Real estate due diligence is the investigation you run between signing a purchase contract and the deadline when your right to walk away expires: title and liens, physical condition, permits and code history, zoning, flood risk, leases, taxes and insurance. For a 1-4 unit or small investment property, it fits inside a typical 10-21 day window if you start the slow items on day one and treat the deadline as the only date that really matters.
Below is the full checklist, a day-by-day timeline, how three state forms handle the “free look” period, the version a wholesaler should run before assigning, and where new investors lose money. Most due diligence failures are not about missing a defect. They are about running out of time before you notice it.
What the due diligence window actually protects
Your contract creates the window, not a statute. Depending on the form, it is called a due diligence period, an option period, or an inspection contingency. During it, you can usually terminate and recover your earnest money if you follow the notice rules. After it, your deposit is typically at risk and you are buying what you found, plus whatever you missed.
So organize the work by lead time. Some checks take ten minutes online. Others, like a title commitment, a survey or tenant estoppels, depend on third parties who do not care about your deadline. Our breakdown of the inspection contingency covers the notice mechanics in more depth.
The real estate due diligence checklist, item by item
Title, liens and ownership
Open title with a title company or closing attorney the day the contract is signed. The commitment should show the vested owner, open mortgages, judgments, tax liens, mechanic’s liens, municipal liens (water, sewer, code fines), easements and pending lawsuits. Confirm the person who signed your contract is the owner, or that every owner and heir has signed. Estates, divorces and properties titled to a deceased relative are where deals stall.
You can run a preliminary check at the county recorder first; our guide on how to do a title search shows what to pull, and title insurance for investors explains why an owner’s policy matters even on a cheap property. A recorded lis pendens signals litigation that can follow the property to you.
Survey and boundaries
On many single-family deals, investors rely on an existing survey or plat. Order a new boundary survey when fence lines look wrong, there is a shared driveway or an outbuilding near the line, or you plan to add a unit or split the lot. Surveys are often the longest lead-time item, so get a quote and turnaround on day one even if you have not decided you need one.
Physical inspection
A general inspection covers roof, structure, electrical, plumbing, HVAC and visible water intrusion. Add specialists where the building calls for it: a sewer scope on older homes, a structural engineer for foundation cracks or sloping floors, a wood-destroying insect report where termites are common. Turn every finding into a budget line and rerun your numbers; our guide on how to estimate repair costs shows how to price what the inspector writes up.
Permits and code violations
Request the permit history from the building department and ask code enforcement for open cases. You are looking for open or expired permits, unpermitted conversions (a garage turned bedroom, a basement unit) and active violations with running fines, which in many cities can become liens. An unpermitted second unit is not a bonus unit; it can be an order to remove it. The same records that make code violation leads useful for marketing can sink your exit on your own deal.
Zoning and permitted use
Check the zoning map and confirm the current use is legal: number of units, short-term rental rules, and whether the property is legally nonconforming. Nonconforming status can be lost in some places if the use stops for a set period or the building is heavily damaged, so ask the planning office before you plan a long renovation vacancy. Pull the certificate of occupancy and permit history at the same time, so you know how many units are legal before you price the deal.
Flood zone
Look the address up on the FEMA Flood Map Service Center. Zones beginning with A or V are Special Flood Hazard Areas, mapped for the 1% annual chance flood. If the building sits even partly in one and your loan comes from a federally regulated lender, the lender must require flood insurance under the Flood Disaster Protection Act of 1973, as Pima County’s FEMA zone summary explains. Get a real flood quote during the window; the premium can move a rental’s cash flow more than any repair. Zone X means lower mapped risk, not no risk.
Environmental basics
For a house or small rental, environmental diligence usually means checking for a buried oil tank, asbestos, mold, radon where common, and risky neighbors like a former gas station. A formal Phase I Environmental Site Assessment is mainly a commercial and land tool. EPA’s All Appropriate Inquiries rule at 40 CFR Part 312 recognizes the ASTM E1527-21 standard, effective February 13, 2023, per Beveridge & Diamond’s summary of the final rule, and completing that inquiry before you acquire is a key element of the federal CERCLA landowner liability defenses. Buying land with past industrial use, or a lender asks? Budget for a Phase I.
Lead-based paint disclosure for pre-1978 homes
Under the federal Lead-Based Paint Disclosure Rule, sellers and landlords of most pre-1978 housing must disclose known lead hazards, provide available reports and the EPA pamphlet, and include a Lead Warning Statement before the contract or lease is signed. Buyers get a 10-day opportunity to test, which HUD notes can be lengthened, shortened or waived in writing; sellers and lessors must keep disclosures for at least three years. Check the disclosure is attached to your contract, and remember you inherit the duty when you resell or rent.
HOA or condo association
Get the governing documents, budget, recent minutes, and the unit’s dues and assessment status. Rental caps, minimum lease terms and a pending special assessment can each kill an investor’s plan. Ask how long the association takes to issue its closing status letter.
Leases, estoppels and the rent roll
For an occupied rental, the seller’s rent roll is a claim, not a fact. Ask for every lease and amendment, the deposit ledger, 12 months of payment history and any eviction filings, then signed tenant estoppel certificates confirming rent, deposit, term and side deals. Compare lease, ledger and estoppel; mismatches are where you find the tenant who “pays $1,100” but has not paid since spring. Our guide to buying a tenant-occupied property covers access and what you inherit.
Property taxes and reassessment
Do not underwrite with the seller’s tax bill. Owners often carry homestead or senior exemptions you will not get, and some states reassess on sale. In California, a change in ownership triggers a supplemental assessment based on current market value, billed directly to the owner rather than the lender. Check how your county handles sales and look for delinquent taxes in the title report.
Insurance, utilities, septic and well
Get a written landlord or vacant-property insurance quote before the deadline; roof age, wiring, prior claims and vacancy can make a property costly or hard to insure, and a quote you cannot get is a finding. Confirm public water and sewer versus well and septic. For septic, order an inspection and pull the health department permit, which shows the bedroom count the system was approved for. For a well, test quality and flow. Ask utilities about unpaid balances, since in some places they attach to the property.
A day-by-day timeline for a 14-day period
This is a typical sequence, not a legal requirement. Your contract’s dates control, so count them exactly as it does (calendar or business days, and any time-of-day cutoff).
| Day (typical) | What to do | Why then |
|---|---|---|
| Day 0-1 | Deliver deposit or fee on time; open title; request insurance, flood and survey quotes; book inspector | Late deposits can cost the termination right; title and surveys are slowest |
| Day 1-2 | Online checks: flood map, zoning, tax record; request permit and code history | Cheap, and a hard fail saves inspection fees |
| Day 2-5 | General inspection; request leases, ledger, estoppels, HOA documents | Specialists needed are known only after the general inspection |
| Day 5-8 | Specialist inspections (sewer, structural, septic, well, lead) | Leaves time for reports |
| Day 8-10 | Review title commitment; update repairs; rerun numbers; get bids | Full picture before negotiating |
| Day 10-12 | Send written repair or price request; schedule end buyer’s walkthrough | Seller needs time to answer |
| Day 12-13 | Decide: proceed, renegotiate or terminate; sign any amendment | A verbal extension is not an extension |
| Day 14 | Deliver termination notice, if terminating, by the required method and time | Missing by an hour can cost the deposit |
On a 10-day window, book specialists in advance to compress days 2-8. On a 21-day window, you have room for bids and a survey, but do not let the extra time make you start late.
How the “free look” works in three state forms
Standard forms differ a lot between states. Here are three, checked against the forms or regulator guidance. If you use your own investor contract, your contract’s terms govern instead.
| State and form | What the buyer pays | Termination right | If buyer terminates in time |
|---|---|---|---|
| North Carolina, Offer to Purchase and Contract (Form 2-T) | Negotiated due diligence fee paid to the seller, plus earnest money | Any or no reason, in writing, until the period ends | Earnest money typically returned; seller generally keeps the fee |
| Georgia, GAR purchase and sale agreement | Earnest money | Period works as an option to terminate for any or no reason by written notice | No notice before it ends: buyer is bound and buys “as is” |
| Texas, TREC Resale Contract (Form 20-19) | Option fee and earnest money to escrow within 3 days of the effective date | Unrestricted right to terminate in the option period, by 5:00 p.m. local time | Earnest money refunded; option fee kept by seller, credited to price if you close |
North Carolina’s due diligence fee
The NC Real Estate Commission’s due diligence Q&A confirms the buyer can terminate for any or no reason during the period, the fee is generally non-refundable, and earnest money typically comes back. Its fee delivery bulletin adds that the fee goes to the seller, is credited to the buyer at closing, and is refundable on a material seller breach. NC REALTORS’ 2026 revisions give the buyer until the end of the next banking day after the effective date to pay before being in breach, and let the seller restrict physical access until paid. For a wholesaler, that fee is money at risk the moment you sign.
Georgia and Texas
Georgia practitioners describe the GAR due diligence period as an option: withdraw for any or no reason by written notice, or be treated as having exercised it. Repair requests usually go through an amendment the seller can accept or reject. In Texas, TREC’s Form 20-19 says that if no option fee is stated or it arrives late, the buyer does not get the unrestricted termination right, and time is of the essence. For other states, see our state wholesaling guides.
The wholesaler’s version: verify before you assign
A wholesaler does not need a full inspection on every contract, but you need enough diligence that your end buyer’s review does not blow up the deal. Your assignment fee only gets paid at closing.
- Who must sign. Every owner of record, heirs, and spouses where required. A missing signature kills more assigned deals than anything else.
- Liens versus price. Payoffs, tax liens, judgments and municipal liens must fit under your price. If the seller owes more than you are paying, it is a short sale, not a wholesale.
- Assignability. Confirm the contract allows assignment and the title company will close it; an investor-friendly title company saves days.
- Access. Write walkthrough access for your buyer and their contractor into the contract.
- Defensible numbers. Buyers recheck ARV and repairs. Run comps with the ARV calculator and the full deal in the fix-and-flip calculator before you quote a price.
- What the buyer will find. Flood zone, open code cases, unpermitted units, septic problems, tenants who will not leave. Disclose what you know.
- Their time inside your window. With 10 days, find the buyer by day 5 or negotiate a longer period up front.
Hypothetical worked example
HYPOTHETICAL figures. A wholesaler contracts a 1962 duplex at $140,000 with a 14-day window. The end buyer will pay up to $160,000, leaving a $20,000 spread. On day 2, the permit search shows the rear unit is an unpermitted garage conversion. On day 6, title shows a $3,800 municipal lien. On day 9, the buyer’s contractor prices legalizing the unit at $18,000, so the buyer’s ceiling drops to $142,000 and the spread nearly vanishes.
On day 10, the wholesaler takes the permit record and bid to the seller, renegotiates to $128,000, and has the lien paid from the seller’s proceeds, restoring a $14,000 spread. Without the day-2 search, the wholesaler would have learned this on day 13 from an angry buyer, with no time left to renegotiate.
Where beginners lose money in due diligence
- Starting late. Title and surveys ordered on day 7 come back after the deadline.
- Missing notice rules. A text is not written notice if the contract requires a specific method, and many deadlines have a time-of-day cutoff.
- Treating a fee like a deposit. NC due diligence fees and Texas option fees are generally kept by the seller if you walk.
- Trusting the rent roll. Without leases, ledgers and estoppels, you may be buying a non-paying tenant. See cash for keys if you inherit one.
- Using the seller’s taxes and insurance. Exemptions disappear and premiums can jump.
- Counting unpermitted units as income. If the unit cannot be legalized, the income is not real.
- Waiving the window to win. A short or waived period can win the contract and lose the investment. If you waive, inspect before you sign.
Walk away when title cannot be cleared before your deadline, when the numbers only work with income the property cannot legally produce, or when the seller will not provide access or documents. If you want a second set of eyes on early contracts, Victoria’s mentorship program works through due diligence checklists on students’ own deals.
Due diligence questions investors ask
How long is a typical due diligence period?
For residential investment deals, 10-21 days is common, but it is negotiated, not set by law. Longer periods suit rentals with tenants, septic systems or surveys.
Do I get my earnest money back if I cancel?
Usually, if you terminate within the period and follow the notice rules, but your contract decides. Separate fees like NC’s due diligence fee or Texas’s option fee are generally not refunded. See our guide to earnest money for wholesalers.
Do I need a Phase I on a house?
Rarely. Phase I reports are standard for commercial, industrial and land deals. On a house, focus on oil tanks, asbestos, mold, radon and lead unless prior use or a lender calls for more.
Can I extend the period?
Only if the seller agrees, in a signed written amendment before the original deadline. Sellers often ask for more nonrefundable money in exchange.
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