The Wood-Destroying Organism (WDO) report is one of the most important documents in any southern-state home purchase and one of the most misunderstood. A single line item on page 3 can mean a $200 treatment, a $30,000 structural repair, or a deal breaker — depending on how it's categorized. Knowing how to read the report means knowing what to negotiate, what to walk from, and what to safely ignore.
This guide walks through the standard NPMA-33 form, what each section means, and how to turn findings into contract action.
This guide is organized the way the decision actually plays out in practice: what matters, what does not, and the reasoning behind each recommendation. Numbers and ranges reflect 2026 Connecticut, Massachusetts, and New York conditions and pricing.
Quick answer
The WDO inspection produces a standardized report (most commonly the NPMA-33 form in the US) categorizing findings into four sections: Section I (visible active infestation), Section II (visible past infestation), Section III (visible structural damage), Section IV (conditions conducive to infestation). Any Section I or III finding typically requires remediation before close, especially for FHA/VA loans. Section II findings are negotiable. Section IV findings assign correction responsibility. Clean reports are valid for 30-90 days depending on lender and jurisdiction. Request the report at least 2 weeks before closing to allow treatment time if needed.
Field context
Northeast residential markets reward preparation more than most national guides convey. Inventory is chronically tight in desirable suburbs, transaction customs vary by state (attorney involvement, P&S structure, review periods, and contingency conventions all differ between CT, MA, and NY), and the housing stock includes a disproportionate share of pre-1940 homes whose inspection findings can derail inadequately-prepared buyers. Buyers and sellers who understand the sequence, the timing, and the standard variations before entering a specific transaction consistently outperform those who learn the process in real time.
Two preparation items matter disproportionately. The first is team assembly: buyer's agent, real estate attorney, inspector, mortgage lender, and insurance agent should be engaged before a specific property is in play, not after. The 10-to-14-day window between offer acceptance and binding contract is not the right time to be interviewing professionals. The second is decision pre-commitment: knowing in advance what offer price, contingency terms, and walk-away conditions feel acceptable. Under bidding-war pressure, homeowners routinely make decisions they would not have made with 48 hours to think; the antidote is to decide in calmer moments and stick to the decision.
Finally, the regional market conditions matter to timing but less than most buyers believe. Over a 7-to-10-year ownership horizon, a carefully-chosen property in a strong location outperforms a poorly-chosen property purchased at a market low. The leverage is in property and location selection, not in timing the market.
The NPMA-33 form at a glance
The National Pest Management Association form NPMA-33 is the standard WDO inspection report in most US states (some states have their own versions; Florida uses form WDIR-43). It has six main sections:
- Property and inspection details — address, date, inspector credentials
- Scope — what was accessible and inspected; what wasn't
- Findings by section (I, II, III, IV) — active, past, damage, conducive
- Recommended treatment — inspector's suggested remediation
- Obstructions to inspection — areas not accessible (finished basement, stored items, etc.)
- Signatures and certifications — inspector license, company, insurance
- Subterranean termite mud tubes on foundation
- Live termites visible in wood
- Drywood termite frass (fecal pellets) accumulating under infested wood
- Active carpenter ant frass with foraging workers
- Wood-boring beetle frass from current-generation emergence holes
- Old mud tubes that are dry and inactive
- Exit holes in wood from past beetle emergence (with no fresh frass)
- Dead carpenter ants or empty galleries
- Prior treatment records
- Hollow-sounding sills or joists
- Visibly eaten or weakened framing members
- Deteriorated wood requiring replacement
- Wood-to-ground contact (fence posts, deck posts, siding touching soil)
- Stored firewood close to house
- Excessive mulch depth against foundation
- Moisture problems — plumbing leaks, grading issues, clogged gutters
- Debris accumulation under decks or porches
- Tree stumps near foundation
- Inadequate ventilation in crawlspace
- Crawlspace too low to access
- Attic with inadequate access
- Finished basement that obscures sill plates
- Stored items blocking visual access
- Wall cavities (not accessible without invasive inspection)
- Liquid barrier termiticide
- Bait station system
- Fumigation (for drywood termites)
- Spot treatment (localized infestations)
- Wood replacement or repair
- Moisture remediation
- Final WDO report with clearance (if applicable)
- Treatment invoice and method details
- Any warranties or bonds included
- Lender-required forms (FHA/VA-specific where applicable)
- "Treatment history unknown" — prior activity with no documentation; negotiate treatment.
- "Inaccessible" covering large areas — low confidence in findings.
- "Conducive conditions" with Section III damage — if causes haven't been corrected, recurrence is likely.
- Multiple sections active — compounded risk that warrants engineering involvement.
- Recommendations for further inspection — the inspector is telling you they aren't confident the problem is bounded.
- Read the entire report, not just the summary.
- For Section I findings — require treatment and warranty at seller expense before close.
- For Section III findings — require structural engineer assessment; negotiate repair cost.
- For Section II findings — confirm prior treatment history; negotiate bond.
- For Section IV findings — assign correction responsibility in the contract.
- Address obstructions — require access or add contingency.
- Retain all documentation for future reference.
- Plan for ongoing termite bond post-close ($200-$500/year).
- A structural engineer for any Section III damage requiring scope assessment
- A separate licensed pest control operator for a second opinion if findings seem inconsistent or understated
- Your real estate attorney for contract implications and lender requirements
- Termite Damage: Signs, Scope, and Treatment Cost
- How to Read a Home Inspection Report: What Matters, What Doesn't
- Active Mold Growth: Remediation Cost and When DIY Is Okay
- Cost to Replace All Windows in a House
- Stela Report — pre-purchase property intelligence with disclosure, condition, and risk flags.
- Repair Calculator — modeled cost ranges by category and ZIP, calibrated with regional and complexity multipliers.
- Stela Guides — step-by-step repair walkthroughs reviewed by licensed professionals, with safety callouts and disclosure.
- National Pest Management Association — NPMA-33 form and guidance
- HUD Handbook 4150.2 — FHA WDO inspection requirements
- US Department of Veterans Affairs — VA WDO inspection requirements
- US Environmental Protection Agency — termite treatment and regulation
- State pest control board directories — license verification
Read every section, not just the summary at the bottom.
Section I: Visible active infestation
Active termites (or other WDOs) found at inspection. Types of findings:
Implication: Active infestation typically must be treated before closing for most loan types. FHA and VA require Section I clear. Conventional loans may allow closing with a treatment rider.
Negotiation stance: seller pays for treatment. Typically includes a warranty or bond. Get the treatment and warranty in writing before waiving the contingency.
Section II: Visible past infestation
Evidence of prior WDO activity, no current activity visible:
Implication: previous infestation indicates the property has had WDO pressure. May still be at risk if conducive conditions persist.
Negotiation stance: confirm that prior treatment records exist; ask for documentation of any termite bond or warranty still in force. If no prior treatment documentation, negotiate preventive treatment or termite bond at seller expense.
Section III: Visible structural damage
Physical damage from past or present WDO activity:
Implication: structural damage requires engineering assessment to determine repair scope. This is typically the most expensive WDO finding.
Negotiation stance: require a structural engineer's assessment of scope. Negotiate repair cost into the deal, either as seller completion before close or as a credit at close. For significant damage, walk away unless price reflects the full repair cost.
Section IV: Conditions conducive to infestation
Conditions that make WDO activity likely, even without current infestation:
Implication: most lenders do not require Section IV correction. Responsibility for correction is negotiable.
Negotiation stance: request seller correction of significant conducive conditions as part of the deal, particularly moisture-related ones. Minor items (mulch depth) often fall to the buyer.
Obstructions to inspection
The inspector notes any areas they couldn't see:
Implication: a report with extensive obstructions is less authoritative than one with full access. The home might have hidden problems the inspector couldn't find.
Negotiation stance: ask the seller to clear obstructions (move stored items, allow crawlspace access) and re-inspect, or add a contingency allowing re-inspection once obstructions are cleared. For homes with structurally blocked access (finished basements), negotiate reduced liability or a longer inspection contingency.
The inspector's treatment recommendations
The inspector typically lists recommended treatments for any active infestation:
Treatment choice matters. Liquid barrier creates a chemical perimeter; bait stations eliminate colonies; fumigation treats drywood termites comprehensively. Different situations call for different treatments.
Buyer action: verify that the recommended treatment matches the finding. A "liquid barrier" recommendation for drywood termites is inadequate.
Timing considerations
Report validity
WDO reports are typically valid for 30-90 days from inspection. If closing is delayed, the report may need to be refreshed.
Treatment timing
Liquid barrier treatment can typically be completed in 1-2 days. Bait station installation takes 1 day but monitoring begins immediately. Fumigation requires 2-5 days including preparation and ventilation. Structural repair scope drives most of any timing decision.
Warranty and bond transfer
Existing termite bonds sometimes transfer to new owners; sometimes they don't. Request bond transferability in writing before closing. Some bonds are property-specific; others are owner-specific.
Documentation delivery
Demand copies of:
Keep these forever — future buyers and your future insurance carrier may ask.
State-specific variations
Florida (WDIR-43)
Florida uses a modified form and has additional sections for drywood termite certifications. Real estate transactions in Florida almost universally include WDO inspection.
California
California requires Structural Pest Control Board-licensed inspectors. Reports are categorized differently (Section 1 vs. Section 2 under California standards).
Other southern states
Georgia, Alabama, Mississippi, Louisiana, Texas, and the Carolinas all have high termite pressure and similar NPMA-33 reporting standards.
Northern states
WDO inspection is less commonly required by lenders but is still advisable in any home purchase. Termite activity extends further north than many buyers realize.
Red flags in the report
Lines in the report that warrant immediate attention:
The buyer action sequence
When to call a professional
If the WDO report identifies significant findings, call:
Stela Home earns no referral fees from contractor connections.
Diligence and documentation
Diligence in a well-run transaction is less about any single tactic and more about consistent execution of a short list of practices. Pre-approval before offer (not pre-qualification). Written offer with clean contingencies rather than a verbal offer with implied terms. Three-to-five-year intent on neighborhood, commute, and school fit, not six-month intent. Inspection with a reputable, licensed inspector whose findings will be credible to the buyer's eventual lender and insurer. Written response to inspection findings — repair requests, credit requests, or escrow arrangements — rather than verbal agreements that become difficult to enforce at closing.
Documentation throughout the transaction creates the record that future diligence depends on. The closing file, the inspection report, the appraisal, the title search, and all written correspondence should be preserved in one place. The homeowner who can produce these documents three, seven, or ten years later has options — for refinancing, for insurance claims, for the eventual resale — that the homeowner with scattered or missing records does not.
Bottom line
The pattern that distinguishes well-executed transactions from difficult ones is consistent across markets: the parties who prepare early, understand the process before entering it, and treat the timeline as a sequence of deliberate steps rather than a series of reactive deadlines end up with better outcomes. That mindset is worth more than any specific tactical maneuver in the transaction itself.
Related Stela Home coverage
How Stela Home helps
Three Stela Home tools work together on this kind of decision: