A profitable fix-and-flip decision starts before the offer. This reusable 30-point due diligence checklist helps you test the property, the numbers, the neighborhood, and your execution plan before committing capital.
Overview
Due diligence is not simply a property inspection. It is the process of finding out whether the proposed purchase, renovation, financing, and resale plan can work together. A house may look inexpensive but still be a poor flip if the title is unclear, the neighborhood has weak buyer demand, the renovation requires unconfirmed permits, or the projected resale price depends on unusually optimistic comparable sales.
Use the checklist below in stages. Mark each item as verified, needs documentation, needs professional review, or unknown. Unknown items should not be silently treated as favorable assumptions. Record the source, date, and person who supplied each important answer so you can revisit the worksheet as new information arrives.
For the financial model, include acquisition costs, renovation costs, financing, utilities, insurance, taxes, maintenance, selling expenses, and holding costs. A house flipping calculator can help organize these inputs, while a room-by-room renovation budget and scope of work can expose missing line items. Treat the projected profit as an estimate, not a guarantee.
Checklist by scenario
Property, title, and legal checks
- Confirm the legal owner. Compare the seller’s identity with the recorded ownership information.
- Order or review a title search. Look for liens, judgments, unpaid obligations, easements, restrictions, and other matters that could affect the transaction.
- Check the legal description. Confirm that the address, parcel, lot, and included improvements match the contract and marketing information.
- Ask about open permits. Request permit history and determine whether prior work was completed, inspected, and closed.
- Verify zoning and use. Confirm that the current use and intended renovation comply with local zoning, setbacks, density, and occupancy rules.
- Identify code or violation notices. Ask the local authority and seller about unresolved notices, unsafe conditions, or required corrective work.
- Confirm any historic, environmental, or neighborhood restrictions. These may affect exterior changes, demolition, additions, parking, or materials.
Physical condition and renovation risk
- Inspect the foundation and structure. Look for movement, major cracking, water intrusion, uneven floors, damaged framing, or signs that require a structural specialist.
- Check the roof and drainage. Review age, visible damage, flashing, gutters, downspouts, grading, and evidence of recurring leaks.
- Test major systems. Evaluate electrical service, plumbing supply and drainage, HVAC, water heating, and visible gas connections.
- Inspect the building envelope. Review siding, masonry, windows, doors, insulation indicators, and areas where moisture may enter.
- Look for hazardous materials or conditions. Potential asbestos, lead-based paint, mold, underground tanks, contaminated soil, or other hazards may require specialist testing and regulated handling.
- Map the renovation scope. Separate cosmetic work from repairs that can expand after demolition. Record quantities, not just broad labels such as “update kitchen.”
- Confirm utility status. Determine whether water, sewer, electricity, gas, and internet services are active, separately metered, shared, or subject to unusual connection requirements.
- Assess access and staging. Check driveways, alleys, stairs, parking, material delivery routes, debris removal, working hours, and neighbor constraints.
Market and resale checks
- Pull comparable sales. Use nearby, recent, genuinely comparable properties and adjust for size, layout, condition, lot, location, and finish level. See the guide to comparative market analysis for flippers for a more disciplined process.
- Test the after-repair value. Build a conservative, base, and optimistic ARV scenario rather than relying on one attractive sale.
- Study active and pending listings. These show your future competition and may reveal whether renovated homes are sitting, reducing prices, or selling quickly.
- Identify the likely buyer. Consider household size, commute patterns, school preferences where relevant, parking needs, accessibility, storage, and preferred bedroom and bathroom counts.
- Check resale constraints. Confirm whether the property has unusual layout issues, shared access, flood or insurance concerns, limited parking, or features that narrow the buyer pool.
- Compare the planned finish level with the block. The best renovations for resale usually fit local expectations without creating an over-improved house that nearby sales cannot support.
Financial, insurance, and execution checks
- Price the renovation independently. Obtain detailed contractor input or use a rehab cost estimator, then add a contingency appropriate to the uncertainty and project complexity.
- Verify contractor availability. Ask who can start, how long the work may take, whether required licenses and insurance are in place, and which trades are included.
- Model the flip timeline. Include closing, design, approvals, demolition, construction, inspections, punch work, listing, contract, and closing periods.
- Calculate holding costs. Include loan interest, taxes, insurance, utilities, security, lawn or snow care, maintenance, and any association charges for the expected hold period. Use the monthly holding-cost checklist to avoid overlooking recurring expenses.
- Confirm financing assumptions. Check draw rules, interest calculation, fees, reserves, extension terms, and whether the lender accepts the planned scope and property condition.
- Obtain an insurance indication. Confirm that suitable coverage is available during construction and that vacant, older, or unusual properties do not create an unexpected constraint.
- Estimate selling costs and taxes. Include agent compensation where applicable, seller-paid concessions, transfer charges, legal costs, staging, cleanup, and tax treatment. Discuss tax questions with a qualified professional; the article on tax considerations for a house flip can help organize questions.
- Run the downside case. Test a lower resale price, higher renovation cost, and longer timeline. Decide in advance what margin, reserve, or return threshold makes the deal unacceptable.
- Write a pass rule. If title, structural risk, permitting, insurance, financing, or resale demand cannot be verified within the due diligence period, pause or withdraw rather than filling the gap with optimism.
What to double-check
Some answers sound reassuring but are not evidence. “The roof is fine” should become a roof inspection, visible condition notes, and an allowance if age or access is uncertain. “The renovation does not need permits” should be confirmed with the relevant local authority, especially for structural, electrical, plumbing, HVAC, roof, or layout changes. Permit practices vary by jurisdiction, so use local confirmation rather than a general online assumption; the permit requirements guide can serve as a question list.
Double-check every comparable sale for condition and finish quality. A fully renovated property is not automatically comparable to a dated property with a similar square-foot figure. Also verify measurements, bedroom and bathroom counts, basement treatment, parking, lot characteristics, and whether the sale included unusual concessions.
Ask the seller or agent:
- How long has the property been vacant, and why?
- What repairs, leaks, insurance claims, or water events are known?
- What work was completed, by whom, and when?
- Are there invoices, warranties, permits, surveys, inspection reports, or violation notices?
- Are any utilities shared, disconnected, or billed through another property?
- Are there disputes, tenants, occupants, access agreements, or personal property that affect possession?
- What facts would a buyer’s lender or insurer likely question?
Reconcile the answers with documents, inspections, public records, and your own site visit. A disagreement is not always a deal breaker, but it is a reason to investigate before making an offer or removing contingencies.
Common mistakes
- Starting with finishes instead of risk. Cabinet colors and flooring matter less than foundation movement, title defects, water intrusion, or an unworkable layout.
- Using a single ARV. A precise-looking resale number can conceal weak comps. Use ranges and explain the assumptions behind each scenario.
- Underestimating small costs. Dumpsters, temporary utilities, permits, engineering, cleaning, security, landscaping, touch-ups, and final inspections can accumulate.
- Ignoring the calendar. Delays may increase holding costs and push the sale into a different seasonal or competitive environment.
- Assuming contractor access. A property that cannot receive materials efficiently or support safe staging may cost more and take longer.
- Over-improving for the neighborhood. Compare the planned scope with buyer expectations and nearby renovated sales. Kitchen and bathroom decisions should support the market position, not merely personal taste.
- Failing to define a walk-away point. A deal becomes harder to evaluate once time, inspection fees, or emotional attachment begin influencing the decision.
When to revisit
Use this checklist before submitting an offer, during the inspection or due diligence period, before releasing contingencies, and immediately before closing. Re-run the analysis whenever a contractor changes the scope, a permit official identifies additional work, financing terms change, an inspection reveals a major issue, or a comparable sale materially changes your ARV assumption.
It is also worth reviewing your checklist before each new flipping season and whenever your tools, lender requirements, local rules, insurance availability, or contractor network changes. Keep a dated version for every property. At minimum, update the purchase price, scope, renovation estimate, contingency, timeline, financing, holding costs, selling costs, ARV range, and pass rule.
Your final pre-offer decision should be simple: proceed only when the major risks are documented, the numbers work under a reasonable downside case, and you have a credible plan to complete and sell the renovation. If one of those conditions remains unknown, price the uncertainty conservatively—or pass.
