Termite & WDO Inspection Guide: Cost, What's Covered & When You Need One
Termites cause an estimated $5 billion in property damage annually in the United States. A WDO inspection — separate from your standard home inspection — is the only way to know whether wood-destroying organisms are present before you close.
What Is a WDO Inspection?
A WDO inspection (Wood Destroying Organism inspection) is a formal evaluation performed by a licensed pest control operator or entomologist. It is broader than a termite-only inspection and covers all organisms that destroy wood in a home's structure:
- -Subterranean termites — the most destructive species; live in soil and travel through mud tubes
- -Drywood termites — live inside wood with no soil contact; common in coastal and southern states
- -Formosan termites — an aggressive subterranean species; highly destructive in the Gulf Coast region
- -Carpenter ants — do not eat wood but excavate it for nesting; can cause significant structural damage
- -Wood-boring beetles — lay eggs in wood; larvae tunnel through structural lumber
- -Wood-destroying fungi — commonly called wood rot; caused by moisture intrusion; weakens structural members
A standard home inspection does not include a WDO report. Your home inspector may note visible wood damage, but they are not licensed to certify a property as pest-free or produce the official WDO clearance letter that most lenders require.
Who Performs WDO Inspections?
WDO inspections must be performed by a licensed pest control operator (PCO) or a state-licensed wood-destroying organism inspector. Requirements vary by state, but in most states the inspector must hold a specific WDO or termite inspection license — separate from a general contractor or home inspector license.
Most WDO inspections are conducted by pest control companies. Some companies specialize exclusively in inspections and do not offer treatment services, which eliminates any potential conflict of interest. You can also hire independent WDO inspectors through real estate agents or your lender's approved vendor list.
Note that some states, including Florida, Texas, and Georgia, have specific licensing requirements and official WDO report forms that must be used. Ask your inspector which form they provide and whether it meets your lender's requirements.
What's Included in a WDO Report?
A complete WDO report documents the inspector's findings for the entire accessible structure, including the foundation, crawl space, attic, garage, and all wood-framed components. A standard WDO report includes:
Live insects, fresh damage, active mud tubes, or frass (insect droppings) indicating current pest activity.
Old damage, prior treatment evidence, or repaired areas — important even if no active infestation is found today.
Wood-to-soil contact, excessive moisture, leaking pipes, improperly graded soil, or wood debris under the home.
Inaccessible areas such as finished walls, under insulation, or blocked crawl spaces are noted as limitations.
The inspector's license number and signature, confirming the report is legally valid for lender submission.
Termite Risk by Region
Termite activity and species vary significantly by geography. Understanding your region's risk level helps you decide how urgently to prioritize a WDO inspection.
| Region | Risk Level | Key Factors |
|---|---|---|
| Southeast (FL, GA, AL, MS, LA, SC) | HIGH | Year-round warm/humid climate; Formosan and subterranean termites |
| South Central (TX, AR, OK) | HIGH | Subterranean termites highly active; significant damage rates |
| Mid-Atlantic (NC, VA, MD, DC, DE) | HIGH | Warm summers; dense housing stock with crawl spaces |
| Southwest (AZ, NM, CA coastal) | MODERATE-HIGH | Drywood termites active; desert subterranean species |
| Midwest (IL, IN, OH, MO, KS) | MODERATE | Subterranean termites present; seasonal activity |
| Pacific Northwest (WA, OR) | MODERATE | Dampwood termites; wood rot fungi highly active |
| Mountain West (CO, UT, ID, WY) | LOW-MODERATE | Drier climate limits activity; carpenter ants prevalent |
| Northern States (MN, WI, MI, ND, SD) | LOW | Cold winters limit termite populations |
When Do Lenders Require a WDO Inspection?
WDO inspections are required by certain loan programs, particularly government-backed mortgages. If you're using one of the following loan types, expect your lender to mandate a WDO report before closing:
Always required in moderate-to-high termite risk areas (approximately 48 states). The veteran typically cannot pay for it — the seller or lender must cover the cost.
Required when the appraiser or lender identifies evidence of infestation, or when local state law requires it. Not automatically required in all cases.
Required in moderate-to-heavy termite infestation probability zones per the USDA termite infestation probability map.
Not federally required, but individual lenders may require one based on property condition, location, or appraisal findings.
Signs of Termite Damage to Watch For
During a showing or home walkthrough, watch for these warning signs before your formal WDO inspection:
- -Mud tubes on foundation walls, piers, or crawl space framing — a hallmark of subterranean termites
- -Hollow-sounding wood when tapped — termites consume wood from the inside out
- -Discarded wings near windows, doors, or light sources — shed by swarming termites in spring
- -Frass (droppings) — tiny pellets that resemble sawdust near wood, indicating drywood termites
- -Buckling floors or sagging wood — structural members weakened by long-term termite activity
- -Paint bubbling or peeling on wood surfaces — can indicate moisture damage or active infestation beneath
- -Soft or spongy wood at door frames, window sills, or baseboards — often combined with fungal decay
Termite Treatment Costs
If a WDO inspection finds active termites, treatment costs depend on the species, severity, and treatment method. Here's what to expect:
If a WDO report reveals active termites or prior damage, you can negotiate with the seller to cover treatment costs or reduce the purchase price. In many states, sellers are legally required to disclose known pest infestations. Always get multiple treatment quotes before agreeing to any seller-arranged remediation.
Frequently Asked Questions
Standard home inspectors are not licensed pest control operators and do not provide WDO (Wood Destroying Organism) reports. They may note visible wood damage during their inspection, but a formal termite or WDO inspection must be performed by a licensed pest control company.
A termite or WDO inspection typically costs $75 to $150 for a standard single-family home. Some pest control companies offer free inspections with the expectation of being hired for treatment if problems are found.
A WDO (Wood Destroying Organism) inspection covers all organisms that damage wood: subterranean termites, drywood termites, Formosan termites, carpenter ants, wood-boring beetles, and wood-destroying fungi (rot). The inspector produces an official WDO report, which is required by many lenders.