Once a year is the standard answer, and it's the right one for most homes in the Carolinas and Virginia. But "annual" is shorthand for something more useful: a professional check often enough to catch termites before the damage gets serious, with a paper trail that proves when the house was last clear. This guide covers why once a year is the benchmark, when you need an inspection sooner, how long a termite report stays valid when you buy or sell, and what a thorough inspection actually looks like.
Have a professional termite inspection once a year. Clemson's Department of Pesticide Regulation tells South Carolina homeowners to have the house "checked yearly by a licensed pest control operator," and NC State says annual inspections matter partly because the records let you date any damage later. Serious termite damage usually takes years to build, so a yearly check catches most problems early.
Get one sooner if you see swarmers or mud tubes, after renovations that disturb the soil around the foundation, and before buying a home. For a South Carolina sale, the standard contract calls for a CL-100 report dated within 30 days of closing.
Why Once a Year Is the Standard
The yearly schedule isn't arbitrary. It matches how fast termites work and what you'll need if you ever find damage.
- Damage builds over years, not weeks. NC State estimates a colony of 60,000 workers would eat about one foot of a 2x4 in a little over five months, and says serious termite damage usually takes about 3 to 8 years. An annual check gives several chances to catch it before it gets there.
- You can't date damage without records. NC State points out there's "no accurate method for determining the age of recently discovered damage." A record showing the wood was clear last year is your reference point, and it matters if you ever have a claim under a termite bond.
- It's what termite contracts are built around. Under a protection contract, NC State says the company "inspects (or should inspect) your house for termites annually," treating only if it finds activity.
- Swarming doesn't follow a short season. NC State notes the state's native subterranean termites swarm from late winter into September or October, so there's no "safe" part of the year to skip.
An annual inspection is not an annual treatment. NC State is clear: unless there's evidence of termite activity, "annual treatments are actually illegal under most termiticide labels."
How Often to Inspect, by Situation
| Situation | Recommended timing |
|---|---|
| Most homes | A professional inspection once a year, plus your own quick checks in spring |
| Bait station system | Stations checked at the intervals the product label sets, which Clemson DPR describes as "relatively frequent," and the house itself inspected at least annually |
| Liquid treatment under a bond | Annual inspection under the contract. Inspections must follow the label or the warranty, whichever is more frequent, under South Carolina's rules |
| You see swarmers or mud tubes | Right away |
| After renovations, additions or landscaping near the foundation | Soon after. NC State warns that disturbing treated soil can give termites a way in |
| Buying a home in SC | A CL-100 dated within 30 days of closing, under the standard SC REALTORS contract |
| Buying in NC or VA | A wood-destroying insect report before closing (WDIR 100 in NC, NPMA-33 in VA) |
How Long Is a Termite Inspection Good For?
A termite inspection report describes what was visible on the day of the inspection, nothing more. North Carolina's agriculture department says its official report is "not a warranty as to the absence of wood-destroying insects," and notes that termites need a crack of only 1/32 inch and can build tubes at about two and a half inches per hour, so they can show up shortly after an inspection.
That's why reports for a home sale have a short shelf life. South Carolina REALTORS' guidance on its standard purchase contract (form SCR310) says the CL-100 needs to be dated within 30 days of closing. For your own peace of mind, treat any report older than a year as out of date.
What a Thorough Inspection Looks Like
A good inspection takes time and covers the whole structure, inside and out:
- Foundation and exterior: mud tubes on foundation walls and piers, wood touching soil, mulch or soil piled above the siding, and leaks or drainage problems.
- Crawl space or basement: tubes on piers and joists, damaged or damp wood, and moisture levels.
- Interior: baseboards, door and window frames, cracks in slab floors, and areas around plumbing.
- Sounding and probing: tapping and probing wood that looks solid on the surface.
- A written report with a diagram, findings, conducive conditions and any areas that couldn't be reached.
A YouTube walkthrough from a law firm that handles termite damage claims shows what gets missed (about 232,000 views). Attorney Tom Campbell walks a badly damaged house in Birmingham, Alabama and points out what an inspector should have caught: a garage slab with no treatment drill holes along the foundation, a soil-filled planter box raised above the wood framing, and door casings that looked solid but sounded hollow when tapped. He also demonstrates "shadowing": turning off the lights and running a flashlight along the drywall to spot the bumps of hidden mud tubes.
Even a careful inspector can't see inside walls or under floor coverings. The University of Kentucky shows termite damage discovered only when a vacuum head broke through a baseboard. If areas were inaccessible, the report should say so.
What to Check Yourself Between Inspections
- Swarmers or piles of shed wings on windowsills and near doors, especially in spring.
- Mud tubes about the width of a pencil on foundation walls, piers or along baseboards.
- Wood that sounds hollow when tapped, or softens when probed with a screwdriver.
- Moisture problems: leaks, clogged gutters and downspouts that drain against the foundation.
- Wood-to-soil contact: mulch, soil or firewood piled against the house.
If something turns up, don't just spray what you can see. NC State notes that surface sprays kill the termites in view but don't protect the rest of the wood or the house. Call for an inspection so the activity can be confirmed and treated properly. For a full list, see how to tell if your home has termites.
Our termite control service handles inspections, treatment and annual monitoring across South Carolina, North Carolina and Virginia.
Key Takeaways
- Once a year is the standard for most homes, and it's what termite contracts are built around.
- Keep the reports. NC State says there's no accurate way to date damage without a record of when the wood was last clear.
- Inspect sooner if you see swarmers or mud tubes, after soil-disturbing work, and before buying.
- A report is a snapshot. SC home sales use a CL-100 dated within 30 days of closing.
- Annual inspection doesn't mean annual treatment. Re-treating without evidence of termites is illegal under most labels.
Frequently Asked Questions
Once a year for most homes. Clemson's Department of Pesticide Regulation tells South Carolina homeowners to have the house checked yearly by a licensed pest control operator, and NC State recommends annual inspections and keeping the records. Get one sooner if you see swarmers or mud tubes.
For most homes in the Carolinas and Virginia, yes. Termite damage builds over years, and NC State says there's no accurate way to date damage without a record of when the wood was last clear. An annual inspection catches activity early and gives you that record.
Every year, plus right away if you see swarmers, shed wings or mud tubes, after renovations or landscaping that disturb the soil around the foundation, and before buying a home.
A report only describes what was visible on the day of the inspection. For a South Carolina home sale, the standard SC REALTORS contract calls for a CL-100 dated within 30 days of closing. North Carolina's agriculture department notes termites can appear shortly after an inspection.
Under a typical termite protection contract, the company inspects the house annually, inside and out, including the crawl space or basement. Bait station systems also have the outdoor stations checked at the intervals on the product label.
At least once a year by a licensed professional, and whenever you buy or sell. In South Carolina, inspections under a warranty must follow the product label or the warranty, whichever requires more frequent inspection.
No. NC State explains the company inspects annually and treats only if it finds termite activity. Unless there's evidence of termites, annual treatments are illegal under most termiticide labels.
Mud tubes, damaged or hollow-sounding wood, swarmers and shed wings, wood touching soil, moisture problems and areas that couldn't be inspected. A good report includes a diagram and lists conditions that make termites more likely.
You can and should watch for swarmers, mud tubes, hollow wood and moisture between professional visits. But termites stay hidden in soil, wood and walls, and the University of Kentucky notes even experienced inspectors can miss hidden signs, so a yearly professional inspection is still worth it.
Sources: P. Alder and C. Hayes, "Termites: Biology and Control", NC State Extension; Clemson University Department of Pesticide Regulation, South Carolina Standards for the Control of Termites and Other Wood-Destroying Organisms; M. F. Potter, "Termite Control: Answers for Homeowners", University of Kentucky Entomology ENTFACT-604; NCDA&CS Structural Pest Control, A Homebuyer's Guide to the Wood-Destroying Insect Report; South Carolina REALTORS, "SCR310 Section #11 CL100 Wood Infestation Report" (2023); TermiteTom (Campbell Law), "Proper Termite Inspections", YouTube (2016).
Photo credits: USGS Native Bee Inventory and Monitoring Lab, Public domain; NY State IPM Program at Cornell University, CC BY 2.0, via Wikimedia Commons.