Working Backward From Resale Value to Your Fixer Offer
Learn how to work backward from after-repair value to the most you should offer on a fixer, with repair, holding, and selling costs plus a worked example.
Most fix-and-flip mistakes happen before the first repair. The buyer starts with the asking price, adds a little for repairs, and hopes the resale number is high enough. Working backward flips that order. You start with what the finished house will sell for, subtract every cost between now and the closing table, and whatever remains is the most you can pay.
Start with a defensible resale value
Your starting point is the after-repair value (ARV), the price a comparable home in the same condition would likely sell for today. Pull recent sales of similar homes that are already renovated to the standard you plan to hit, not the average home on the block. Adjust for size, bedrooms, lot, and layout, and be skeptical of comps that sold months ago in a shifting market. You can build the comp set quickly with the ARV calculator, then sanity-check it against what buyers actually paid.
Use a conservative figure. If your comps cluster between $295,000 and $310,000, underwrite at the lower end.
Build the full cost stack
Every dollar between your offer and the sale price belongs in one of four buckets:
- Repair budget: Materials, labor, permits, and a contingency. Add 10 to 15 percent to your contractor's estimate, because hidden problems such as wiring, plumbing, or foundation issues show up after demolition.
- Holding costs: Property taxes, insurance, utilities, and loan interest for every month you own the property, including the time it sits on the market.
- Selling costs: Agent commissions, seller closing costs, transfer taxes where applicable, and any concessions buyers may request.
- Acquisition closing costs: Title, recording, and other fees you pay when you buy.
Then add the profit you need. This is the number most beginners leave out. Set it as a dollar amount tied to risk, and many investors use 15 to 20 percent of ARV as a floor, with more for longer timelines or unfamiliar markets.
The formula
Maximum offer = ARV minus selling costs, minus repairs, minus holding costs, minus target profit, minus acquisition closing costs.
Every input is an estimate, so the output is only as good as your assumptions. Run the math before you make an offer, not after.
Worked example
Say a three-bedroom house in a neighborhood of similar renovated homes has an ARV of $300,000. Your inputs are:
- Repairs: $42,000 scope plus $6,000 contingency, for $48,000
- Holding costs: about 6 months at $1,000 per month for taxes, insurance, and utilities ($6,000), plus about $10,000 in loan interest and points, for $16,000
- Selling costs: 8 percent of $300,000, for $24,000
- Target profit: 15 percent of $300,000, for $45,000
- Acquisition closing costs: $5,000
Total deductions are $48,000 + $16,000 + $24,000 + $45,000 + $5,000 = $138,000. Subtract that from the ARV: $300,000 minus $138,000 gives a maximum purchase price of $162,000.
Check it in reverse. Purchase at $162,000, add $5,000 in closing costs, $48,000 in repairs, $16,000 in holding costs, and $24,000 in selling costs. The total is $255,000. Sell at $300,000 and you keep $45,000, which is 15 percent of ARV. The math holds.
Now test the sensitivity. If comps soften and the ARV drops to $280,000, selling costs fall to $22,400 and a 15 percent target becomes $42,000. Total deductions become $22,400 + $48,000 + $16,000 + $42,000 + $5,000 = $133,400, and the maximum offer drops to $146,600. A $20,000 change in ARV moves your offer by $15,400, so the resale estimate deserves the most scrutiny.
Where investors go wrong
The most common error is anchoring the offer to a number that feels competitive, then reverse-engineering the profit. Another is underestimating holding time, especially when permits or contractor delays stretch the timeline. A third is ignoring that a higher offer also raises your loan interest and points, which means the formula should be recalculated at each candidate price.
If the maximum offer falls below what sellers will accept, the deal is not a deal at your assumptions. Walk away, or find a property with a lower acquisition price or a smaller repair scope.
The offer you can justify is the one that still pays you after every cost is counted, not the one that wins the bidding.
Run the formula on a few properties before you fall in love with one. Plug in your own comps, contractor numbers, and loan terms, and let the spreadsheet tell you where the walk-away price sits.