10 Deal Killers Every Fix and Flip Investor Should Walk Away From

A fix & flip deal that looks great on the spreadsheet can still be a guaranteed loss. The headline numbers — ARV, profit, ROI — assume nothing in the underlying transaction breaks. Most actual fix & flip losses come from a single high-severity risk that the underwrite never priced, because the underwriter never checked for it.

These are the ten that, on their own, justify walking away.

1. Thin or incomparable comp set

Under three high-parity comps within 0.5 miles and 90 days. Or a per-sqft range wider than 20% across the comps that exist. ARV in this state is a guess, and every projected number downstream inherits that uncertainty. Walk away or wait for more closings.

2. Title issues that survive escrow

Unreleased liens, easements that block the planned renovation footprint, unresolved probate, or a title insurance carve-out for a known defect. A title issue does not get cheaper after closing; it gets more expensive.

3. Unpermitted square footage in the comp set

Subject reports 1,800 sqft per the assessor. The MLS says 2,200 sqft. The difference is unpermitted additions. Lenders refinance at the lower number, buyers' appraisers cut at the lower number, and the operator owns the gap.

4. Zoning incompatible with planned strategy

ADU strategy on a lot that does not allow ADUs under current municipal code. Multi-unit conversion on a parcel zoned R1. Ground-up where setbacks consume more than 40% of buildable area. Check the zoning before signing — not during.

5. Foundation or structural integrity unknowns

A property with visible foundation cracks, sloped floors, or a known geology issue (expansive soil, fill, near-fault) that has not been engineered out. Foundation work is the single largest source of rehab budget overrun in residential.

6. Market liquidity below 90 days median days-on-market

Hot markets close fast — under 30 days median DOM. Marginal markets are 30–90. Anything beyond 90 means the exit is slow, carrying cost compounds, and the operator is months further from capital recycling than the spreadsheet says.

7. Hard-money carrying cost greater than 30% of projected profit

A common failure mode in long-rehab fix & flips. If the interest and origination across the projected hold consume more than 30% of projected gross profit, a single month of slippage moves the deal from "tight" to "loss." The deal needs more spread or a cheaper capital stack to survive.

8. DSCR below 1.10 at projected rents

On a BRRRR path, the DSCR refinance is the unlock that recycles capital. DSCR below 1.10 at the underwritten rent assumption leaves no buffer for vacancy, rent miss, or a +100 bps rate move. A rate shock at refinance can drop DSCR under 1.0 and break the refinance entirely. Walk away or restructure the rent assumption.

9. Environmental contamination near the parcel

Former gas station, dry cleaner, industrial use within groundwater path, or a known EPA-tracked plume in the neighborhood. Disclosure on resale becomes legally complex and buyer pools shrink materially.

10. Single-buyer exit dependency

Properties priced for a very specific buyer profile (e.g., $3M+ view-dependent custom in a 30-day-DOM mid-market neighborhood). If only one type of buyer wants this property at the projected ARV, the exit is fragile. Most exits should clear at least three plausible buyer profiles.

How DealIntel runs this on every deal

The list above is the highest-severity ten from DealIntel's 25-point Kill List. Every deal evaluated on the platform is screened across all 25 — structural, market, financing, legal, and exit risk — before strategy and pricing work begins. A single critical flag triggers a Pass verdict or a "Review Terms" flag for the user to manually clear.

The Kill List is not a substitute for due diligence. It is the institutional filter that ensures due diligence is even worth doing — because deals that fail the Kill List are deals that rarely survive contract anyway.

See how DealIntel evaluates a deal or read more in the FAQ.