Termite Inspection: What Home Buyers Need to Know
Termites cause an estimated $5 billion in property damage in the United States every year—damage that homeowners insurance typically doesn’t cover. For home buyers, a termite inspection is one of the most important (and often overlooked) parts of due diligence. Here’s what you need to know before you close.
What Is a Termite Inspection?
A termite inspection—formally called a Wood-Destroying Organism (WDO) inspection in most states—is a specialized examination performed by a licensed pest control professional. Inspectors look for:
- Active termite infestations (live insects, active mud tubes, fresh frass)
- Termite damage (wood that’s been hollowed or structurally compromised)
- Evidence of past treatment (drill holes, bait stations, prior warranties)
- Other wood-destroying organisms — carpenter ants, carpenter bees, wood-boring beetles, and in some regions, wood-decay fungi
The result is a WDO inspection report (sometimes called a termite letter or “CL-100” in some states) that documents findings and any conditions conducive to infestation.
Signs of Termite Activity
Knowing what inspectors look for helps you understand the report:
Subterranean Termites (Most Destructive)
Subterranean termites—the most common and destructive species in the U.S.—live underground and build mud tubes to travel from soil to wood.
Key signs:
- Mud tubes — Pencil-width earthen tunnels along foundation walls, pier blocks, or structural lumber. The most reliable visible indicator.
- Swarmers — Winged reproductive termites (often mistaken for flying ants). If found indoors, indicates an active colony nearby.
- Discarded wings — Swarmers shed wings after finding a mate; piles near windowsills or doors are a warning sign.
- Damaged wood — Wood that sounds hollow when tapped, or that crumbles to reveal a honeycomb-like interior with soil particles and fecal pellets.
- Blistered paint or bubbling surfaces — Can indicate termite activity or moisture damage beneath the surface.
Drywood Termites (Warm Climates)
Drywood termites live entirely within wood and are common in coastal and southern states. They don’t need soil contact.
Key signs:
- Frass — Tiny, sand-like fecal pellets kicked out of kick-out holes (distinctive look: 6-sided, wood-colored)
- Surface damage — Wood appears smooth externally but is heavily tunneled inside
- Swarmers — Similar to subterranean but emerging from wood directly
Formosan Termites
An invasive subterranean species concentrated in Gulf Coast states and Hawaii. Far more aggressive than native subterranean termites—a single colony can number in the millions and cause structural damage within months.
The Termite Inspection Process
1. Exterior inspection Inspector examines the foundation perimeter, wood-soil contact, siding, eaves, window and door frames, decks, fences, and any wood debris near the home.
2. Interior inspection Inspector checks basement/crawl space, utility chases, garage framing, subfloor, and accessible structural wood. Termites follow moisture and ground contact—inspectors focus on those pathways.
3. Attic inspection When accessible, the attic is checked for evidence of drywood termites, moisture damage, or prior infestation.
4. Documentation Inspector completes a WDO report identifying active infestations, evidence of prior infestations, conducive conditions (wood-soil contact, foam insulation at foundation, moisture), and whether prior treatment is in place.
What inspectors cannot check: Interior wall cavities, areas concealed by insulation or finishes, and spaces with no physical access. A clean report doesn’t guarantee termite-free conditions everywhere.
Termite Inspection Cost
| Property Type | Typical Cost |
|---|---|
| Single-family home (standard) | $75–$150 |
| Large home or estate | $150–$300 |
| VA loan (often required) | $75–$150 (seller typically pays) |
| FHA loan | Often required; same range |
| Re-inspection after treatment | $50–$100 |
Note: For VA and FHA loans, termite inspections are often required by the lender. In many transactions, the seller pays for the WDO inspection and any required treatment as a condition of sale.
Termite Treatment Options
If an active infestation or significant damage is found, treatment options depend on termite species, extent of infestation, and home construction.
Liquid Termiticide (Soil Treatment)
A chemical barrier is applied to the soil around and under the foundation, either repelling or killing termites that cross it. Standard treatment for subterranean termites.
- How it works: Trenching and treating soil around the perimeter; drilling through slabs where needed
- Duration: 5–10 years depending on product
- Cost: $1,000–$3,000 for average home; $2,000–$6,000+ for larger homes or extensive infestations
Bait System (Termite Monitoring Stations)
Bait stations installed around the perimeter attract termites, which carry a slow-acting insecticide back to the colony. Effective but slower acting than liquid treatment. Requires ongoing monitoring.
- Cost: $1,200–$3,500 initial installation; $400–$900/year monitoring contract
- Best for: Light to moderate infestations; ongoing prevention; environmentally sensitive sites
Fumigation (Whole-House Tenting)
For drywood termite infestations throughout the home, fumigation with sulfuryl fluoride is the most thorough treatment. The home is sealed in a tent and fumigated for 24–72 hours.
- Cost: $1,200–$4,000 for average home; $2,000–$8,000 for larger homes
- Disruption: Family and pets must vacate for 2–3 days
- Does not prevent re-infestation — no residual barrier
Spot/Localized Treatment
For isolated drywood termite infestations, direct wood injection with liquid termiticide or application of borate treatments can address contained problems without full fumigation.
- Cost: $250–$1,500 depending on scope
Heat Treatment
Affected areas are heated to 120°F+ to kill termites without chemicals. Effective for localized drywood termite treatment.
- Cost: $1,000–$2,500 per area treated
Treatment Cost Summary
| Treatment Type | Typical Cost Range |
|---|---|
| Liquid soil barrier (subterranean) | $1,000–$6,000 |
| Bait system (initial) | $1,200–$3,500 |
| Bait system (annual monitoring) | $400–$900/yr |
| Fumigation (whole house) | $1,200–$8,000 |
| Spot treatment | $250–$1,500 |
| Heat treatment | $1,000–$2,500 |
Termite Damage Repair Costs
Treatment eliminates the infestation—but doesn’t fix structural damage already done. Repair costs depend on which wood members were affected.
| Affected Component | Repair Cost |
|---|---|
| Sill plate (single section) | $500–$2,000 |
| Floor joist replacement | $1,000–$5,000 |
| Subfloor sections | $1,500–$5,000 |
| Wall stud replacement | $500–$2,000 per wall |
| Structural beam repair/sister | $1,500–$6,000 |
| Deck framing | $1,000–$8,000 |
| Major structural repair | $5,000–$30,000+ |
Prevention: Reducing Termite Risk
Once you own the home, these practices reduce the risk of infestation:
Eliminate wood-soil contact:
- Keep wood siding, door frames, and trim at least 6 inches above soil
- Remove old stumps, buried lumber, and wood debris near the foundation
Manage moisture:
- Fix leaks promptly (roof, plumbing, HVAC condensate)
- Ensure gutters drain well away from foundation
- Install vapor barrier in crawl spaces
- Keep crawl space vented and dry
Reduce entry points:
- Seal cracks in foundation
- Replace damaged wood trim before it deteriorates further
- Avoid using wood mulch directly against the foundation
Regular inspections:
- Annual termite inspections are standard practice in termite-prone regions (Southeast, Gulf Coast, Southwest, Pacific Coast)
- Active monitoring contracts provide early detection
What a Termite Warranty Covers
Many sellers provide a transferable termite bond/warranty from a pest control company. Understanding what it covers matters:
Retreatment warranty: If termites return within the coverage period, the pest control company will retreat at no charge. Does NOT cover repair costs.
Repair warranty: Higher-end bonds cover structural repair costs if termites return and cause damage. These are more expensive but more valuable.
Bond transfer: Most companies allow new owners to assume an existing bond for a transfer fee ($50–$250). Always check:
- When was the last inspection?
- Is it a retreatment or repair bond?
- When does it expire?
- What are the annual renewal costs?
Frequently Asked Questions
Is a termite inspection required when buying a home? Required for VA and FHA loans in most states. Not universally required for conventional loans, but strongly recommended in termite-prone regions. Some states mandate WDO reports in all real estate transactions.
Who pays for the termite inspection? Negotiable, but sellers commonly pay in markets where it’s standard practice. For VA loans, the seller is required to pay.
What happens if active termites are found? You can request the seller treat before closing (get documentation), negotiate a credit, or in severe cases, exit using your inspection contingency. Never close without knowing the extent of damage.
What’s the difference between termites and carpenter ants? Carpenter ants hollow out wood to nest but don’t eat it. They don’t build mud tubes. Termites eat wood and (subterranean species) build mud tubes. A WDO inspector will distinguish between them—both warrant attention.
How long does termite treatment last? Liquid soil barriers: 5–10 years depending on the product. Bait systems: ongoing (require annual monitoring). Fumigation: no residual protection. Treatment type and duration should factor into your purchase decision.
Can I skip the inspection in a state with few termites? Termites are found in every U.S. state except Alaska. Subterranean termites are most prevalent in warm, humid climates, but drywood and dampwood termites extend into northern states. The inspection cost is low relative to the risk of missing an infestation.
Bottom Line
A termite inspection is cheap insurance—$75–$150 to protect yourself against a problem that can cost thousands to tens of thousands to fix. In termite-prone regions, skip it at your peril. Get the WDO report, understand what’s in it, ask about existing bonds, and factor treatment and repair costs into your negotiation if anything is found.