What Is a Fair Cash Offer for a House? How Illinois Investors Calculate It

Published by TruOffer LLC | truoffer.co

When you receive a cash offer for your home, one question always comes up: Is this fair?

It's a reasonable question — and a smart one to ask. Cash offers from investors are typically below retail market value, and that's by design. But "below market" doesn't mean unfair. Understanding how investors actually calculate their offers helps you evaluate what you're being shown and make an informed decision.

Here's a transparent look at the math behind cash offers in Illinois — including exactly how companies like TruOffer calculate what we can pay.

The Foundation: After-Repair Value (ARV)

Everything starts with ARV — the price a fully renovated, move-in-ready version of your home would sell for on the open market today.

To calculate ARV, investors (and appraisers) look at recent comparable sales:

- Homes within a close radius of your property

- Similar square footage, bed/bath count, and lot size

- Sold within the last 6–12 months

- In similar or better condition

In Central Illinois markets like Champaign, Springfield, Bloomington-Normal, and Decatur, ARV comps can vary dramatically based on neighborhood, school district, and proximity to employment centers. A 3-bedroom house in one part of Decatur might comp at $95,000. The same house on the other side of town might be $75,000.

That's why local knowledge matters. A cash buyer who actually operates in Central Illinois will run real comps — not rely on Zillow estimates, which are notoriously inaccurate in downstate Illinois markets.

Estimating Rehab Costs

The next major input is repair and renovation costs. Cash buyers purchase homes as-is, which means we're taking on whatever condition the property is in.

Typical rehab categories:

- Cosmetic (light): Paint, flooring, fixtures, landscaping — roughly $15–$25 per square foot

- Moderate: Kitchen/bath updates, HVAC service, windows — roughly $30–$45 per square foot

- Heavy: Foundation, roof, structural, full kitchen/bath gut — $50–$75+ per square foot

A 1,400 square-foot house needing a moderate rehab might require $45,000–$60,000 in work before it's retail-ready. That cost comes directly off what an investor can offer.

The 70% Rule (and Why It Exists)

A common starting framework used by real estate investors is the "70% rule":

> Maximum Offer = (ARV × 70%) − Rehab Costs

The 30% buffer covers:

- Holding costs (property taxes, insurance, utilities while rehabbing — typically 3–6 months)

- Selling costs when the investor eventually sells (agent commissions, closing costs — 7–9%)

- Profit margin (otherwise no investor stays in business)

- Risk buffer (rehab surprises, market shifts, appraisal gaps)

Example:

- ARV: $120,000

- Estimated rehab: $30,000

- Max offer: ($120,000 × 0.70) − $30,000 = $84,000 − $30,000 = $54,000

That might sound like a big discount off ARV. But compare it to your actual net from a retail sale:

- ARV sale price: $120,000

- Minus 6% agent commissions: −$7,200

- Minus 2% seller closing costs: −$2,400

- Minus repairs/staging before listing: −$15,000 (conservative)

- Minus 4 months of carrying costs: −$4,000

- Net retail: ~$91,400

Versus the cash offer net: $54,000 (no repairs, no commissions, no carrying costs, no uncertainty).

The gap is real — but it's often smaller than sellers initially assume, especially for homes needing significant work.

Factors That Increase or Decrease a Cash Offer

Factors that push offers higher:

- Property in better condition than expected

- Strong comparable sales in the immediate area

- Seller flexibility on closing date (investors prefer a quick close)

- Low or no deferred maintenance

Factors that reduce offers:

- Foundation issues, water intrusion, roof at end of life

- Location in a slower-selling area of Central Illinois

- Title complications, liens, or estate situations

- Extensive cosmetic neglect (hoarder situations, smoke/pet damage)

What Makes an Offer "Fair"?

Fair doesn't mean retail. Fair means:

1. The investor has done real homework on comparable sales — not a guess

2. The rehab estimate is based on an actual assessment, not a lowball grab

3. The offer is defensible — the investor can show their math if asked

4. There's no bait-and-switch (offer doesn't drop significantly after an inspection)

At TruOffer, we're happy to walk through how we calculated any offer we make. If you're evaluating an offer from us or any other cash buyer in Illinois, ask them to show you their comps and their rehab estimate. A legitimate buyer won't hesitate.

When a Cash Offer Makes the Most Sense

Cash offers deliver the most value relative to retail when:

- The home needs significant repairs — repairs the seller doesn't want to fund or manage

- Speed is critical — foreclosure timeline, relocation, estate settlement

- Certainty matters — a cash deal doesn't fall through due to financing

- The property is in a slower market — rural Central Illinois, secondary cities where retail buyer pools are thin

If you're in Champaign, Springfield, Bloomington, Decatur, or the surrounding communities, TruOffer can give you a real number based on real data — no obligation.

Get a Transparent Cash Offer

We'll show you our math. If it works for you, great. If not, no pressure.

Request your free cash offer at truoffer.co →

TruOffer LLC buys houses as-is for cash across Central Illinois. We're local investors — not national wholesalers — and we stand behind every offer we make.