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Real estate comps in Illinois: how Property Scan works

Property Scan makes comparative market analyses (CMAs) for licensed real estate agents. Send any Illinois address, from Jo Daviess County in the north to Massac County in the south, and get a client-ready CMA back in minutes, built from Illinois's recorded sales, with every adjustment shown.

Updated October 30, 2026 · Sources at the end

How Property Scan builds a CMA in Illinois

  1. You send the address. By email to comps@propertyscan.ai, on the website, or in Claude or ChatGPT, for a home in any of Illinois's 102 counties.

  2. It pulls the recorded sales nearby. In Illinois, each sale goes on file with the county recorder.

  3. It picks the comps and adjusts each one. For market time it uses the FHFA House Price Index for Illinois, which rose 5.6% in the four quarters to the second quarter of 2026 (how comps are chosen and adjusted).

  4. You get a client-ready PDF. Your name, photo and brokerage go on it as “Prepared by”, every adjustment is shown, and you can swap any comp.

Is Illinois a non-disclosure state?

No. Illinois sale prices are public record. The buyer and seller (or their agents) file an Illinois Real Estate Transfer Declaration (Form PTAX-203) with the deed at the county recorder, usually through the state's MyDec system. It states the 'full actual consideration (sale price)'. State and county transfer stamps are figured from it, and counties and the Department of Revenue use it to 'collect sales data' for assessment studies.

Official open data on Illinois sales:

  • Cook County Assessor: Parcel Sales'Parcel sales for real property in Cook County, from 1999 to present', with sale date, sale price, deed type and MyDec fields. Filtered, but the publisher warns it likely still includes some non-arm's-length sales.

Illinois real estate transfer tax

Illinois Real Estate Transfer Tax (state) plus county transfer tax: State: 50 cents per $500 of net consideration; county: 25 cents per $500. On Form PTAX-203: 'Divide Line 17 by 500. Round the result to the next highest whole number'; 'Illinois tax stamps — multiply Line 18 by 0.50'; 'County tax stamps — multiply Line 18 by 0.25.' (35 ILCS 200/31-1 et seq.)

Use it alongside your Illinois MLS

MLSs that serve Illinois include:

Try it on an Illinois home you sold recently. Your first 3 reports are free, no card.

Run comps on a home you sold

Sources

Facts checked October 30, 2026.