Fix & Flip Red Flags Checklist (25 Things to Inspect Before You Sign)

Every flip that goes badly has red flags that were visible before the contract was signed. Operators either did not look for them, looked and dismissed them, or found them and convinced themselves the numbers still worked.

This is the pre-offer checklist — 25 flags pulled from DealIntel's institutional kill list, grouped so an operator can run it on a walkthrough or a desk review. Any high-severity flag on its own should trigger a renegotiation. Two should trigger a walk.

Structural red flags (the expensive ones)

• 1. Foundation cracking — horizontal or step pattern. Horizontal cracks indicate lateral pressure failure; step cracks suggest settlement. Both can run $15–80k to repair.
• 2. Sloped floors with measurable rise/fall. A 1-inch drop across 20 feet is structural. Pull a level. If the property has it, get an engineering quote before signing.
• 3. Sister-joisted basement. Someone before you saw the problem and did the cheap fix. You will be doing the expensive one.
• 4. Active water in the basement or crawl. Standing water means grading, gutter, or sump failure. Often paired with mold remediation under finishes.
• 5. Roof past 80% of useful life. Anything 18+ years on architectural shingles is a full roof, not a repair. $12–25k depending on pitch and access.

Mechanical and infrastructure red flags

• 6. Knob-and-tube or aluminum wiring. Full rewire on a 1,500 sqft home runs $12–22k and triggers permit-inspection cascades you did not budget.
• 7. Cast iron drain stack. Past 60 years it is corroding from the inside. Hydrojet inspection is $400 and tells you if you have a $14k surprise behind the kitchen wall.
• 8. Galvanized supply lines. Low water pressure throughout? Galvanized. Pinhole leaks are inevitable. Plan a repipe.
• 9. HVAC past 15 years. Furnace heat exchanger lifespans are 15–20 years. Past 15 is a coin flip on whether the inspector flags it.
• 10. Original panel under 100 amps. No buyer in 2026 closes on a finished flip with a 60-amp panel. Upgrade is $4–8k plus permit.

Legal and title red flags

• 11. Open permits on the property. Pull permit history before signing. Open permits transfer with the property and must be closed (or the addition de-permitted) before the next buyer can close.
• 12. Encroachments at the lot line. Neighbor's fence, driveway, or shed crossing the line. Quiet-title action is $3–8k and 60–120 days.
• 13. Unpaid HOA, water, or tax liens. Pull a preliminary title report before signing — not after. Liens transfer with title.
• 14. Mid-century deed restrictions. Some deed restrictions cap resale terms, prohibit subdivision, or restrict ADU construction. Read the title commitment.
• 15. Recent code-enforcement actions. A property with a fresh stop-work order or notice of violation is telling you something about either the prior owner or the jurisdiction's enforcement appetite.

Market and exit red flags

• 16. Days-on-market trend rising in the submarket. If DOM has climbed from 18 to 45 over the last 6 months, your 90-day exit assumption is no longer realistic. Re-underwrite at 120.
• 17. Comp set thinning. Fewer than 3 renovated comps within 0.5 miles and 90 days means your ARV is a guess. See why ARV fails.
• 18. School district downgrade. School ratings move buyer pools. A district that lost a point in the last cycle takes 6–12 months to show up in comps.
• 19. Major employer announcement in the metro. A 5,000-job loss announcement does not show up in comps for 9–12 months. It shows up in DOM in 2.
• 20. Submarket overrun with flipper inventory. If three other flips are listed within 4 blocks at similar finish levels, the buyer pool will not absorb all of them at full price.

Financing and capital red flags

• 21. Carry cost >30% of projected profit. Hard money interest, taxes, insurance, utilities — when these eat one-third of the profit before any execution risk, the deal is too thin. See the true cost of hard money.
• 22. No cash reserve for the rehab contingency. 15% contingency on a $90k rehab is $13.5k of cash you need available. If you are running tight on liquidity, you cannot afford the surprise.
• 23. Personally-guaranteed acquisition with no exit financing in place. If your only takeout plan is "sell it fast," and the market turns, the bank gets the house and you get the deficiency.
• 24. Refinance gate not modeled. On a BRRRR, DSCR underwriters require 1.0–1.25 DSCR on the refi. If projected rent does not support the takeout payment, the capital does not come out. Model it before you buy.
• 25. Lender-required appraisal not yet ordered. Your number is your number until the appraiser puts a different one on it. Order the appraisal early.

How to use the checklist

Run it on every property within 24 hours of seeing the listing. Any high-severity flag — particularly in the structural, mechanical, or legal categories — should trigger a written renegotiation request, an engineering quote, or a walk. Two simultaneous flags in the high-severity categories should be an automatic walk. The deal is telling you something about either the seller's information or the property's history.

DealIntel runs all 25 checks automatically on every evaluated property, with severity scoring and a recommended verdict. The platform was built on the observation that knowing when not to invest is the most valuable number on the page.

Related reading

• 10 deal killers every fix and flip investor should walk away from
• Foundation problems that kill profit
• Permit risks every investor misses
• How to analyze a fix and flip deal