Due diligence isn't just a checklist. It's how you avoid buying someone else's problem. Here's every item I check before I put money down.
Why Due Diligence Determines Your Profit
By the time most investors get to due diligence, they're emotionally committed. The numbers look good, the seller is motivated, the deal feels right. That's exactly when you need to slow down.
Due diligence is your chance to either confirm the deal or find out why it's actually a disaster. There's no shame in walking away -- there's real shame in closing on a nightmare you could have seen coming.
Section 1: Title and Legal
Title search: Hire a title company or real estate attorney to search the chain of title going back at least 40 years. You're looking for gaps in ownership, forged deeds, and clouded title from estates or divorces.
Outstanding liens: Mortgage liens (from current or previous owners), mechanic's liens (unpaid contractors), judgment liens (court-ordered debt), and IRS tax liens all attach to the property -- not just the owner. You inherit them if you close without addressing them.
HOA liens: If the property is in an HOA, check for unpaid dues. HOAs have powerful lien rights in many states.
Easements and restrictions: Check for utility easements, drainage easements, conservation restrictions, and deed covenants that limit what you can do with the property.
Encroachments: A survey can reveal that a neighbor's fence or structure crosses your property line. That's their problem to fix -- or it becomes yours if you don't catch it.
Section 2: Financial Records
Utility bills: Request 12-24 months of utility bills. Unusually high bills can signal HVAC problems, poor insulation, or water leaks.
Rental income records: For income properties, request rent rolls, leases, and bank statements showing actual deposits. Sellers sometimes inflate occupancy or rent amounts.
HOA financials: Request the HOA's budget, reserve fund balance, and meeting minutes for the last 12-24 months. A severely underfunded reserve means special assessments are coming -- and you'll pay them.
Insurance claims history: Run a CLUE report (Comprehensive Loss Underwriting Exchange) to see prior insurance claims. Multiple claims for water damage or fire are major red flags.
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Section 3: Permits and Code Compliance
This is where most investors cut corners -- and where the expensive surprises hide.
Open permits: Search your county or city's building permit database for open or expired permits. An open permit means work was started but never inspected. You inherit the obligation to complete it.
Unpermitted additions: That finished basement, the added bedroom, the converted garage -- were they permitted? If not, the county can order you to bring them up to code or tear them out.
Zoning verification: Confirm the property's current use matches its zoning. An investor who bought a "4-unit" building that was only zoned for 2 units lost 50% of their income stream overnight when the city found out.
Certificate of occupancy: Verify a CO exists for the current use. Some properties have been converted without one.
Section 4: Physical Inspection
Foundation: Cracks, settling, bowing walls. The most expensive single problem in residential real estate. Foundation repairs can run $15,000-$80,000 depending on severity.
Roof: Age, condition, signs of active leaks or water intrusion. Get roof estimates if it's near end of life (15-20 years for asphalt shingle).
HVAC: Age, maintenance records, operating condition. A 20-year-old system that hasn't been serviced is a $5,000-$12,000 replacement waiting to happen.
Plumbing: Check for cast iron drain pipes (common in pre-1960 homes) that need replacement, water pressure, signs of leaks or previous repairs under sinks.
Electrical: Aluminum wiring (common 1965-1973), Federal Pacific or Zinsco panels, and double-tapped breakers are all insurance and safety issues.
Basement/crawl space: Water intrusion, mold, structural issues. A flooded basement is one of the top reasons I walk away from deals.
Pest inspection: Termites, wood-boring beetles, and rodent infestations. Separate from your general inspection in most markets.
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Section 5: Environmental Issues
Environmental problems can make a property unsellable and cost more to remediate than the property is worth.
Lead paint: Required disclosure in homes built before 1978. If you're renovating, you need certified contractors and specific disposal procedures.
Asbestos: Common in popcorn ceilings, floor tiles, insulation, and siding on pre-1980 homes. Testing before renovation is essential.
Underground storage tanks (USTs): Former gas stations, auto repair shops, or agricultural properties may have buried tanks. Tank removal and soil remediation can run $20,000-$100,000+.
Flooding: Check FEMA flood maps and the property's flood zone designation. Flood insurance can add $1,500-$4,000/year to your carrying costs. Always ask sellers if the property has ever flooded.
Mold: Visible mold or musty odors require professional testing. Remediation costs vary widely but $5,000-$20,000 is typical for significant mold issues.
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Section 6: HOA and Community Rules
If the property is in an HOA, the rules can dramatically affect your investment strategy.
CC&Rs (Covenants, Conditions, and Restrictions): Read these. Some HOAs prohibit rentals, short-term rentals, or certain types of renovations.
HOA financials: Already mentioned above, but worth repeating. Check the reserve fund. Ask if any special assessments have been approved or are being discussed.
Pending litigation: Ask if the HOA is in any active lawsuits. This affects your ability to get a mortgage and your future resale.
Rental caps: Some HOAs limit what percentage of units can be rented. If you're at the cap, you can't rent your unit.
Build Your Numbers as You Discover Issues
As you work through due diligence, issues will surface. Each one needs a dollar value attached. Don't just note "needs new roof" -- get a quote. $8,500 for a new roof changes your offer differently than $22,000.
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Analyze Any Property Before You Commit
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FAQ
How long should due diligence take on a residential property?
Standard inspection periods run 7-21 days. For a simple single-family flip, 7-10 days is often enough if you move fast. For multi-family or commercial, 21-30 days is more appropriate. Always use every day available -- never waive your inspection period.
What's the difference between due diligence and the inspection period?
They're often used interchangeably, but due diligence is broader. The inspection period specifically refers to your right to hire inspectors and get reports. Due diligence includes everything -- title, financials, zoning, permits, physical condition, and legal review.
Can I get a refund of my earnest money if I find problems during due diligence?
It depends on your contract. Most well-written purchase agreements include an inspection contingency that lets you exit for any reason (or for specific reasons) and recover your earnest money during the inspection period. See how earnest money deposits work.
Do wholesalers need to do full due diligence?
Yes, more than most. You're assigning the contract to a buyer who will rely on the information you have. Undisclosed material issues can expose you to legal liability. At minimum, do a permit pull, basic lien check, and thorough walkthrough before assigning.
What if I find major issues after closing?
Your options depend on what was disclosed and what your contract says. If the seller knew about a defect and didn't disclose it, you may have a fraud or misrepresentation claim. Title insurance covers title defects. For physical issues the seller didn't know about, you're typically on your own -- which is why due diligence before closing is so important.