Every on-market flip in a covered county is underwritten before you log in. Here is how each number is built -- and how the accuracy is checked against real sale prices.
RE Flip Finder underwrites every on-market single-family flip in a covered county before you log in. Each listing arrives with an ARV built from recent sold comps, a rehab estimate, a projected ROI, a letter grade from A to F, and an offer number -- the most you can pay and still hit a target margin.
It shows the comps behind every number. You can open the comparable sales each ARV is built on and check the work, so the estimate is not a black box you have to take on faith.
It is a fast screening tool, not an appraisal. The point is to sort the handful of deals worth a closer look from the ones that do not pencil. Before you buy, verify the value with a licensed appraiser and confirm rehab scope with your own contractor.
Why this page exists: the fair question about any automated underwrite is whether you can trust it. So this page describes the method and the checks, not a marketing claim. Where a number cannot be built honestly, RE Flip Finder leaves it out -- and this page says so plainly.
The after-repair value is the anchor of the whole underwrite -- every other number leans on it -- so it is built from real, recent, nearby sales rather than a formula applied to a list price.
RE Flip Finder starts from recent sold comparable sales near the subject property and filters them down to houses that are genuinely alike:
Most important for trust: every deal shows the comps used. You can open the comparable sales behind an ARV, see which houses it leaned on, and decide for yourself whether the set is fair. It is a reviewable estimate, not a black box.
The purchase price is only half the cost of a flip. The rehab number is the other half, and getting it roughly right is what separates a deal that pencils from one that does not.
RE Flip Finder estimates a per-deal renovation cost from local renovation-cost data and the property's condition, rather than applying one flat dollar-per-square-foot figure everywhere. Renovation costs vary by market, so the estimate is anchored to the area the property sits in.
Treat this as a screening number that gets you in the right range. It sizes the deal well enough to grade it, but it does not replace a contractor walking the property. Before you commit, confirm the scope and the bid with your own contractor.
Once the ARV and rehab are in place, the rest is arithmetic you can follow.
RE Flip Finder projects profit and return on investment from the ARV minus the purchase price, the rehab estimate, and holding and selling costs -- financing, taxes, insurance while you hold, and the costs of selling on the back end. What is left is the projected profit, and the return is that profit measured against the cash the deal takes.
Each deal is graded from A to F so you can rank a whole county at a glance instead of reading every line item. The grade is a fast sort -- a way to push the strongest deals to the top and skip past the ones that clearly do not work -- not a verdict that replaces your own diligence.
The offer number is the maximum allowable offer: the most you can pay for the property and still hit a target margin after rehab, holding, and selling costs. It answers the practical question the grade does not -- not just "is this a good deal," but "what would I actually have to pay to make it one." Because it is built from the same reviewable ARV and rehab, you can trace exactly where it comes from.
This is the part that matters most for a serious buyer, so it is worth being precise about what "accurate" means here.
RE Flip Finder backtests its estimates against actual realized sale prices -- what homes truly sold for, not another model's guess. That is the only honest yardstick for a valuation.
The backtest is leakage-controlled. For each past sale, it only uses data that was available before that sale closed. It never lets the model peek at the answer -- the sale price, or anything that came after it -- when producing the estimate it is then graded on. That makes it a true out-of-sample test: the estimate is judged the same way it would be on a live deal today, where the eventual sale price is unknown. A backtest that quietly used post-sale data would flatter itself and tell you nothing about live performance. This one does not.
There is a second, simpler check that never leaves your hands: you can review the comps behind every number. The backtest tells us the method holds up across many past sales; the visible comp set lets you confirm any single deal for yourself. Both matter, and both are there.
What this page will not do: quote you a single accuracy percentage. A headline number pulled out of context invites false confidence, and estimate error varies by price band, county, and how much comparable data a given deal has. What we will stand behind is the method -- recent sold comps, a leakage-controlled out-of-sample backtest, and comps you can inspect on every deal.
The most important thing about the numbers is what happens when the data is not there.
When there are not enough comparable sales to be confident, RE Flip Finder leaves the number out or skips the deal rather than filling in a national-average guess. There are no fabricated defaults -- no quiet fallback to a nationwide dollar-per-square-foot figure, no placeholder rehab, no invented ARV that reads like a real answer.
This is deliberate, and it is a trust signal, not a gap. A made-up number that looks confident is worse than a blank, because you might act on it. A missing estimate tells you the truth: the data did not support one on this deal. You would rather find that out on the screen than after you have wired earnest money.
No screening tool should oversell itself, so here is where RE Flip Finder stops:
The honest frame: RE Flip Finder does the underwriting pass on every listing so you spend your time on the deals worth it -- and it shows its work so you can check any of it. It is the fast first read, not the last word.
It builds the after-repair value from recent sold comparable sales near the subject property. Comps are filtered for similar property type, beds, baths, and square footage, and matched at the subdivision level rather than just the same ZIP. Tract-builder identification keeps a custom home from being valued against a production build. Every deal shows the exact comps used, so you can review the work instead of trusting a black box.
The ARV is built from recent sold comps, and the estimates are checked with a backtest against actual realized sale prices. That backtest is leakage-controlled: for each past sale it only uses data that was available before that sale closed, so it is an honest out-of-sample test rather than fitting to answers the model already knows. On top of that, every deal exposes the comps behind the number, so you can verify each ARV against the sales it is built on. Treat it as a screening estimate and confirm with a licensed appraiser before you buy.
From recent sold comparable sales near the subject property. RE Flip Finder selects them for similar property type, beds, baths, and square footage, and prefers matches within the same subdivision, so a home is compared to genuinely similar houses rather than anything in the ZIP. The comparable sales used for each deal are shown on the deal itself, so you can open them and check them yourself.
When there are not enough comparable sales to be confident, RE Flip Finder leaves the number out or skips the deal rather than filling in a national-average guess. There are no fabricated defaults. A missing estimate means the data did not support one, which is more useful than a made-up figure that reads like a real answer.
No. RE Flip Finder is a fast screening tool, not an appraisal. It runs the underwriting pass on every listing so you can separate the deals worth a closer look from the ones that do not pencil, and it shows the comps behind every number. Before you buy, verify the value with a licensed appraiser and confirm rehab scope with your own contractor walkthrough.
RE Flip Finder covers select US counties, deepest in California, and focuses on single-family fix-and-flip. Coverage is expanding. Check reflipfinder.com for the current county list before relying on it for your market.
Open a covered county to on-market flips already graded -- ARV, rehab, ROI, a grade, and the offer number -- each with the comparable sales you can check.
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Published by RE Flip Finder · reflipfinder.com · Last updated July 2026. Coverage, features, and pricing may change; check reflipfinder.com for current details. Estimates are for screening only and are not an appraisal or investment advice. Always verify value with a licensed appraiser and confirm rehab scope with a contractor before purchasing.