How Cash Offers Are Calculated in Michigan

Most cash home buyers refuse to explain how they arrive at their offer. We're going to do the opposite. After reading this, you'll know exactly how Michigan cash offers are calculated — including ours — and you'll be able to evaluate any offer for fairness.

The 70% Rule Formula (Explained Simply)

The "70% Rule" is the industry standard for how cash home buyers calculate offers. It's not a Diamond Home Buyers thing — it's how every legitimate cash investor in Michigan and across the country prices deals.

Component	What it means
ARV (After-Repair Value)	What the home would sell for on the open market in fully renovated, market-ready condition
× 70%	The buffer that covers buyer's holding costs, transaction fees (closing, title, transfer taxes), realtor commissions on resale, and profit margin
− Repair costs	What it'll actually cost to bring the home to ARV condition (materials + labor)
= Cash Offer	What you receive at closing

Why 70% and not, say, 90%? Because the 30% buffer needs to cover real costs:

• ~6% realtor commission when the buyer eventually resells
• ~3% closing costs and title fees on resale
• 3-6 months of holding costs (taxes, insurance, utilities, loan interest if leveraged)
• Unknown repair surprises (every flip has them)
• Market risk (what if Michigan home prices dip during the project?)
• Acceptable profit margin to make the business viable

If a "cash buyer" offers you 90% of ARV, one of two things is true: (1) they're a wholesaler who'll try to assign the contract to an actual buyer at a markup (and the deal often falls through), or (2) they're inexperienced and will renegotiate before closing. Either way — be cautious.

How ARV Is Determined

After-Repair Value isn't a guess. We pull 3-5 recent comparable sales (comps) from the same Michigan neighborhood. The comps need to be:

• Sold (not listed) — actual closed prices
• Within the last 6 months
• Within 0.5 miles of the subject property (or in the same subdivision)
• Similar in size (within 20% of square footage)
• Similar in age and style (1950s ranch vs 1990s colonial = different markets)
• Adjusted for features — extra bedroom, finished basement, garage, lot size differences

Michigan's real estate markets vary wildly. ARV in Birmingham (Oakland County) might be $650/sq ft. ARV in parts of Detroit might be $50/sq ft. Same house, very different numbers — because the comps are different.

How Repair Estimates Work

This is where most homeowners get suspicious — "are they overestimating repairs to lowball me?" Fair concern. Here's how legitimate repair estimates are built:

Repair	Typical Michigan cost
Roof replacement (asphalt shingle, 2,000 sq ft)	$8,000-$14,000
Furnace replacement	$3,500-$6,500
Central A/C replacement	$4,000-$7,000
Water heater replacement	$1,200-$2,500
Full kitchen remodel	$15,000-$45,000
Full bathroom remodel	$8,000-$20,000
New flooring (1,500 sq ft, mid-grade LVP)	$6,000-$12,000
Interior paint (whole house)	$3,500-$7,000
Exterior paint or vinyl siding	$8,000-$18,000
Foundation repair (typical crack)	$3,000-$10,000
Sewer line replacement	$5,000-$15,000
Mold remediation (severe)	$5,000-$25,000
Fire damage restoration	$25,000-$100,000+

If you want to verify our repair estimate, get a contractor quote yourself. Bring it to us. If your number is significantly lower than ours, we'll talk through it — sometimes we adjust, sometimes we explain why we're seeing additional issues you didn't.

Real Michigan Examples (3 Cities)

Example 1: Detroit (East English Village neighborhood)

• 3 BR / 1.5 BA brick bungalow, 1,200 sq ft
• Comps: $145,000-$170,000 in renovated condition
• ARV: $155,000
• Estimated repairs: $35,000 (kitchen, bath, flooring, paint, HVAC tune-up)
• Math: ($155,000 × 70%) − $35,000 = $73,500 cash offer

Example 2: Birmingham (Quarton Lake area)

• 4 BR / 2.5 BA colonial, 2,400 sq ft
• Comps: $625,000-$695,000 in renovated condition
• ARV: $660,000
• Estimated repairs: $80,000 (kitchen, two baths, flooring, paint, exterior)
• Math: ($660,000 × 70%) − $80,000 = $382,000 cash offer

Example 3: Grand Rapids (Eastown)

• 3 BR / 1 BA arts & crafts bungalow, 1,400 sq ft
• Comps: $290,000-$330,000 in renovated condition
• ARV: $310,000
• Estimated repairs: $42,000 (kitchen, bath, flooring, electrical update, paint)
• Math: ($310,000 × 70%) − $42,000 = $175,000 cash offer

What Changes the Offer (Up or Down)

The 70% rule is a starting point. Real offers move based on:

Things that push offers UP

• Hot Michigan submarket (Ann Arbor, Birmingham, Royal Oak — homes resell quickly)
• Lower repair scope (cosmetic only)
• Clean title, no liens
• Vacant property (no tenant transition)
• Flexible closing date
• Investor competition for similar properties in the area

Things that push offers DOWN

• Slow Michigan submarket (parts of Flint, Saginaw, certain Detroit zones)
• Major structural issues (foundation, roof, fire/water damage)
• Title issues, liens, code violations
• Tenant-occupied (especially with lease in place)
• Required quick close (under 7 days adds urgency premium)
• Hoarder conditions (cleanout costs add up)

Cash Offer Myths Debunked

Myth 1: "Cash buyers all lowball you."

Some do. Most legitimate Michigan cash buyers follow the 70% rule consistently. The "lowball" feeling usually comes from comparing cash offers to retail listing prices (apples to oranges). The fair comparison: cash offer vs. net proceeds from a traditional sale (after commissions, repairs, holding costs, and 3-6 months of carrying costs).

Myth 2: "I can negotiate cash buyers up significantly."

Some negotiation is possible (5-10% sometimes), but cash buyers operate on tight margins. If we move our offer up 30%, the deal stops working. We'd rather walk away from a deal than overpay and lose money.

Myth 3: "Cash buyers don't pay anything for repairs."

True — we don't ask you to make repairs. But we do pay for them in our offer (the cost is built into our calculation). The repair cost reduces what we offer, but it removes that burden from you.

Myth 4: "All cash buyers in Michigan are scams."

Most aren't. But there are red flags to watch for. See our 50-point verification checklist.

Is My Offer Fair? Decision Framework

Use this 3-step framework to evaluate any Michigan cash offer:

1. Get the ARV: Look up sold comps on Zillow, Redfin, or Realtor.com — same neighborhood, last 6 months, renovated condition. Take the average.
2. Estimate repairs: Walk through your home and add up the categories from the table above. Or get a contractor quote.
3. Run the formula: (Your ARV × 70%) − your repair total. Compare to the offer.

If the offer is within 10-15% of your formula result, it's in the fair zone. If it's lower than that, push back and ask for the buyer's math. If they can't or won't show you their numbers, walk away.

Try Our Michigan Cash Offer Calculator

We built a free calculator that runs the exact same math we use. Plug in your address, condition, and it shows your estimated cash offer range.

Open the Cash Offer Calculator →

Calculator results are estimates based on the 70% rule formula and typical Michigan repair costs. Actual offers depend on property-specific factors and current market conditions. Diamond Home Buyers commits to fully transparent offers — we'll always show you our math.