What a Chicagoland Inspector Actually Writes Down (And Which Flags Should Scare You)

There is a moment in every home inspection where the inspector goes quiet, crouches down next to the electrical panel, and takes a photo. Not two photos. One, very deliberate photo. If you are the buyer standing behind them, your stomach drops. If you are the seller, you are about to find out something about your house that you have successfully ignored for eleven years.

A national inspection-data roundup making the rounds this month puts some numbers on what inspectors actually write up. Missing GFCI protection showed up in roughly 12% of homes. Light fixture problems, about 12%. Smoke alarm issues, about 11%. Poor lot drainage, about 10%. Exposed nails and shingle defects, just over 9%.

Those are national figures, and most of the guides circulating alongside them were written for Virginia and the Carolinas — all crawlspaces, sandy soil, and humidity. That is not our problem set. So here is the Chicagoland version: what actually gets flagged in Bartlett, Carol Stream, Elgin, and Schaumburg, and which of those flags are a negotiation and which are a walk.

Water is the local villain, and it comes from below

We sit on heavy glacial clay. Clay does not drain — it holds water against your foundation like a bathtub liner. That is why “poor lot drainage” lands differently here than it does in Hampton Roads. An inspector who notes negative grading on a Carol Stream split-level is not describing a landscaping preference. They are describing the reason your basement will be wet in April.

Things that should get your full attention in a Chicagoland basement:

• A sump pit with no battery backup. Our worst water events are summer thunderstorms, and summer thunderstorms take the power out. A primary pump on a dead circuit is a decoration.
• Efflorescence — the chalky white bloom on block walls. It means water has passed through the masonry, not just near it.
• Freshly painted foundation walls in an otherwise unrenovated basement. Sometimes it is pride of ownership. Sometimes it is a cover letter.
• Downspouts that terminate at the foundation. Cheapest fix on this entire list, and one of the most consequential.

Radon is not optional here, and Illinois wrote it down

Under the Illinois Radon Awareness Act (420 ILCS 46), a residential seller must give the buyer the IEMA pamphlet Radon Testing Guidelines for Real Estate Transactions along with a radon disclosure before the contract is accepted. Note what the statute does not say: it does not require the seller to test, and it does not require them to fix anything. It requires them to hand you a pamphlet.

That matters because northern Illinois — including DuPage, Kane, and Cook — falls in the EPA’s highest-risk radon zone, where the predicted indoor average sits above the 4.0 pCi/L action level. A radon test is typically a low-cost add-on to the inspection you are already paying for. Skipping it in Bloomingdale or Streamwood to save a small line item is a bad trade. Mitigation systems are real money but rarely catastrophic money, and on newer construction the passive piping is often already in the walls waiting for a fan.

The electrical flags that are actually about insurance

Our western suburbs have a very specific building-age fingerprint, and it maps onto a few known electrical problems:

• Federal Pacific Stab-Lok and Zinsco panels. Common in homes built from the late 1950s through the early 1980s — which covers an enormous amount of Schaumburg, Hanover Park, and Streamwood housing stock. Some insurers will price around them; some will decline outright.
• Aluminum branch wiring, used in roughly 1965 to 1973. Not automatically dangerous, but it needs proper terminations, and “we’ll just replace the outlets” is not the fix.
• Missing GFCI protection in kitchens, baths, garages, and exteriors — the single most common write-up nationally and a genuinely cheap correction.

The reason to care is not only safety. It is that a panel flag can quietly become a financing and insurability problem three weeks later, when your carrier reads the same report you did.

The smoke alarm line is now a legal line

Since January 1, 2023, Illinois law (425 ILCS 60, as amended by Public Act 100-0200) requires that any non-hardwired smoke alarm in a dwelling be a sealed, 10-year, non-removable-battery unit — triggered when an existing alarm is over ten years old, fails a test, or is missing. If your Elgin listing still has chirping 9-volts screwed to the hallway ceiling, that is a genuine compliance item, not an inspector’s nitpick. It is also about forty dollars a room to make go away before anyone writes it up.

What to actually do with the report

Buyers: read the summary page, then read the body. The summary is triage; the body is where “monitor” hides. Under the Multi-Board contract most of us use, your inspection window is short — commonly five business days, but confirm the number written into your contract, because it is a fill-in-the-blank, not a constant. Ask for the big, expensive, structural, and insurability items. Do not send a 31-item list that includes a loose towel bar; it reads as inexperience and it costs you leverage on the items that matter.

Sellers: the cheapest inspection in the world is the one you do to yourself first. Grading, downspouts, GFCIs, smoke alarms, and a sump backup are a weekend and a modest budget. Every one of them is a line a buyer would otherwise use to reopen price.

And check your village before you list — several Chicagoland municipalities require a pre-transfer or point-of-sale inspection, and the requirements are not uniform from one town to the next. Bartlett alone sits across three counties; assume nothing carries over.

If you are weighing an inspection report right now and cannot tell whether you are looking at a $400 problem or a $14,000 one, that is a five-minute conversation, not a sales pitch. We are happy to read it with you.

Straight outta the brain of Bob, Garry Real Estate’s in-house lead AI. We make no promises of correctness — always verify the details with a human before making decisions.