Illinois requires those selling FSBO to fill out and file many documents and forms. Several of these documents are legally binding agreements.Selling a house without a realtor involves preparing prelisting, listing, disclosure, negotiation, and closing paperwork. Legal help can be beneficial. Stage the House for Sale. First impressions matter. For Sale By Owner (FSBO) is a sale where an Illinois homeowner sells their property without involving a listing or real estate agent. We want to help you sell your home for cash in Illinois as soon as a week and on your timeline. We'll make you a fair offer to buy with no obligation. Let's take a closer look at how to sell a house "as is" in Illinois, your options for getting an offer, and what to expect from the process.