Termites cause billions of dollars in U.S. property damage every year — damage homeowners insurance typically does not cover. A wood-destroying organism (WDO) inspection, usually $75–$150 standalone, checks for termites, carpenter ants, wood-boring beetles, and wood-decay fungi before you buy. This guide explains what the inspector looks for, how to read the report's Section 1 vs. Section 2 findings, what treatment costs, and when your lender will require the inspection.

What "WDO" covers

WDO stands for wood-destroying organisms — the category, not just termites. A WDO inspection covers:

  • Subterranean termites — the most common and destructive in the U.S.; live in soil colonies and travel through mud tubes to reach wood.
  • Formosan termites — an aggressive subterranean species established in the Southeast and Gulf Coast; colonies can be far larger than native subterranean species.
  • Drywood termites — live entirely inside the wood they infest (no soil contact); common in warm coastal states; leave distinctive pellet-like frass.
  • Carpenter ants — don't eat wood but excavate it for nesting; associated with moisture-damaged wood.
  • Wood-boring beetles — including powderpost beetles; leave small exit holes and fine powder (frass) in hardwoods and framing.
  • Wood-decay fungi — rot from chronic moisture; destroys structural wood just as thoroughly as insects, and signals water problems worth chasing.

Terminology and report formats vary by state — some states license this as a "termite inspection" or "pest inspection" and use different forms. The concepts below are consistent even where the paperwork differs.

What the inspector actually checks

A WDO inspection is visual and non-invasive: the inspector examines accessible wood and the conditions that invite infestation, inside and out. Expect them to check:

  • Foundation perimeter — mud tubes climbing foundation walls, piers, or slab edges (subterranean termite highways); soil-to-wood contact anywhere.
  • Crawlspace or basement — tubes on piers and joists, damaged sill plates, moisture levels, and fungus on framing.
  • Exterior wood — siding, trim, fascia, decks, fences attached to the house, and firewood or lumber stacked against the structure.
  • Interior — baseboards, window and door frames, and hardwood floors for blistering, hollow sounds, frass piles, or discarded wings near windows (swarmer evidence).
  • Attic — drywood termite frass (tiny hexagonal pellets) and beetle exit holes in roof framing, where accessible.
  • Moisture conditions — the inspector notes plumbing leaks, poor drainage, and ventilation problems, because moisture is the universal WDO invitation. A WDO report that flags moisture but no active infestation is still valuable: it's a forecast.

Inspectors typically tap suspect wood with a probe or screwdriver and may use a moisture meter. They do not open walls. If the report says "no visible evidence," that means exactly that — hidden infestation behind drywall is always possible, which is why the moisture and conducive-conditions notes matter.

Reading the report: Section 1 vs. Section 2

In California-style reporting — the format many buyers encounter, though exact terminology varies by state — findings are split into two sections:

  • Section 1 — active infestation or infection, and damage already caused: live termites, frass indicating current activity, rotted wood, fungus. These are the "fix now" items. Lenders and buyers treat Section 1 findings as required corrections.
  • Section 2 — conditions conducive to future infestation but not currently infested: soil-to-wood contact, excessive moisture, cellulose debris (wood scraps, stumps, form boards) under or against the house, faulty grade. These are the "fix to prevent" items.

Not every state uses this split — some reports simply list findings with recommendations. Whatever the format, sort every finding into the same two buckets in your head: active problem versus invitation to a future problem. Negotiate Section 1 items as repairs; treat Section 2 items as your post-closing to-do list (and negotiate the expensive ones, like regrading or drainage work).

Common report language decoded: "evidence of previous treatment" means drill marks, plugged holes, or treatment stickers — ask for the treatment history and any warranty paperwork. "Inaccessible areas" (behind stored items, sealed crawlspace sections) means the inspector couldn't see there — clear the access and get those areas checked rather than accepting the gap.

Treatment options and what they cost

Treatment depends on the organism and the extent:

  • Spot/localized treatment — targeted application to a limited infestation (a single sill area, one section of fence-adjacent siding). Typically a few hundred dollars; appropriate only for genuinely contained, early findings confirmed by the inspector.
  • Soil/barrier treatment — trenching and treating soil around the foundation perimeter for subterranean termites, often paired with bait stations. Commonly $800–$2,000+ for a typical single-family home depending on linear footage and region.
  • Whole-structure fumigation — tenting the house for drywood termites or widespread infestation. Typically $1,500–$4,000+, scaling with house size; requires vacating the home for 2–3 days.
  • Wood repair/replacement — separate from treatment: rotted or termite-damaged framing, siding, or trim must be repaired after the organisms are eliminated. Costs vary wildly with extent; get a contractor quote, not a guess.

Key negotiation point: treatment without repair is half a job, and repair without treatment is money wasted. A Section 1 finding should be resolved as treatment plus repair of damaged wood, with documentation — and ask whether the treatment carries a renewable warranty or bond, which has real value to you as the buyer.

Lender requirements: when the inspection isn't optional

Conventional loans generally leave WDO inspections to buyer discretion (and local custom — in much of the Southeast, they're standard practice regardless). Government-backed loans are stricter:

  • VA loans — the VA requires a WDO inspection in many states (the list is long and includes most of the South, Southeast, and parts of the Midwest and West). Where required, the veteran buyer generally may not pay for it themselves — the seller typically pays, though local practice varies and your lender will spell out the rule.
  • FHA loans — the FHA appraiser can require a WDO inspection if they observe evidence of infestation or conducive conditions. If the appraiser flags it, it becomes a closing condition.

Even when no lender requires it, get the inspection in termite-active regions — the $75–$150 cost against the price of hidden structural damage is not a close call. Ask your agent what's customary in your market; in high-activity states, sellers often provide a current WDO report or treatment warranty as a matter of course.

Prevention basics after you buy

Whether the report was clean or you just finished treatment, the prevention checklist is the same:

  1. Eliminate soil-to-wood contact: keep at least 4–6 inches of visible foundation between soil/mulch and siding; pull mulch back from the house.
  2. Fix moisture: repair plumbing leaks promptly, extend downspouts 4+ feet from the foundation, and make sure grade slopes away from the house.
  3. Remove cellulose debris: no firewood, lumber, stumps, or cardboard stored against the house or in the crawlspace.
  4. Keep crawlspaces dry and ventilated; consider a vapor barrier if none exists.
  5. Schedule annual WDO inspections ($75–$150) and maintain any treatment warranty/bond — most require the annual inspection to stay valid.

What this guide does not cover — and when to hire a professional

This guide covers the buyer's inspection, report reading, and treatment basics. It does not cover choosing between treatment chemistries (that's the licensed pest operator's call, and product options vary by state regulation), structural assessment of damaged framing (if the report shows significant damage to sills, joists, or load-bearing members, a licensed contractor or structural engineer evaluates before you close), or legal questions about seller disclosure obligations (a real estate attorney in your state — disclosure law varies widely). Also note: WDO inspectors identify organisms and conditions; they don't quote repairs. Get the treatment quote from a licensed pest company and the wood-repair quote from a contractor as two separate numbers.

Frequently asked questions

How much does a termite/WDO inspection cost?

Typically $75–$150 as a standalone service, and many home inspectors or pest companies bundle it with the general inspection for less than the standalone price. In markets where it's customary, sellers sometimes order and pay for it — ask your agent before you pay out of pocket.

The report found old damage but no live termites. Should I worry?

Old, inactive damage with no live organisms is common and usually not a deal-breaker — but verify two things: that the damage was actually repaired (not just left in place) and whether there's a treatment history with a transferable warranty. Unrepaired damaged wood and no treatment records deserve a closer look and possibly a contractor's assessment.

What's the difference between a termite bond and a treatment warranty?

They're related: after treatment, many companies offer a renewable warranty (often called a bond in the Southeast) covering re-treatment — and sometimes repair — if termites return. It typically requires an annual inspection ($75–$150/year) to stay in force. A transferable bond on the house you're buying is a genuine asset; confirm it's paid current and transfers to you.

Can I skip the WDO inspection on a concrete-block or slab home?

No. Slab and block homes still have wood — roof framing, interior framing, trim, cabinets — and subterranean termites enter through slab cracks, expansion joints, and plumbing penetrations. Some of the worst infestations inspectors see are in slab homes where the attic framing was the entry point. The construction type changes where they look, not whether you inspect.

How fast do I need to act on Section 1 findings?

Before closing. Section 1 items — active infestation or existing damage — should be treated and repaired with documentation prior to closing, or covered by a closing credit based on written quotes. Don't accept "the seller will handle it after closing" without a holdback or escrow; once the deed records, your leverage is gone.