If you've ever typed "we buy houses" into Google, you've seen the same yellow signs and the same vague promises. Some of those operators are legitimate. Some are not. After fifteen years working in Chicagoland real estate as a licensed Illinois Managing Broker, here's the short answer: legitimate cash buyers calculate offers using After-Repair Value × roughly 70%, minus repair cost. They close in seven to fourteen days. They don't ask for money up front. And they make money on the spread between what they pay you and what they sell the renovated home for. That's the whole business model. Below is how the math actually works, what the closing process looks like step by step, and the specific red flags that tell you whether you're talking to a real operator or a chain that's going to disappear after you sign.
How a legitimate cash buyer calculates your offer
Almost every professional cash buyer in the country uses some version of the 70% rule. It isn't a law — it's a rule of thumb the industry settled on because it builds in enough margin to survive when something goes wrong on the renovation side. Here are the pieces:
ARV — After-Repair Value
ARV is what your house would sell for fully renovated on the open market. A buyer figures this out the same way an agent or appraiser would: by pulling comps — recent sales of homes in your neighborhood that are similar in size, age, and condition (post-renovation). If three comparable houses on your block sold for $395K, $405K, and $410K in the last six months, the ARV is roughly $400K.
This is the most important number in the entire calculation. If the buyer can't tell you the comps they used, that's a problem.
The 70% multiplier
Once ARV is set, the buyer multiplies it by approximately 0.70. That 30% gap covers:
- Acquisition costs (closing, title, transfer taxes)
- Holding costs during the renovation (taxes, insurance, utilities, sometimes interest on hard-money loans)
- Selling costs when they resell (agent commission, staging, closing costs on their side)
- Investor margin — the actual profit, which is usually 8–12% of ARV, not 30%
The 70% is conservative. In hot markets, sophisticated buyers will stretch to 72–75%. In slower markets, or for harder-to-resell properties, they tighten to 65–68%.
Repair estimate
The buyer walks the property and estimates what they need to spend to bring it to ARV condition. Cosmetic refresh (paint, flooring, kitchen tune-up) might be $15–25K. A full gut with mechanicals, roof, and additions can be $80–150K+. On older Chicagoland housing stock, the most common surprises are foundation, sewer line, knob-and-tube wiring, and asbestos remediation.
The formula
Maximum Allowable Offer (MAO) = (ARV × 0.70) − Repair Cost
Worked example:
- ARV: $400,000
- Multiplier: 0.70
- Repair estimate: $30,000
- MAO: ($400,000 × 0.70) − $30,000 = $250,000
That's the offer. A transparent buyer will write it out for you on paper, show you the comps that built the ARV, and walk you through line items in the repair scope. A black-box buyer will just hand you a number and pressure you to sign.
Why is a cash offer lower than market value?
Let's be honest about this, because it's the single biggest reason people get suspicious. A cash offer is almost always lower than what an agent would list your home for. That's not a scam — it's a different transaction.
When you sell to a cash buyer, you are trading dollars for:
- Speed. Seven to fourteen days vs. 60–120 days on the open market.
- Certainty. No financing contingency. No buyer's appraisal coming in low. No inspection-renegotiation cycle. No deal falling apart two weeks before closing.
- As-is. No repairs. No staging. No twenty showings. No open houses with strangers walking through your bedroom.
- Zero fees. No 5–6% agent commission. No seller-paid closing costs in most cases. No prep costs.
For some sellers — someone facing a foreclosure sale date, an out-of-state heir on an inherited home, an owner whose house needs $80K in repairs they can't fund — that tradeoff is the right one. For a clean, market-ready home with no time pressure, listing on the MLS will almost always net more money. A legitimate cash buyer will tell you that. We tell people regularly that if their situation allows for it, an agent is the better path.
How does a cash home sale actually close, step by step?
Once you accept an offer, here's the realistic timeline. No magic, no shortcuts — just paperwork moving through standard channels.
1. Initial call or form submission. You describe the property, the situation, and the timeline. A real buyer asks specific questions: square footage, year built, condition, occupancy status, any known issues (foundation, roof, sewer, electrical), and what you're trying to accomplish. This call should take 10–15 minutes.
2. Walkthrough. In person if possible, virtual (FaceTime/video) if you're out of state or it's an inherited property you don't live in. The buyer is looking at structure, mechanicals (HVAC, electrical, plumbing), roof, foundation, and the scope of cosmetic work. This is not a formal inspection — it's an estimating walk.
3. Written offer. You get the number in writing, with the math broken out. A real buyer will show you ARV (with comps), repair estimate, and the MAO calculation. The offer document is typically a short purchase agreement — three to ten pages — written in plain English.
4. Contract signed. Standard contracts include an inspection or due-diligence period, usually 7 to 10 days, during which you (or the buyer) can back out for almost any reason. This protects both sides.
5. Title work. A title company runs a lien search, confirms ownership, and clears anything outstanding (unreleased mortgages, judgments, mechanic's liens, back taxes). On Chicagoland properties this usually takes a week. Probate, divorce, or quitclaim issues add time.
6. Closing day. You sign the deed and the settlement statement. The title company wires the net proceeds to you. Existing mortgages get paid off directly from the closing proceeds — you don't have to chase the bank. Closing can happen at the title company's office, at your kitchen table with a mobile notary, or even fully remote with electronic signatures in some cases.
That's it. There is no "appraisal" you need to pay for. There is no "processing fee" you need to wire. The buyer pays the closing costs (title, recording, transfer taxes are typically buyer-paid in this kind of sale).
What are the red flags of a fly-by-night cash home buyer?
This is the part that matters. Most complaints filed with the Illinois Attorney General and the Better Business Bureau against "cash home buyer" companies share the same handful of patterns. If you see any of these, walk away:
They ask for money up front. Any version of this — "application fee," "appraisal deposit," "processing fee," "earnest money you pay us" — is a scam, full stop. A legitimate cash buyer never asks the seller for money. The money flows one direction: from the buyer to you, at closing.
They won't share their business entity, license, or address. A real buyer has a real LLC or corporation, registered with the Illinois Secretary of State, with a physical address you can verify. If they're operating as a licensed broker (or have a broker on staff), they're searchable in the Illinois Department of Financial and Professional Regulation (IDFPR) license lookup. If they can't or won't give you those details, you have no recourse if anything goes wrong.
They refuse to put the offer in writing or walk through the math. "Trust me, this is a fair number" is not an offer. A real buyer puts the number on paper with comps and a repair scope, and explains every line.
They pressure you to sign on the spot. Predatory operators use a script: "this offer is only good today," "we can close tomorrow but we need you to sign now." Real buyers expect you to take a day, talk to family, even talk to an attorney. The number doesn't evaporate overnight.
They want you to sign an "assignment" contract without explaining it. Wholesaling — where a buyer signs a contract with you and then assigns that contract to a different end-buyer for a fee — is legal in Illinois, but you have the right to know it's happening. If the contract says the buyer can assign their rights to "buyer or assigns" and they won't explain who actually shows up at closing, that's a problem.
No local presence. Out-of-state chains often run national lead-generation funnels and then sell your information to the highest-bidding investor in your area — sometimes through three or four hands. By the time someone shows up to walk the property, the original number has been chopped twice. Local matters because it means the person making the offer is the person closing on it.
No professional license, no broker accountability. In Illinois, working with a licensed real estate broker (or a cash buyer who is also a licensed broker) means there's a regulatory body — IDFPR — that you can complain to if the broker violates the Illinois Real Estate License Act of 2000 (225 ILCS 454). That's a real lever. Unlicensed cash buyers have no equivalent oversight outside of standard consumer protection law.
At Atlas Chicago we're a licensed Illinois operation and the principal is a Managing Broker — that's not a sales pitch, it's the accountability layer you should look for in any buyer you talk to. The license isn't required to buy houses, but it should tell you something about how seriously the operator takes their reputation.
When does a cash sale actually make sense (and when doesn't it)?
Here's the framework I give people who call us when they're not sure.
A cash sale probably makes sense if:
- You have a hard deadline — a foreclosure sale date, a divorce decree, a job relocation, a probate timeline.
- The house needs serious work — $30K+ in deferred maintenance, system replacements, or structural issues you can't fund.
- You can't manage 20+ showings, an open house, and a 90-day listing — whether because of work, health, distance, or family logistics.
- The house is inherited and multiple heirs need a clean, fast split of the proceeds.
- The property is occupied by a tenant who won't cooperate with showings, or is in a condition that won't pass an FHA appraisal.
A cash sale probably doesn't make sense if:
- The house shows well and you have 90+ days. You'll net more on the MLS.
- You're not under time pressure and the property doesn't need major work.
- Family members disagree on price expectations and one heir believes the cash number is "too low." That conversation needs to happen with a real agent's CMA before anyone signs anything.
- You're emotionally attached to a specific price the home isn't worth — a cash buyer can't bridge that gap and shouldn't pretend to.
If you're facing a foreclosure timeline specifically, our pre-foreclosure resource page walks through the Illinois-specific timeline and your options before the auction date.
Bottom line
Cash buying is a real, legal, established part of the real estate industry. Done right, it solves problems that the open market can't — speed, certainty, as-is sales — for sellers whose situations need exactly that. Done wrong, by an unlicensed chain with no accountability, it leaves sellers with a closing price 20% below where it should have been and no one to call when something goes sideways.
The math isn't a secret: ARV × 0.70 minus repairs. If a buyer can walk you through that calculation, show you comps, hand you a written offer, and answer specific questions about who they are and how they operate — they're real. If they can't, keep looking.
If you'd like to see what selling could look like on your specific property, we'll run the comps, walk through the repair estimate with you on the call, and put the number in writing. No fee, no pressure, no obligation. If a list-with-an-agent path makes more sense for your situation, we'll tell you that too. You can also reach out directly with questions before any walkthrough — sometimes a 10-minute conversation is all someone needs to figure out which path is right.