Termite Inspection Cost: What WDO Inspections Cover and When You Need One

When your lender requires a WDO inspection before approving your loan, or when your real estate agent mentions "termite inspection" in the due diligence checklist, you need to understand what you're actually ordering, what it costs, and what happens if the inspector finds something.

What a WDO Inspection Is

WDO stands for Wood-Destroying Organisms. A WDO inspection is a targeted pest evaluation performed by a licensed pest control inspector — not your general home inspector, who only reports visible evidence but cannot diagnose or certify treatment.

The inspection covers:

• Subterranean termites — the most common and destructive type. They live in underground colonies and access wood through mud tubes along foundation walls.
• Drywood termites — found in warmer, coastal climates. They don't need soil contact and can infest attic framing, wall studs, and structural timbers directly.
• Carpenter ants — don't eat wood but excavate it to build galleries, weakening structural members.
• Wood-boring beetles — common in older hardwood framing; their larvae tunnel through wood for years before emerging.

The inspector looks for: termite mud tubes along foundation walls, hollow-sounding wood when tapped (a sign of interior excavation), frass (fine powdery droppings that look like sawdust), staining on drywall from moisture produced by subterranean termite activity, and damaged or structurally weakened framing in attics, crawlspaces, and basements.

What a WDO Inspection Costs

WDO inspections typically cost $100 to $300 depending on the property size, region, and whether the company is competing with other bids. In high-activity termite zones — the Southeast, Gulf Coast, Hawaii, California, and much of the Southwest — these inspections are routine and competitive.

Some pest control companies offer free WDO inspections with the hope of securing a treatment contract. That's not necessarily a problem, but know the incentive: a company that earns money on treatment has a reason to find problems. Get a second opinion if the treatment estimate seems large.

The report itself — often called a WDO report, clearance letter, or pest inspection certificate — is required by VA and FHA lenders in most states. Conventional lenders may or may not require it, but smart buyers order one regardless.

When to Order a WDO Inspection

Order it during the inspection contingency window, alongside your general inspection. Don't wait. The findings can affect your negotiation, and if you're using VA or FHA financing, a clean WDO report may be required before the lender issues a clear to close.

Properties that especially warrant WDO inspections:

• Any wood-framed home (most US residential construction)
• Homes in high-humidity regions — the Southeast, Gulf Coast, Pacific Coast
• Properties with wood-to-soil contact at the foundation (sill plates, wood steps, deck posts)
• Homes with evidence of moisture problems (past floods, plumbing leaks, poor drainage)
• Properties with crawlspaces, where termites are rarely visible until damage is advanced
• Homes near wooded areas or with heavy tree cover

What Treatment Costs If They Find Something

If the WDO inspection finds active termite activity or evidence of past infestation, you'll receive a scope and cost estimate for treatment:

Localized spot treatment ($300–$900): Used when activity is limited to a small, accessible area. Effective for drywood termites in a specific piece of framing.

Liquid chemical barrier (trenching) ($800–$1,800): The standard treatment for subterranean termites. The inspector trenches around the foundation and applies a liquid termiticide (commonly Termidor SC). This creates a chemical barrier that eliminates the foraging colony.

Structural fumigation (tenting) ($1,500–$3,500+): Required for severe or widespread drywood termite infestations. The entire structure is sealed and filled with a penetrating gas (sulfuryl fluoride). Residents must vacate for 24–72 hours.

Bait station systems ($1,000–$2,500 installed, plus annual monitoring): Slower-acting but non-invasive. Termite bait stations are placed in the soil around the perimeter and replaced as termites consume them, carrying toxicant back to the colony.

Separating the Treatment Cost from Wood Repair

Here's where buyers get surprised: pest companies often quote chemical treatment and structural wood repair as a bundled package, with a significant markup on the carpentry work.

The better approach: get separate quotes. Have a pest control company handle the chemical treatment, and hire a local carpenter or contractor to price the wood repair independently. Pest company markup on carpentry can reach 300–400% over what a local carpenter would charge.

Also understand that a WDO report noting "evidence of past termite activity" (inactive, no live termites) is different from "active infestation." Sellers who disclose past treatment and no current activity may have already resolved the issue. Verify through the treatment records and review any existing termite bond (a service contract guaranteeing re-treatment if termites return).

Transferring a Termite Bond at Closing

If the property has an existing termite bond, ask the seller to transfer it to your name at closing. Most termite bonds ($250–$600/year for continuation coverage) require an inspection before transfer. The current provider will inspect and either transfer the bond or note conditions requiring treatment before they'll take on coverage.

In some states — Louisiana is the most notable example — the transfer of a termite bond is a standard contractual requirement. Regardless of state, it's worth asking about.

UK, Australia, and Canada

In the UK, termites are not a significant concern — the climate doesn't support large termite populations. Building and structural surveys (Level 2 or Level 3 HomeBuyer Surveys) don't typically include pest inspection.

In Australia, a building and pest inspection is standard practice before buying. Combined reports typically run AUD $400–$700. Termite activity is common in Queensland, New South Wales, and parts of Western Australia, and damage from even a small colony can reach tens of thousands in structural repairs.

In Canada, carpenter ants are the primary wood-destroying insect concern (subterranean termites exist in parts of BC and Ontario). A separate pest inspection is less standardized than in the US, but worth commissioning on older properties.

What to Do With the Findings

If the WDO report shows active infestation or significant structural damage, you have negotiating power. Request that the seller pay for treatment (or credit you the treatment cost at closing), then separately negotiate for documented structural repairs. Keep these as two line items, not one.

For a complete framework on how to use inspection findings — including WDO results — to negotiate without blowing up the deal, see the Home Inspection Checklist & Red Flag Guide.