Here is the Chicago building code violations list owners of two-flats should know, with one honest caveat first: we did not find a City ranking of the "most common" violations, so we will not hand you a made-up top ten. What we can do is lay out the conditions the City's own code and inspection process target, and mark which ones we see most on older Chicago buildings.
How do violations get written in the first place?
Mostly through complaints. Inspections of occupied buildings are largely complaint driven: a Department of Buildings supervisor reviews every 311 complaint at the start of each business day to decide which need immediate inspection. The inspector verifies the complaint and also checks smoke and CO detectors and means of egress, including interior and exterior stairs and porches, and writes violations for what they see.
The City's 311 intake covers porch safety, construction without a permit, general safety, and vacant or abandoned buildings. So the violations that actually get written follow what neighbors, tenants and passersby notice and report. Anything visible from the street or the alley tends to land on the list.
What does the exterior maintenance standard cover?
Most of the list below traces back to one rule. The City's code requires that the exterior of a structure be maintained in good repair, structurally sound and sanitary. It then lists unsafe conditions, three of which describe a typical Chicago two-flat:
- masonry joints that are not weather resistant or water tight
- veneer, cornices, belt courses, corbels, trim and facings that are not properly anchored
- exterior stairs, decks, porches and balconies, including guards and handrails, that are not structurally sound or properly anchored
That is a statement of the standard as of the 2019 text of the code. Confirm the current language with the Department of Buildings, because section numbers and wording can change.
The list: what gets cited on older two-flats
1. Rear porches, stairs, guards and handrails
The standard for exterior stairways, decks, porches and balconies is that they be structurally sound, in good repair, properly anchored and able to support the loads placed on them, and that handrails and guards be firmly fastened. Rotted posts, loose or missing guards, spongy treads and failing connections to the building are the usual findings. Porches carry extra weight in Chicago because of the history: after a deadly 2003 collapse the City expanded porch inspections, and porch violations were reported to fall from 6,670 in 2006 to 2,127 in 2019. The City still takes them seriously.
2. Masonry: open joints, loose brick and failing parapets
Crumbling mortar and open joints are cited because water gets in. Loose brick, bulging walls, cracked lintels and unanchored cornices or parapet coping are cited because they can fall. If the sidewalk below is public way, the stakes rise. For how to read your own brick, see our two-flat exterior inspection checklist.
3. Smoke and carbon monoxide detectors, and exits
Inspectors check smoke and CO detectors and means of egress on the visit. Missing or dead detectors, blocked exits and bad exterior stairs are among the easiest items for an inspector to confirm in one walkthrough. They are also among the cheapest to fix, which makes them the most avoidable violation on this list.
4. Work done without a permit
If the City finds work underway without a required permit, a stop work order can be posted. The City's page says work resumes only after the permit is obtained and the stop-work penalty is paid, the permit fee is tripled in most cases, and the owner may have to correct or remove the work at their own expense. Not every repair needs a permit and many do. Check with the Department of Buildings before work starts.
5. Roofs, gutters and water damage
Water that is not controlled leads to every other item on this list. Failing flashing, clogged gutters and open roof edges show up as stained walls, rotted porch framing and spalled brick. Inspectors cite the condition they see, so the water damage is often what puts the building on the list.
What makes a violation more likely to be cited?
Our read, based on how cases begin:
- Visibility. Front brick, a sagging porch seen from the alley, anything over a sidewalk.
- A tenant or neighbor who is frustrated. Complaints drive the process.
- A prior violation that was never closed. Open cases keep the building on the City's radar. You can look up violations by address on the City's records search and its Data Portal dataset.
- Deferred maintenance. Small items that sat for years become structural ones.
On two-flats built before the modern codes, owners are often surprised that a "small" condition becomes a violation: a porch post sitting in rot, a few loose bricks over a gangway, a rear stair with a guard that moves. These are usually discovered by a neighbor, a tenant or a contractor working next door, not by a surprise sweep. A routine look at the exterior twice a year catches most of them first.
How do I get ahead of the list?
A walk around your own building takes an hour and costs nothing. Stand in the alley and look at the back porch posts, the guards and the stair connection. Press on the guard rail. Look up at the cornice and the parapet. Scrape a few mortar joints with a key. Test every smoke and carbon monoxide detector. Check that each exit opens and is clear. Write down what you find, with dates and photos. Anything you cannot judge yourself is worth a second set of eyes before a neighbor makes the call for you. DIY-safe items, like detector batteries and clearing exits, you can do today. Structural and masonry repairs belong with a licensed contractor.
What do I do if I am already cited?
Read the notice, identify which room the case is in, and plan the repair around the hearing date. Our step by step repair guide covers the order. If you are still learning what the code requires of existing buildings, read how Chicago's code applies to existing buildings, and for the paperwork side see what a violation notice really says.
Our building code violations team repairs cited porches, masonry and exits, pulls the permits and documents the work. For the whole process, see the Chicago building violations guide. This article explains the standard and is not legal advice. Confirm current requirements with the Department of Buildings.
Common questions
We did not find a City ranking, so we cannot name one. The conditions the City's code and inspectors target most often on older buildings are porches and stairs, masonry, detectors and exits, and work done without a permit.
Mostly through complaints. A Department of Buildings supervisor reviews 311 complaints each business day, and the inspector verifies the complaint and also checks detectors and exits, including exterior stairs and porches.
Yes. The Department of Buildings has a records search by address for permits, inspections and violations, and the Chicago Data Portal publishes a Building Violations dataset. Use them as a guide and confirm current status with the City.
It can be. The City's maintenance standard requires that porches, stairs, handrails and guards be structurally sound, in good repair and properly anchored. A guard that moves under normal use does not meet that standard.
Sources
- City of Chicago, Department of Buildings and Department of Law: Building Code Violation Enforcement Process (PDF)
- City of Chicago: Code Modernization Ordinance, including Title 14X Minimum Requirements for Existing Buildings (PDF)
- City of Chicago: Guide to Building Permits: What Happens If I Start Work Without a Required Permit?
- City of Chicago, Department of Buildings: Department of Buildings home page
- CBS News Chicago: 20 years since the Lincoln Park porch collapse (June 29, 2023)
- City of Chicago, Department of Buildings: Search Building Department Records
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.