The due diligence documents for a real estate purchase fall into five groups: records that prove ownership and title, disclosures the seller is required to give you, reports on the property’s physical condition, financial statements for income-producing properties, and documents that establish legal, regulatory, and tax compliance. You review them during a defined contingency window written into the purchase contract, and what you find in that window determines whether you close, renegotiate, or walk away with your earnest money intact.
Miss something important and you can inherit another owner’s debts, contamination, or unpermitted work. The sections below cover what each document shows, why it matters, and where buyers commonly get burned.
Ownership and Title Documents
Before anything else, confirm who legally owns the property and what claims attach to it.
The Deed
A deed is the written instrument that transfers ownership from seller to buyer, recorded with the local county clerk’s office to create a public record of the transfer.1Legal Information Institute. Deed The type of deed you receive controls your recourse if a title problem surfaces later. A general warranty deed is the strongest: the seller promises clear title and agrees to defend against any claims, including those predating the seller’s ownership. A special warranty deed covers only defects that arose during the seller’s time holding the property. A quitclaim deed makes no guarantees and simply conveys whatever interest the seller may have, which may be nothing.
Title Search and Title Report
A title search traces the property’s ownership history through public records and produces a report showing the current legal owner and any liens, easements, judgments, or other claims. This is where you discover that a seller’s ex-spouse still holds an interest, or that an unpaid contractor filed a mechanic’s lien after a renovation three years ago. Tax liens, mortgage liens, mechanic’s liens, and court judgments all appear if properly recorded. A clean title report is almost always a condition of closing, and lenders won’t fund a mortgage without one.
Title Insurance
Title insurance covers hidden problems a search can miss. A lender’s policy protects the lender up to the loan amount and is almost always required. An owner’s policy is optional, protects your equity, and typically lasts as long as you or your heirs own the property.
Coverage is not unlimited. Standard exceptions commonly exclude taxes assessed after your purchase, boundary disputes a survey would reveal, unpaid contractor liens, mineral rights, and adverse possession claims. Special exceptions reflect issues specific to your property, such as recorded easements or HOA declarations.2First American. What Is Not Covered by Title Insurance Read the exceptions. Buyers sometimes assume title insurance is a blanket guarantee, and it isn’t.
Property Survey
A survey defines the exact boundaries of the land and flags encroachments, easements, and setback violations. It ties to the legal description that appears in the deed. When the survey doesn’t match the legal description, or reveals that a neighbor’s fence sits two feet onto your side, you have a negotiation point before closing rather than a dispute after it.
Seller Disclosures
State and federal law require sellers to turn over certain information. Reviewing these documents sits alongside your independent inspections, not in place of them.
Seller Disclosure Statement
Most states require the seller to complete a standardized form listing known material defects that could affect value. Typical categories include structural issues, water damage, roof condition, pest infestations, HVAC problems, plumbing and electrical defects, environmental hazards, land-use restrictions, HOA obligations, and whether deaths have occurred on the property. The depth varies by state. Some require line-by-line responses, others allow general statements, and a few have minimal or no mandatory disclosure at all.
Sellers must disclose what they know. They aren’t required to go looking for problems they haven’t noticed. A seller who genuinely didn’t know about a cracked foundation has different legal exposure than one who painted over the evidence. That gap is exactly why the disclosure form supplements your own inspections.
Lead-Based Paint Disclosure
For any home built before 1978, federal law requires the seller to disclose known lead-based paint hazards before the buyer is locked into a contract. The seller must provide any records or reports they have, give the buyer an EPA-approved lead hazard pamphlet, and allow at least 10 days for a lead inspection or risk assessment.3eCFR. 24 CFR Part 35 Subpart A – Disclosure of Known Lead-Based Paint and/or Lead-Based Paint Hazards Upon Sale or Lease of Residential Property Specific disclosure and warning language must be attached to the contract. The seller doesn’t have to test for lead, but can’t conceal what they already know.
Property Condition Documents
Inspection Reports
A general home inspection evaluates structure, roof, foundation, HVAC, plumbing, electrical, and major appliances, flagging defects, safety hazards, and components near the end of their useful life. Specialized inspections follow when the general inspection raises concerns: termite or pest, sewer line scopes, mold, or radon. Ask for any repair and maintenance records the seller has. Past work orders can reveal chronic issues a one-time inspection might miss, such as a basement that floods every spring or an HVAC system patched together over years.
Environmental Assessments
A Phase I Environmental Site Assessment identifies potential contamination by researching current and historical uses, reviewing government environmental records, interviewing owners and occupants, and conducting a visual site inspection. The current standard for the process is ASTM E1527-21.4ASTM. E1527 Standard Practice for Environmental Site Assessments Phase I is standard practice in commercial transactions and sometimes required by lenders. It’s less common for single-family residential purchases.
The stakes are real. Under federal environmental law, a buyer who fails to investigate contamination before purchasing can be held liable for cleanup, even if someone else caused it. Conducting all appropriate inquiries through a Phase I is a prerequisite for the innocent landowner defense under CERCLA.5U.S. Environmental Protection Agency. Third Party Defenses/Innocent Landowners If the Phase I identifies recognized environmental conditions, a Phase II follows with actual soil, groundwater, or building material sampling.
Appraisal Report
An appraisal determines market value based on condition, location, comparable sales, and other factors. Lenders require it because they won’t finance more than the property is worth. If the appraisal comes in below the agreed price, you can negotiate a lower price, cover the difference out of pocket, request a second appraisal if you believe the first was flawed, or walk away if your contract includes an appraisal contingency. A low appraisal is one of the most common deal-breakers in residential transactions.
Flood Zone Determination
If the property sits in a FEMA-designated Special Flood Hazard Area, federal law prohibits regulated lenders from issuing a mortgage unless the property carries flood insurance for the life of the loan.6Office of the Law Revision Counsel. 42 USC 4012a – Flood Insurance Purchase and Compliance Requirements A flood zone determination tells you whether that applies and whether you need to budget flood insurance on top of your homeowner’s policy. FEMA flood maps are updated periodically, so a property that wasn’t in a flood zone five years ago may be in one now.7FEMA. Understanding Flood Risk: Real Estate, Lending or Insurance
Financial Documents for Income Properties
For apartment buildings, office space, retail, and other income-producing property, the financial documents tell you whether the investment actually works.
Leases and Rent Rolls
The rent roll is a snapshot of every unit: who’s renting, what they pay, when their lease expires, and whether they’re current. Compare the rent roll against the actual lease agreements. Sellers sometimes present rent rolls that reflect asking rents or pro forma numbers rather than what tenants are actually paying. Read the leases to verify terms, renewal options, tenant improvement allowances, and any concessions the landlord granted.
Tenant Estoppel Certificates
An estoppel certificate is a document signed by each tenant confirming their lease terms: rent amount, start and end dates, security deposit balance, and whether the landlord is in default on anything. Once signed, the tenant generally can’t later contradict those statements. This protects you from discovering after closing that a tenant claims the landlord owed them a rent abatement or build-out allowance that never showed up in the seller’s financials. Insist on estoppel certificates from every tenant in commercial deals.
Income, Expense, and Utility Records
Two to three years of income and expense statements show the property’s actual operating history: rental income, vacancy losses, maintenance, management fees, insurance, and property taxes. Utility bills do double duty, establishing ongoing operating costs and flagging issues like abnormally high water bills that suggest a leak, or heating costs that hint at poor insulation. If the seller claims a certain net operating income, these records are how you verify it.
Loan Documents and Insurance Policies
When existing debt transfers with the property, review the mortgage terms, interest rate, repayment schedule, prepayment penalties, and any due-on-sale clause that could trigger immediate repayment. Insurance policies show current coverage limits, deductibles, premiums, and claims history. Claims history can reveal recurring problems the seller didn’t volunteer.
Legal and Regulatory Compliance
Zoning Report
A zoning report tells you what the property can legally be used for and regulates building height, lot coverage, setbacks, parking, and density. If you plan to change the use or expand the building, the zoning report tells you whether that’s allowed or whether you’ll need a variance or special permit. Nonconforming uses, meaning properties that were legal before a zoning change but wouldn’t be approved today, come with their own restrictions and can lose grandfathered status if you make certain changes.
HOA Documents
For properties in a homeowners association, review the CC&Rs (covenants, conditions, and restrictions), bylaws, financial statements, meeting minutes, and any pending special assessments. CC&Rs dictate what you can and can’t do with the property, from exterior paint to short-term rental restrictions. Financial statements reveal whether the HOA is well-funded or facing a shortfall that could trigger a special assessment after you close. Meeting minutes sometimes surface planned expenses or disputes the financial summary doesn’t capture.
Easements, Covenants, and Restrictions
Easements grant specific rights to third parties, such as a utility company’s right to access underground pipes or a neighbor’s right to use a shared driveway. Restrictive covenants impose limitations on property use that run with the land and bind future owners regardless of whether they agreed. Both appear on the title report, but pull and read the actual recorded documents. The scope of an easement or covenant is rarely obvious from a one-line title entry.
Permits and Certificate of Occupancy
Building permits confirm construction and renovation work was legally authorized. A certificate of occupancy certifies the finished structure meets local code and is safe for its intended use. Missing permits or an absent CO can derail closing. Most buildings can’t be legally sold or occupied without a valid CO, and unpermitted work can trigger code enforcement, fines, or requirements to tear out and redo the work. Verify every major renovation or addition has a corresponding permit and that the current CO matches the property’s actual use.
Litigation Records
A search of court records surfaces past or pending lawsuits involving the property or its owner. Boundary disputes, contractor claims, tenant lawsuits, environmental enforcement, and code violations all leave a trail. Active litigation can cloud title or signal liabilities that transfer with the property. Even resolved cases are useful; a landlord’s history of tenant suits can tell you something about deferred maintenance the rent roll won’t.
Tax and Reporting Documents
Property Tax Records
Property tax records verify the current assessed value, confirm whether taxes are current or delinquent, and show the annual burden you’ll inherit. Delinquent taxes create a lien that attaches to the property, not the person, so unpaid taxes from the prior owner become your problem at closing unless they’re resolved. In many jurisdictions, assessed value resets after a sale, which can mean a significant tax increase if the property was last assessed years ago at a lower value.
Form 1099-S
The sale of real estate triggers a federal reporting requirement. The closing agent files Form 1099-S with the IRS reporting the closing date, gross proceeds, and property address. This applies even when the transaction isn’t taxable, such as when a seller qualifies for the primary residence capital gains exclusion.8Internal Revenue Service. Instructions for Form 1099-S – Proceeds From Real Estate Transactions For buyers, the main point is record-keeping. Your purchase price becomes the cost basis for calculating gain or loss when you eventually sell.
FIRPTA Withholding for Foreign Sellers
If the seller is a foreign person or entity, federal law requires the buyer to withhold 15% of the amount realized on the sale and remit it to the IRS.9Internal Revenue Service. FIRPTA Withholding The amount realized includes cash paid, the fair market value of other property transferred, and any liabilities assumed. The seller typically provides an affidavit confirming they are not a foreign person. If the affidavit is missing or the seller is foreign, plan for the withholding and coordinate with the closing agent to handle the remittance correctly.
The Due Diligence Period and Your Leverage
Due diligence runs on a clock. The purchase contract sets a due diligence or inspection contingency period, commonly 7 to 17 days depending on the market and the deal’s complexity. During that window, you order inspections, review documents, and decide whether to proceed. How the contingency works mechanically varies by state. In some, contingencies stay in place until you submit written removal. In others, they expire automatically at the deadline.
Contingencies and Earnest Money
Contingencies are the buyer’s safety net. The most common are inspection, appraisal, financing, and title contingencies. If a problem surfaces during the contingency period and can’t be resolved, you can back out and keep your earnest money deposit. Try to back out after the contingency expires, or after waiving it, and you typically forfeit the deposit. Deposits also become non-refundable once certain contractual deadlines pass, even without a formal waiver.
Waiving contingencies became common in competitive markets and remains one of the riskier moves a buyer can make. Waive the inspection contingency and you generally lose the right to sue over defects a reasonable inspection would have caught, and you lose the ability to renegotiate based on what the inspection reveals. The few thousand dollars in competitive positioning disappear quickly when the roof needs replacing six months after closing.
Negotiating After Due Diligence
When inspections or document review uncover problems, you have leverage. The typical responses are requesting repairs before closing, asking for a seller credit at closing to cover repair costs, or negotiating a reduction in the purchase price. A seller credit gives you cash at closing to handle repairs on your own timeline, though lenders sometimes cap the amount a seller can credit. A price reduction lowers the loan amount and your monthly payment, and simplifies the appraisal because the lender is now financing a lower number. Which approach fits depends on the nature of the problem, your lender’s rules, and how motivated the seller is to close.