Real Estate Due Diligence Checklist for Investment Properties

Due diligence is what separates investors who get surprised after closing from those who go in with eyes open. Here's a comprehensive checklist for every investment property purchase.

Why Due Diligence Matters More for Investors

Investment property due diligence is more critical than homeowner due diligence. An unexpected $25,000 foundation problem or title defect can turn a profitable deal into a loss.

Physical Property Due Diligence

Exterior Inspection

Roof condition, age, and material
Gutters and downspouts (clear, properly attached)
Foundation visible from exterior (cracks, settling, water intrusion signs)
Grading and drainage (water should flow away from the house)
Siding or exterior cladding condition
Windows and doors (seals, operation, condition)

Interior Inspection

Basement or crawl space (moisture, mold, structural issues)
Attic (insulation, ventilation, roof deck condition, evidence of leaks)
All rooms: floors, walls, ceilings, doors, and windows
Kitchen: cabinets, counters, appliances, under-sink plumbing
Bathrooms: tiles, fixtures, ventilation
Water stains anywhere — trace back to source

Mechanical Systems

HVAC system age, type, and condition
Water heater age and condition
Electrical panel: amperage and condition
Plumbing: material, condition, water pressure
Sewer line scope (lateral line replacement can cost $5,000–$20,000+)

Environmental Due Diligence

Asbestos (likely in properties built before 1980)
Lead paint (required disclosure for pre-1978 properties)
Radon (test in areas with elevated radon risk)
Mold (look in moisture-prone areas)
Flood zone status (check FEMA flood maps)

Legal and Title Due Diligence

Title search (confirm clean title — no liens, judgments, or ownership disputes)
Outstanding mortgages or HELOCs
Tax liens or delinquent property taxes
Easements and encroachments
Zoning compliance
Outstanding permits or code violations
Unpermitted work (additions, finished basements, etc. without permits)

Financial Due Diligence

Current property tax amount and assessment
Utility costs (request 12 months of bills from seller)
Insurance quotes (get 2–3 quotes before closing, not after)
Rental income verification (leases, rent rolls, payment history)

Market Due Diligence

Verify ARV with 3–5 recent comparable sales
Check days on market for comparable renovated properties
Understand neighborhood trajectory (improving, stable, declining?)
Verify rental rates if holding as rental

What to Do With What You Find

Dealbreakers: Issues that fundamentally change the economics. Walk away or renegotiate significantly.
Price adjustments: Issues that cost money but can be fixed. Renegotiate the purchase price.
Accepted risks: Known issues you've priced into your offer. Document them and ensure they're reflected in your rehab budget.