A termite inspection — formally called a wood-destroying organism (WDO) inspection — examines a property for evidence of termites, carpenter ants, wood-boring beetles, and wood-decay fungi. Lenders frequently require a WDO inspection before approving a mortgage. In Tennessee's warm, humid climate, wood-destroying organisms are a persistent threat to residential properties.
Insight Home Inspection Services, LLC provides professional WDO/termite inspections in Nashville, Knoxville, and Chattanooga. Since 2014, Insight has completed over 5,000 inspections across Middle and East Tennessee.
What WDO Means
WDO stands for wood-destroying organism. The term covers four categories of organisms that damage the structural wood in homes:
Subterranean Termites
Subterranean termites are the most destructive WDO in Tennessee. They live in underground colonies that can contain hundreds of thousands of individuals. Workers travel through mud tubes — pencil-width tunnels made of soil and saliva — from the ground to the wood in a structure. They consume wood from the inside out, often causing significant damage before any exterior signs appear. Tennessee sits in a region classified as having moderate to heavy termite activity by the U.S. Department of Agriculture.
Carpenter Ants
Carpenter ants do not eat wood, but they excavate galleries inside it to build nests. They prefer damp or decaying wood. Signs include piles of sawdust-like frass near baseboards, window frames, or door frames. Carpenter ants are common throughout Nashville, Knoxville, and Chattanooga.
Wood-Boring Beetles
Several species of wood-boring beetles are found in Tennessee, including powderpost beetles, old house borers, and anobiid beetles. Adult beetles lay eggs in wood. Larvae bore through the wood as they develop, creating internal tunnels. Evidence includes small round or oval exit holes in wood surfaces and fine powdery frass.
Wood-Decay Fungi (Wood Rot)
Wood rot is caused by fungi that break down the cellulose and lignin in wood. It requires moisture to grow. Brown rot causes wood to crack and crumble in a cube-like pattern. White rot causes wood to become soft, spongy, and stringy. Wood rot is commonly found in crawl spaces, areas around plumbing leaks, and improperly flashed exterior details.
Why Lenders Require a Termite Inspection
Most mortgage lenders require a WDO inspection — commonly called a "termite letter" — before closing. This is because wood-destroying organisms can compromise the structural integrity of a home, which affects the lender's collateral. FHA, VA, and USDA loans almost always require a termite inspection. Conventional loans may require one depending on the lender and the property's location.
What a Termite Letter Is
A termite letter is the official report issued after a WDO inspection. In Tennessee, it is formally known as the NPMA-33 form (National Pest Management Association). The report documents:
- Whether evidence of wood-destroying organisms was found
- The type of organism identified
- Whether the infestation is active or inactive
- Whether visible damage was observed
- Whether previous treatment was evident
The termite letter is submitted to the lender as part of the closing package. If WDO activity or damage is found, the lender may require treatment and/or repair before closing.
The Inspection Process
1. Exterior inspection — The inspector examines the foundation, exterior walls, siding, window frames, door frames, porches, decks, and any wood-to-soil contact points. Mud tubes on foundation walls are a primary indicator of subterranean termite activity.
2. Interior inspection — Accessible interior areas are examined, including baseboards, window sills, door frames, closets, and utility areas. The inspector checks for hollow-sounding wood, sagging floors, and visible damage.
3. Crawl space and basement — The crawl space is a critical area. The inspector examines floor joists, sill plates, support piers, and subflooring for evidence of WDO activity, mud tubes, frass, exit holes, and wood rot.
4. Attic — Accessible attic framing is inspected for beetle damage, carpenter ant activity, and wood rot.
5. Documentation — Findings are documented with photographs and recorded on the NPMA-33 form. The report is included with your Insight inspection report, delivered within 24 hours.
Signs of Termite and WDO Damage
Homebuyers and homeowners should watch for these indicators:
- Mud tubes on foundation walls, piers, or pipes
- Hollow-sounding wood when tapped
- Bubbling or peeling paint on wood surfaces
- Sagging or soft floors
- Small exit holes in wood surfaces
- Piles of fine sawdust or frass near wood
- Discarded wings near windows or doors (termite swarmers)
- Darkened or blistered wood
- Visible fungal growth or mushy wood in crawl spaces
Termite Prevalence in Tennessee
Tennessee's humid climate makes it one of the more termite-active states in the country. The combination of warm summers, mild winters, and abundant moisture creates favorable conditions for subterranean termites year-round. Termite swarm season in Nashville, Knoxville, and Chattanooga typically occurs from March through May, though swarms can happen at other times. Properties with poor drainage, wood-to-soil contact, or inadequate crawl space ventilation are at elevated risk.
Termite Inspection Cost
A WDO/termite inspection is available as a $150 add-on to any Insight home inspection in Nashville, Knoxville, or Chattanooga. The fee includes the full inspection, NPMA-33 termite letter, and documentation within your 24-hour inspection report. Insight's standard home inspections range from $450 to $1,000+ depending on square footage, covering 400+ items.
Frequently Asked Questions
Is a termite inspection required to buy a home in Tennessee?
It depends on the loan type. FHA, VA, and USDA loans typically require a WDO inspection. Conventional lenders may or may not require one. Regardless of lender requirements, a termite inspection is a sound investment given Tennessee's high termite activity.
What is the difference between a termite inspection and a termite treatment?
A termite inspection identifies the presence or absence of wood-destroying organisms. A termite treatment involves applying chemicals or installing bait systems to eliminate an active infestation. Insight performs inspections; treatment is performed by a licensed pest control company.
How long is a termite letter valid?
Most lenders accept a termite letter that is dated within 30 to 90 days of closing. Check with your lender for their specific requirement.
Can termites be present without visible signs?
Yes. Subterranean termites can feed inside wood for years before external signs appear. A professional inspection uses trained observation and probing techniques to detect activity that homeowners may miss.
Do new homes get termites?
Yes. New construction in Nashville, Knoxville, and Chattanooga is pre-treated during construction, but treatments have a limited effective life. Termites can infest any home regardless of age.
What happens if termites are found during a home purchase?
Termite findings are negotiable in a real estate transaction. Buyers commonly request that the seller pay for treatment and repair of any damage. Treatment for a standard infestation typically costs $500 to $2,000 depending on the method and extent.
Schedule a Termite Inspection Today
Contact Insight Home Inspection Services to add a WDO/termite inspection to your home inspection in Nashville, Knoxville, or Chattanooga.
- Nashville: (615) 436-0606
- Knoxville: (865) 274-0808
- Chattanooga: (423) 395-2020
- Email: info@inspectedbyinsight.com