The department, and what it actually produces
The Chicago Department of Buildings is the City of Chicago agency that issues building permits, enforces the Chicago Construction Codes, and inspects both construction work and existing buildings. Every record this site discusses is a byproduct of that agency doing those things, which means the record follows the shape of the department's workflow rather than the shape of the building it describes.
That distinction does most of the work on this page. A reader looking at a Chicago property wants a history of the structure. What the department generates is a history of its own transactions with that structure's owners: an application was filed, a fee was taken, an approval was issued, sometimes an inspector attended, sometimes an enforcement case opened and later closed. The building appears in that record only where it intersected an administrative process.
The department is also not the only City body in the chain. Zoning sits with the Department of Planning and Development — the City department responsible for land use, zoning administration and landmarks — and its sign-off is a separate gate from anything the Department of Buildings reviews. Underground work draws in the Chicago Department of Transportation. Landmark buildings and buildings in Landmark Districts draw in landmark review. A permit record is therefore a composite of several departments' decisions, presented as one row.
Why there is more than one route to a permit
Chicago does not run a single permit process. It runs several parallel ones, sorted by the size and complexity of the project, and the choice among them determines who — if anyone — read the drawings before the permit issued. These are the routes: distinct review pathways, each with its own eligibility thresholds and its own standard of scrutiny, all of which end in the same kind of public record.
The Department's own homeowner guide describes four. The Easy Permit Process covers small repair and replacement work that needs no architectural plans at all — window and door replacement, tuckpointing, chimney repair, small sheds and garages, light fixtures, sewer repair. Standard Plan Review covers small to mid-size construction and renovation, which the guide bounds at buildings up to 80 feet, residential properties up to 49 units and commercial properties under 150,000 square feet; City plan reviewers examine the drawings. Self-Certification lets a registered Illinois-licensed architect or structural engineer certify code compliance in place of a City plan review. Developer Services handles large and complex projects — buildings over 80 feet, residential buildings of 50 or more units, foundations 12 feet or deeper — where part of the review may be performed by third-party reviewers rather than by the City.
Those thresholds should be read as the guide states them and no further. The document says its code information is correct as of July 2017, so the numbers above describe the structure the City published rather than a current legal test, and whether each threshold still stands is unverified here.
Source: Guide to Building Permits, City of Chicago Department of Buildings, October 2019.
What the routes have in common, and what they do not
The useful way to hold four routes in mind is to ask what each one removes. Easy Permit removes plan review because there are no plans. Self-Certification removes City plan review but keeps the plans, which a private professional has certified. Developer Services keeps review but allows some of it to be bought from third parties. Standard Plan Review removes nothing — it is the route against which the others are defined.
What none of them removes is zoning. Zoning review asks whether the use and bulk of a project are permitted: how many dwelling units, how tall, how far from the lot lines, how much floor area, how much parking. It survives every route, including self-certification, where the Department's rules expressly retain review by the Zoning Administrator and the Department of Planning and Development alongside stormwater and underground-coordination review. So a self-certified permit does prove a City review occurred — just not a City review of how the building is put together.
Nor does any route establish that the work was inspected. Inspection is a separate event, generating a separate record, governed by a separate part of the department. A permit is an authorization to begin; whether anyone ever came back to look is a question the permit cannot answer.
Where the record thins out: the field
The system's weakest published point is the field — the stage after the paperwork, when an inspector physically attends a site and forms a judgment about what is actually there. Chicago's permitting side is documented in considerable detail and published daily. Its inspection side is not published as a standalone dataset at all, which means a passed inspection generally produces no public record. The system is visible chiefly through its failures: violations are published, clearances largely are not.
How uneven the field stage is was measured directly. The City of Chicago Office of Inspector General audited the Department of Buildings' permit inspections process in 2022 and found that required inspections were completed on 98.9% of permits that require a certificate of occupancy — the document the City issues when a building may lawfully be occupied — against 16.7% of permits that do not require one. That contrast, meaning the gap between two measured rates of the same obligation, is the single most important number for anyone reading a Chicago permit history. A follow-up in June 2024 found the Department had not implemented the corrective action the audit recommended.
Most residential permit work falls on the low side of that split. The permit that replaced a two-flat's porch, rewired its second floor or finished its basement is in the category where the audit measured 16.7%.
The code underneath, and the fact that it was renumbered
Behind all of this sits the code — the body of adopted law setting out what may be built, how, and to what standard. Chicago's construction code is unusual among American cities in being locally written rather than a lightly amended model code, and in 2019 the City rewrote and renumbered it. The Chicago Construction Codes were adopted by City Council on April 10, 2019, began phasing in that June, and became mandatory for most permit applications started on or after August 1, 2020.
The renumbering moved the administrative provisions into Title 14A, the building code into Title 14B, the rehabilitation code into Title 14R, and the minimum requirements for existing buildings into Title 14X. Everything published before that cites Title 13, and a great deal of material still posted on the City's own site does too. The practical consequence for a reader is narrow but constant: a Title 13 section number appearing in an older record, an older violation notice or an older City guidance document is a historic citation, not a statement of the law as it stands.
This also dates the record. Because the published datasets begin in 2006 and the recodification lands in 2019–2020, a single property's file can straddle two numbering systems while describing one continuous building.
How the system becomes visible to the public
The department's output reaches the public mainly through the Chicago Data Portal, the City's open-data site, where building permits and building violations are each published as a dataset updated daily. The City also maintains Building Permits Search — a guided search interface built over the permit data, rather than a dataset of its own — which is how most non-specialist readers first encounter a property's permit history.
The field that carries the route is called REVIEW_TYPE, which the City defines as the "process used to review permit application." A field here means a labelled column the City attaches to every row, with its meaning documented in the dataset's own metadata. REVIEW_TYPE is the single most useful column in the permit data for the question this site asks, and it is almost never read.
There is also a fifth name in circulation. The permit dataset's documentation singles out an Express Permit Program in its description of the issue-date field, and the Department's current porch and demolition pages use the same term. Whether Express Permit Program is the Easy Permit Process renamed, or a separate thing, could not be established from primary sources — so it should be treated as an open question rather than resolved in either direction.
Source: Building Permits dataset metadata, City of Chicago.
What the structure means for reading the output
Put the pieces together and a specific reading discipline follows. Two permits on the same street, for similar work, in the same year, printed in the same format, can represent completely different levels of scrutiny — one examined by City plan reviewers, one certified by a private professional, one issued over the counter against a description of work and a contractor's signature. The record's uniform appearance is an artifact of how the data are published, not evidence that the underlying review was uniform.
So the questions worth asking of any Chicago building record are structural rather than factual. Which route produced it, and therefore who read the drawings. Whether an inspection record exists separately, since the permit will not say. Which code era it belongs to, since its section numbers may have been superseded. And which department's decision it actually reflects, since zoning, landmarks and construction review are different gates reached through one application.
None of this makes the record worthless. It makes it narrow. A Chicago building record is a reliable account of what the City was told and what the City authorized, and a far less reliable account of what was built.