Where Flippers Buy Houses Below Market

The median flipped home in Philadelphia sold for about 104 percent more than the flipper paid for it. Read that fast and it sounds like the easiest trade around: buy a property, hold it about ten months, sell it for roughly double.

Our deed records tell a less magical and far more useful story, and this time we measured it directly. We no longer infer what flippers paid; we read the actual purchase and resale deeds. The median Philadelphia flip was bought for $125,000 and resold for $269,450, in a postal market where the median home sold for $245,000. That gross margin was built at the purchase, not the sale. It is not a rising market doing the work, and it is not renovation alchemy on its own. It is a discount at entry plus the value the renovation added, measured before a single renovation dollar comes out.

We read the deeds for 165,054 flips across 402 postal markets, each with at least 150 detected flips in our repeat-sale corpus, and one finding survives every check we could throw at it: flippers bought below the market, and they bought below it at the moment they bought, not because the market later rose.

Flippers bought about a quarter below the market

Line up each flip's actual purchase deed against the citywide median home price and the typical flipper paid about 0.70 of the median, roughly 30 percent below. That was our first cut, and it has a flaw an auditor rightly flagged: these purchases happened between 2022 and 2025, while the citywide median we compared them against is a recent, 2025 figure. In a market that rose in between, part of that 30 percent is not a discount at all. It is just the year of appreciation between when the flipper bought and when we measured the median.

So we corrected for it, and the next section walks through exactly how. The discount held. Time-matched, the typical flipper bought at about a quarter below the market at the time of purchase, roughly 26 percent (25.5 percent as the median of the 402 market medians, 26.0 percent pooled across flips). The timing correction shaved about 4.6 points off the naive 30 percent. It did not erase the discount; it trimmed it. Flippers really do buy low. They just buy about a quarter low, not a third low, and nowhere near half. Buying at half is real only for the highest-margin slice: among the top 20 markets by gross margin the naive entry ratio was about 0.54, and time-matching lifts even that.

What a doubled price actually means

A 100 percent gross margin does not mean money doubled on renovations. It means the resale price was about twice the purchase price. Because we read both deeds, we can show what flippers actually paid and actually sold for, next to the citywide median. All figures are market-level medians; gross margin is before renovation, financing, carrying, and selling costs.

Does the timing explain the discount?

Here is the objection in full, because it is a good one. A flip's purchase deed is dated, on average, about a year before the recent window we drew the citywide median from. If the market rose in that year, comparing a 2023 purchase against a 2025 median counts a year of ordinary appreciation as if it were the flipper's discount. Strip that year out and maybe the discount is a mirage.

The obvious fix, a quarter-by-quarter price index, does not work here, and it is worth saying why. A raw median of whatever resold in each quarter is biased by which homes changed hands, and flips are exactly the homes that bias it: cheap, distressed purchases going in, renovated resales coming out. Run that naive index on Philadelphia and it reads a recent median near $140,000, when the actual citywide median is about $245,000. The index is measuring composition, not the market.

So we used a composition-robust rate instead. From the same repeat-sale corpus behind our appreciation study, we measured appreciation only from homes that sold twice at least 24 months apart, which structurally excludes flips (median hold about ten months) from setting the rate. Estimated separately for each market, those rates centered on about 5.1 percent a year nationally. We then discounted each market's recent median back to each flip's own purchase date using that market's estimated rate, and measured the purchase against that time-matched median.

The result is the headline correction: the field-wide discount goes from a naive 30.3 percent to about 26 percent, a trim of 4.6 points. Two forces keep that trim small. The holds are short, a median of about ten months, so little appreciation accrues during the flip itself; and the purchase-to-window gap is only about a year at roughly 5 percent, so only about a year of drift is ever in play. The discount is overwhelmingly realized at the purchase, not manufactured by the calendar.

The correction is small in the markets that matter most by volume, too. Here are the ten postal markets with the most detected flips, naive discount against time-matched discount:

The discount is weakest in appreciating, low-volume markets

The field median is a discount of about a quarter, but it is not universal, and time-matching is exactly where the exceptions show up. In markets with fast appreciation and thin volume, most of the apparent discount was the calendar, and once you remove it there is little left. Compare the high-volume, distress-heavy markets, which barely move, with the fast-appreciating small ones, which collapse:

Detroit is the exception: an exit premium, not just a discount

One market's margin is not mostly a purchase discount, and it is worth flagging because it is the clearest counterexample to the thesis. Detroit flips bought at a time-matched discount of about 29 percent, real but not extreme. What makes Detroit's gross margin 100 percent is the exit: renovated Detroit flips resold at about 1.44x the citywide median, because that citywide median is dragged down by distressed inventory a renovated house does not compete with. So Detroit's margin is roughly half entry discount and half exit premium. It is the market where the exit genuinely adds to the margin, and the exception that keeps the "made at purchase" thesis honest.

The margin is overwhelmingly made at purchase

Put the pieces together and the thesis holds, with two honest asterisks. Among the 402 qualifying postal markets the median gross flip margin was 36.8 percent over a median hold of 10.0 months (our national flip study has the fuller breakdown). A log decomposition of that margin attributes essentially all of the average to the entry discount: the exit-premium term averages about -0.001, and margin is negatively correlated with the entry ratio (Spearman -0.64). Buy cheaper, and the margin is bigger; the exit mostly tracks the market.

We also benchmarked each market's gross margin against what a passive hold would have returned, the market's median annual realized appreciation times the median hold, a median of about 4.4 points across the 402 markets. Subtracting it barely reorders anything, the rank correlation between raw margin and margin above the benchmark is 0.997, which is another way of saying the margin is not the market. We use "margin above the benchmark" below as a clean, appreciation-neutral version of the margin.

The two asterisks are the ones this revision added. First, market movement is not zero: time-matching showed about 4.6 points of the naive discount was appreciation between the purchase and the price window, and the roughly ten-month hold adds a little market drift on top. Second, the exit is not always neutral, as Detroit shows. Neither overturns the thesis. The margin is overwhelmingly made at purchase; it is just not made only at purchase.

Distress supply is the strongest correlate

If the market benchmark does not order the ranking, what is associated with big margins above it? The strongest correlate we found is the share of closed-sale listings written in distress language, the "as-is", "TLC", "investor special" vocabulary we cataloged in our Distress Language Index across 4,907,807 closed-sale descriptions. The rank correlation between a market's margin above the benchmark and its distress-language share is +0.71, stronger than any other variable we tested. For scale, the median market's distress-language share is 3.21 percent, and the most distress-heavy market in our scan, Camden, NJ, ran 23.27 percent.

This is a correlation, and it fits the discount story directly: markets where a large slice of sales close in distress language are markets where flippers found homes selling far below the citywide median, whether estates, code violations, or long-deferred maintenance. The purchase discount that becomes the flip margin is, on this evidence, largely a distress discount. We have not run a causal test, so we call distress supply the strongest correlate of the entry discount, not its proven cause.

Cheap markets inflate the percentages

One more correction keeps this honest. Margin above the benchmark correlates -0.51 with a market's price level. The cheapest quartile of markets posted a median of 50.5 points against 23.7 points for the priciest quartile, and 18 of the top 20 markets by margin had median home prices below $350,000. Percentage margins mechanically inflate when the denominator is small: the same dollar discount is a much bigger percentage of a cheap home.

We can put a number on it. After removing the price-level baseline statistically, Philadelphia kept about +60 points of its 100-point margin above the benchmark, meaning about 40 percent of Philadelphia's headline is cheap-market baseline, the margin any market at that price level tended to show. The other roughly 60 points are Philadelphia's own distress-and-renovation economics. Real, but smaller than the raw table suggests. Gross margins flatter cheap markets a second way, too: renovation spend is a far larger share of a $61,700 Detroit purchase than of a $420,000 Gulf Shores purchase, so the net gap between them is smaller than the gross gap.

The market we set aside

One name is deliberately missing. We excluded Bethesda, MD, because its apparent triple-digit "flip margins" are teardown and new-construction cycles, not flips, verified in the deeds as a modest sale followed 12 to 15 months later by a 2.4x to 2.9x resale of a structure whose year built equals the resale year. Excluding it left the 402 markets analyzed here.

What we measured

Flips are purchase-and-resale deed pairs with the resale closing in 2023 or later, drawn from a national repeat-sale corpus of 6,963,756 deed pairs; 165,054 of them are detected flips in the qualifying markets. A postal market qualified with at least 150 detected flips and a valid appreciation estimate; Bethesda, MD was excluded as described above, leaving 402 markets analyzed. Gross flip margin is the percentage gain from purchase price to resale price, taken as the median of individual flip margins, and it is gross: before renovation, financing, carrying, and selling costs.

The naive acquisition discount compares each market's median flip purchase against its recent citywide median home price, a 12-month window of closed sales covering houses, condos, and townhomes. The time-matched discount corrects that comparison: we discount the recent median back to each flip's purchase date using each market's composition-robust repeat-sale appreciation rate, about 5.1 percent a year, measured only from homes that sold twice at least 24 months apart so that flips (median hold about ten months) cannot inflate it, and then measure the purchase against the time-matched median. The exit ratio is the median flip resale against the citywide median. The market-appreciation benchmark used in the gross-margin analysis is the market's median annual realized appreciation times its median hold in years; margin above the benchmark is margin minus that benchmark. Distress-language shares come from 4,907,807 scanned closed-sale descriptions. Figures quoted for the whole field are medians of market medians unless a pooled figure is named. Data snapshots were taken 2026-08-14 and 2026-08-17. Everything here is realized history from closed transactions, not a forecast.

What this means if you flip

The margin is made at the purchase, and the correction only sharpened that. Even after crediting the market every point of appreciation it earned between the purchase and the price window, flippers still bought about a quarter below the market, and the biggest, highest-volume markets held that discount with room to spare. So chase acquisition channels, not appreciation forecasts: the markets that delivered were the ones where deeply discounted, often distressed purchases actually closed at scale in the deed record.

Two cautions. Read percentage margins skeptically in cheap markets, because part of a triple-digit gross margin is a small denominator, and renovation eats a bigger share of it there. And do not assume the discount travels to hot, thin markets: in fast-appreciating, low-inventory places like Gulf Shores and Fort Mill the time-matched discount nearly vanished, so the appreciation, not the purchase, was carrying the trade. Underwrite the exit like an appraiser, not an optimist, because the exit is not a constant "sell at the median"; Detroit shows it can run well above. Our guide to ARV covers how to anchor the resale side so the discount you think you bought is one you can realize.

A discount at the courthouse door, sweat in the middle, and a market that mostly watched. That, gross of renovation, is what the deeds say flipping has actually been.

Related studies

This article is part of a four-study series from the same closed-sale corpus: How Much Will My House Be Worth in 10 Years? The 3 Percent Rule Ran Well Below the Historical Median, What a Fixer-Upper Really Sells For: The 20.5% As-Is Discount, Measured in 580 Cities, and The Fixer-Upper Pipeline Map: Distress-Heavy Cities Posted 3.5x the Flip Margins.