need a plan-based permit. DOB sums up the split this way: structural repair or replacement always needs a permit, Express is repair oriented, and anything bigger, different, enclosed or previously unpermitted needs plan-based review (City of Chicago). For the plan-based side, see the Standard Plan Review explainer.
Enclosing a porch has its own rules. We cover them in enclosing a Chicago back porch.
Who can pull a porch permit?
A contractor usually applies for the permit. An owner can also act as their own contractor if the building is the primary residence, no more than 3 stories and no more than 6 units. That means taking on responsibility for worker safety, scheduling inspections and code compliance (DOB Porch and Deck Safety). For Express permits in other worktypes, the City asks for Form 401 and a government ID showing you live at the property, so expect the same for a porch and confirm with DOB.
Whether the person doing the work needs a City license is a separate question from whether a permit is needed. The City's general contractor licensing rule covers most construction and repair work, including work that is exempt from a permit, with exceptions for some owners and for licensed trades inside their license (City of Chicago). Check with the Department of Buildings, and see can you rebuild your own porch in Chicago.
The common mistake is not skipping a permit on a paint job. It is treating a "post swap" or a "stringer fix" as a handyman repair. On older Chicago porches those are structural. They are exactly the work DOB says always needs a permit and plans.
What happens after the work is done?
If you do not have open porch violations, you request the permit inspection through DOB's online permit inspection appointment form. If your case is in Circuit Court, a court inspector handles the follow-up. If you are in Administrative Hearings, bring the permit and before and after photos to the hearing (City of Chicago). We walk through it in how to get a porch inspected after repair.
If scaffolding, a dumpster or material storage will sit on the sidewalk or alley, that is the public way, and it needs a separate permit from the Chicago Department of Transportation (City of Chicago). Rear porches that face an alley often touch it.
Structural porch work done without a permit can get a stop work order. Under the City's unpermitted work process, work resumes only after the required permit is obtained and the stop-work penalty is paid, the permit fee is usually tripled, and you may have to correct or remove the work at your own expense. Confirm current amounts with the Department of Buildings. Work that was built without a permit also falls outside Express and needs a plan-based permit, which means more cost and more steps.
What to ask your contractor
- Is this repair structural? Which parts, exactly?
- Who is pulling the permit, and what is the permit number?
- Do we need drawings from an architect or structural engineer?
- Will anything go on the sidewalk or alley?
- Who requests the inspection when the work is done?
If the answers are vague, that is your answer. When you want a straight read on what your porch needs, our porch crew will look at it. The wider picture is in the Chicago porch guide. For the full process, see how a Chicago porch rebuild works.
Common questions
According to DOB, not if you have not received a violation: replacing non-structural elements such as deck boards, stair treads and railing pickets does not need a permit. If a violation is on file, the repair goes through the permit process. Confirm with the Department of Buildings.
Yes. DOB says a permit is always required to repair or replace structural elements such as columns, beams, foundations, stringers and floor joists, with plans by an Illinois-licensed architect or structural engineer.
Often, yes. Express covers repair of existing porches, including replacing up to 50% of a single-story porch of conventional materials. It does not cover new, resized, enclosed or previously unpermitted porches, which need a plan-based permit.
No. DOB lists routine maintenance such as power washing and painting as work that does not need a permit. Landmark buildings are an exception for exterior work, so check if yours is designated.
Possibly. An owner may act as their own contractor if the building is the primary residence, no more than 3 stories and no more than 6 units. You take on responsibility for safety, inspections and code compliance. Confirm the requirements with DOB.
Sources
- City of Chicago, Department of Buildings: Porch and Deck Safety
- City of Chicago: Express Permit Program: Porch, Deck, Balcony, or Fire Escape Repair
- City of Chicago: Guide to Building Permits: Application Instructions
- City of Chicago: Guide to Building Permits: What Types of Work Do Not Require a Building Permit?
- City of Chicago, Department of Buildings: General Contractor License
- City of Chicago: Guide to Building Permits: What Happens If I Start Work Without a Required 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.