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Most of Chicago's housing was built before your grandparents were born, and that is a feature, not a bug. Old homes here were built from brick, stone, and old-growth lumber by people who expected them to last a century. They have. This guide explains how they were built, where they hide their problems, and what to check before you fall in love. Explore the building below, then read on for the era-by-era pitfalls, and follow the links to the full styles field guide and the split-face block guide.
The two-flat is Chicago's signature building: a brick box with two stacked apartments, built by the tens of thousands between 1900 and 1930, often by immigrant families who lived in one unit and rented the other. Nearly everything about how it looks was decided by the Great Fire of 1871, the building codes that followed, and the economics of a 25-foot lot. Hover over or tap each part of the building to see what it is, how it was built, and why.
Hover over or tap each part of the drawing; the explanation appears beside (or below) it.
Every part above fails on its own schedule: membranes in decades, lintels in half-centuries, mortar in generations. An old Chicago building is not one big unknown, it is a short list of known systems, each with a known fix and a knowable price. Our job, with your inspector, is to put a date and a number on each one before you sign, and to use the attorney review and inspection period to negotiate the ones that are due. That is also exactly how we read a building with you at a showing, before you ever spend a dollar on an inspection.
Two chapters of this field guide are big enough to live on their own pages. The first is the field guide to Chicagoland's most common building types, from workers cottage to raised ranch, with the story of how construction itself changed from the pre-war era through the 90s boom to today. The second is the single most-asked question in Chicago condo buying: split-face block.
None of these is a reason to skip old homes, they are the reasons to inspect them well. Here is what a century of Chicago building leaves behind, and what each item means for you.
Chicago wires homes differently than nearly everywhere else: the code requires metal conduit, which turns out to be great news for old-home buyers because new wire can often be pulled through the original pipes without opening walls. Still on the checklist: service size (60-amp or a fuse box is an upgrade conversation), Federal Pacific and Zinsco panels, knob-and-tube in attics and porches, and plastic Romex cable, which in this city is the calling card of unpermitted work. The full walkthrough, with its own interactive diagram, is in Chicago Electrical, Explained.
This one gets its own guide, because Chicago plumbing has its own history, including the fact that lead water service lines were standard here right up to 1986. Read Chicago Plumbing, Explained for the full walkthrough: how to tell copper from galvanized at a showing, why a $200 sewer scope is the best money in the whole transaction, and what the city's lead line replacement programs cover.
Mortar is designed to wear out before brick does, and repointing it is normal century-home maintenance, not a defect. But bad past repairs (hard mortar smeared over soft brick, sandblasted facades, painted brick) create real damage, and rusted lintels quietly crack walls above windows. We wrote a full guide on reading a brick wall: Chicago Brick & Tuckpointing, Explained.
Solid masonry walls were built with little or no insulation, and original wood windows may be on their second century. Vintage windows can often be restored and weatherstripped for less than replacement, and top-floor and roof insulation gives the best return. Budget for comfort work, and treat "new windows throughout" in a listing as a plus worth verifying (quality varies wildly).
Pre-1978 homes are presumed to have lead paint somewhere; it matters most with kids and during renovation, and federal disclosure rules apply. Asbestos shows up as white pipe wrap on old boiler lines and in some flooring and siding, generally safe if left alone, priced work if disturbed. Radon is a simple add-on test during inspection, and mitigation systems are a solved problem. All three are manageable; all three belong on the inspection list. We wrote the full walkthrough, mold included: Asbestos, Lead, Mold & Radon, Explained.
Radiator heat is a feature: even, quiet, and durable, with boilers that can run 20 to 40 years. What you are checking is the boiler's age and service history, asbestos on old pipe runs, and, in converted buildings, how well a later forced-air system was integrated. Window AC or ductless units are the standard cooling answer in radiator buildings, and a spacepak-style retrofit is the premium one.
Chicago's flats have been endlessly combined, duplexed down, and converted. The question is always whether the current configuration is legal: a "three-flat" that is legally a two-flat affects value, financing, insurance, and your ability to rent it. We pull the permit and zoning history on any building where the listing and the layout do not obviously match.
Wood porch systems on multi-unit buildings are regulated exits, inspected and permitted, especially since the city's 2003 porch collapse tragedy. Rot at the posts, missing footings, or an obviously homemade rebuild is a real-money item, get it inspected and get the permit history.
This guide is an educational summary, not code advice or an inspection. The primary sources, if you like primary sources: the Chicago Building Code, the Chicago Building Rehabilitation Code (which governs work on existing buildings), and the Municipal Code of Chicago.
Before an inspector ever gets involved, the big tells are visible from the sidewalk: the parapet, the joints, the lintels, the sills, the porch, the roofline. We do this with you on every tour, it is free, and it filters out the money pits before you spend a dollar.
A general inspection plus a sewer scope, and on masonry-heavy or split-face buildings, a masonry-literate eye. In condos, the building's paper trail (minutes, reserves, sealing and tuckpointing history) is as important as the unit.
Everything in this guide has a market price in Chicago. During attorney review and inspection we turn findings into repairs, credits, or price, calmly and specifically. That is what the contract's inspection provisions are for.
Old-growth lumber, real masonry, high ceilings, and neighborhoods that were built around people instead of parking. Maintained old buildings routinely outlast everything built since, and now you know how to pick a maintained one.
We are real estate brokers. We are not masons, plumbers, electricians, structural engineers, architects, inspectors, or attorneys, and nothing on this page substitutes for any of them. These guides are our team's plain-English interpretation of Chicago's codes and of how local buildings behave, written to educate, and codes change and buildings surprise. Before money moves, put licensed professionals and the primary sources we link in front of your specific property. We are glad to recommend the pros we trust.
Send us the listing. We will tell you what the building is, how it was built, and what we would check, before you ever set foot inside.
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