Flip Hold Times Just Hit 165 Days — Here's What a Longer Timeline Actually Costs You

What just happened

ATTOM's Q1 2026 U.S. Home Flipping Report shows the median time from purchase to resale stretched to 165 days, up from 160 days the previous quarter — the slowest pace in this data series in some time. That's happening alongside two other trends pointing the same direction: the 30-year fixed mortgage rate climbed to 6.95% as of September 17, its highest level since January 2025 and up from 6.71% just two weeks earlier, and national existing-home inventory sits at 4.9 months' supply, the highest level in more than a decade.

The headline: it's not just your project running long. Homes generally are taking longer to sell nationally, financing costs are climbing again, and the two trends compound each other.

What it means for flippers

Five extra days on paper doesn't sound like much, but 165 days is closer to 5.5 months than the 4-month timeline a lot of flippers still underwrite by default. Every one of those weeks carries real cost on a financed deal, and a slower national resale market means your own project is more likely to land on the long side of that average, not the short side.

• Budget the carrying cost explicitly: on a $250,000 hard-money balance around a 10% rate, each extra month adds roughly $2,080 in interest alone — before insurance, taxes, utilities, and HOA dues.
• Underwrite 5.5–6 months as the base case, not 3–4. If your project finishes faster, that's upside; if you budget for fast and it doesn't happen, that's the margin disappearing.
• Re-quote financing at today's rate before you close. A loan estimate from a few weeks ago may already be stale with the 30-year benchmark at 6.95%.
• Price the exit for a slower buyer pool. With 4.9 months' national supply — the most in over a decade — buyers have more options and less urgency, so a finished flip priced to last year's speed can sit and bleed carrying costs.

The takeaway

Longer hold times and higher rates are showing up together, and they multiply each other's cost. The flippers protecting their margin right now are the ones building a 5.5–6 month timeline and its full carrying cost into the 70% rule math before they make an offer — not the ones hoping this cycle moves as fast as the last one did.