How to calculate ARV, rehab and MAO the way cash buyers do

Pick comps like an appraiser, estimate rehab per square foot, and compute maximum allowable offer. Includes the 70% rule, when to break it, and the mistakes that kill deals.

Updated 2026-08-20 · 8 min read · Offr AI

ARV in one line

ARV is what the house sells for, fully renovated, to a retail buyer, today. Not the Zestimate. Not the tax assessment. Not what the seller thinks.

Comp selection rules

Use sold comps only, and require:

  • Distance: within 0.5 miles in a suburb, 1 mile rural, 0.25 miles in a dense urban grid — never across a highway, school district line or subdivision boundary.
  • Recency: sold in the last 90 days; stretch to 180 only if the market is thin, then adjust for trend.
  • Similarity: ±20% square footage, same bed count, same story count, same lot type, built within ~10 years.
  • Condition: the comp must be *renovated*. Comping to another distressed sale gives you an as-is value, not an ARV.

Take 3–5 comps, compute price per square foot, drop the outliers, and multiply the median by your subject's square footage. Sanity-check the result against the top of the neighborhood's recent range — ARV rarely exceeds the best sale on the block.

Rehab estimating without a contractor

Scope$/sq ftTypical items
Light cosmetic$15–$25Paint, carpet, fixtures, landscaping
Standard flip$30–$45Kitchen, two baths, LVP throughout, HVAC
Heavy$50–$85Roof, electrical, plumbing, foundation, layout changes

Add line items on top for big-ticket surprises: roof $8k–$15k, HVAC $6k–$10k, sewer line $5k–$12k, foundation $10k–$30k.

MAO

MAO = (ARV × buyer margin) − Repairs − Your assignment fee

  • 0.70 for competitive, on-market, retail-facing deals.
  • 0.75 for off-market deals with a clean title and no competing offers.
  • 0.80 for turnkey rental buyers in strong-rent markets who care about cash flow, not flip margin.

Worked example. ARV $220,000 · Repairs $40,000 · Fee $10,000. At 70%: (220,000 × 0.70) − 40,000 − 10,000 = $104,000. At 75%: (220,000 × 0.75) − 40,000 − 10,000 = $115,000 — the number that actually wins off-market contracts.

Run it instantly in the free fix and flip calculator.

The four mistakes that kill deals

  1. Using active listings instead of sold comps (sellers ask, buyers pay).
  2. Comping a 1,000 sq ft house to a 1,900 sq ft house on price-per-foot alone.
  3. Forgetting holding, closing and selling costs — 8–12% of ARV on a flip.
  4. Padding rehab so heavily that every offer you make is insulting and nothing ever gets signed.

Frequently asked questions

What is the formula for ARV?
ARV = median price per square foot of 3–5 renovated, recently sold comparable homes × the subject property's square footage, adjusted for lot, condition and neighborhood ceiling.
What is MAO in wholesaling?
Maximum Allowable Offer = (ARV × buyer margin, usually 0.70–0.75) − estimated repairs − your assignment fee.
Is the 70% rule still accurate?
It is a floor for competitive markets. On off-market deals with no bidding, buyers regularly accept 75–80% of ARV minus repairs, especially rental buyers.

Run this on real deals today

Offr AI turns a plain-English buy box into 25+ distressed, off-market properties with owner phone numbers, ARV, rehab range, max offer, the contract and the script. Three searches free.