What is a Termite Letter (CL-100) in South Carolina Real Estate
What Is a Termite Letter (CL-100) in South Carolina?
If you’re buying or selling a home in South Carolina, you’ll encounter the CL-100 — the state’s official Wood Infestation Report, universally known as the “termite letter.” It’s a one-page document that can make or break a real estate transaction. A clear CL-100 means no active wood-destroying organisms were found. An unfavorable CL-100 — showing active termites, beetle damage, or wood decay — triggers repair negotiations, treatment requirements, and sometimes deal collapse.
South Carolina’s climate makes the CL-100 more consequential here than in most states. The combination of warm temperatures year-round, high humidity, and abundant moisture creates ideal conditions for subterranean termites, Formosan termites (in the Lowcountry), powder post beetles, old house borers, and wood-decay fungi. Termites cause an estimated $500 million in property damage in South Carolina annually, and the CL-100 is the frontline defense in every real estate transaction.
What the CL-100 Report Covers
The CL-100 is a standardized form used across South Carolina. It’s completed by a licensed pest control operator who inspects the property for evidence of wood-destroying organisms. The report addresses:
| Inspection Element | What the Inspector Looks For | Common SC Findings |
|---|---|---|
| Subterranean Termites | Mud tubes, damaged wood, live insects, swarm evidence | Most common finding statewide |
| Formosan Termites | Carton nests, mud tubes, massive colonies | Coastal counties (Charleston, Beaufort, Horry) |
| Drywood Termites | Frass (fecal pellets), kick-out holes | Coastal areas, less common |
| Powder Post Beetles | Small round exit holes, fine powdery frass | Older homes, hardwood floors |
| Old House Borers | Oval exit holes, boring sounds in wood | Homes 5–10 years old with untreated lumber |
| Wood-Decay Fungi | Soft, discolored, or crumbling wood | Crawl spaces, areas with moisture |
| Conducive Conditions | Wood-to-soil contact, moisture, debris | Extremely common in SC crawl spaces |
How the CL-100 Process Works
Who Orders It
In South Carolina, the buyer typically orders and pays for the CL-100, though this is negotiable in the purchase contract. Some sellers proactively obtain a CL-100 before listing to address any issues upfront. The purchase contract usually specifies which party is responsible for the cost and who selects the inspector.
Who Performs It
The CL-100 must be performed by a licensed pest control operator certified by Clemson University’s Department of Pesticide Regulation (SC’s licensing authority for pest control, not LLR). The inspector must hold a current license in Category 7B (Wood-Destroying Organisms). Any pest control company — Terminix, Orkin, or local independents — can perform the inspection if their technician holds this certification.
What Happens During the Inspection
The inspector examines all accessible areas of the property, including:
- Exterior: Foundation walls, siding-to-foundation junction, window frames, door frames, deck/porch connections, landscaping timbers near the structure
- Interior: Baseboards, window sills, door frames, exposed wood in basements or crawl spaces
- Crawl space: Floor joists, sill plates, piers, girders, sub-flooring (the inspector must enter the crawl space if accessible)
- Attic: Rafters, sheathing, framing (if accessible)
- Garage: Framing, stored wood, foundation connections
The inspection takes 30–60 minutes for a typical home. The inspector probes wood with a screwdriver or awl to check for hidden damage, checks for mud tubes (the telltale sign of subterranean termites), and looks for moisture conditions that promote wood-destroying organism activity.
What’s NOT Inspected
The CL-100 has significant limitations that buyers should understand:
- Inaccessible areas: Behind finished walls, under insulation, inside sealed wall cavities, beneath carpet or flooring. Active infestation can exist in areas the inspector can’t see or access.
- Concealed damage: If termite damage is behind drywall, under paint, or otherwise concealed, the inspector won’t find it during a visual inspection.
- Future risk: A clear CL-100 means no evidence was found at the time of inspection. It does not guarantee the home is termite-free or won’t become infested next month.
- Treatment effectiveness: If the property has been treated previously, the CL-100 notes the treatment but doesn’t evaluate whether it’s still effective.
Understanding the CL-100 Report
The CL-100 form includes checkboxes and written descriptions in several sections:
| Section | What It Reports | Impact on Transaction |
|---|---|---|
| Section I — Infestation | Active wood-destroying organisms found | Treatment required before closing (usually) |
| Section II — Damage | Visible damage from past or current infestation | Repair negotiation between buyer/seller |
| Section III — Treatment | Evidence of previous treatment | Informational — check for active bond |
| Section IV — Conducive Conditions | Conditions promoting infestation (moisture, wood-soil contact) | Advisory — should be addressed but not always a dealbreaker |
| Section V — Inaccessible Areas | Areas that couldn’t be inspected | Buyer should understand limitations |
A “clear” CL-100 means Sections I and II show no findings — no active infestation and no visible damage. Section IV may note conducive conditions (common in SC), but these alone don’t constitute a failed report.
A CL-100 with findings in Section I (active infestation) or Section II (damage) triggers negotiation. The standard SC purchase contract typically gives the buyer the right to request that the seller treat active infestation and repair damage up to a specified dollar amount (often $1,000–$2,000, though this is negotiable). Costs above that threshold become a further negotiation point.
CL-100 Costs
| Service | Cost | Who Pays (Typical) |
|---|---|---|
| CL-100 Inspection | $100–$200 | Buyer |
| Treatment (if needed — liquid barrier) | $1,200–$3,500 | Negotiated (often seller) |
| Treatment (bait system) | $1,500–$4,000 | Negotiated (often seller) |
| Damage Repair (minor) | $500–$2,000 | Negotiated |
| Damage Repair (structural) | $3,000–$20,000+ | Major negotiation point |
| Annual Termite Bond (renewal) | $250–$500/yr | Buyer (ongoing after purchase) |
Factor CL-100-related costs into your purchase budget. Our closing cost calculator helps you model the total transaction cost including inspections and potential treatment.
Formosan Termites: SC’s Worst Pest
The Formosan subterranean termite deserves special attention in any SC real estate transaction, particularly in Charleston, Beaufort, and Horry counties. These are not ordinary termites:
- Colony size: A single Formosan colony can contain 1–10 million individuals, compared to 100,000–1 million for native subterranean species.
- Consumption rate: A large Formosan colony can consume a pound of wood per day — roughly 13 ounces of structural framing daily.
- Above-ground nesting: Unlike native subterranean termites that return to the soil, Formosans can build above-ground “carton nests” inside walls, maintaining moisture through built-in moisture sources. This means they can infest upper floors and roofs, not just areas near the ground.
- Damage timeline: A Formosan colony can cause visible structural damage within 3–6 months of establishing in a home — far faster than native species.
In Formosan-active areas, a standard CL-100 inspection is even more important but also more limited. Formosan damage inside walls may not be visible during a visual inspection. If you’re buying in a Formosan-active zone, consider supplemental inspections: thermal imaging ($200–$400) can detect heat signatures of large colonies behind walls, and acoustic monitoring devices can detect feeding activity.
Termite Bonds: What Buyers Need to Know
A “termite bond” is an annual service agreement with a pest control company that provides ongoing protection. There are two types:
| Bond Type | Annual Cost | What It Covers |
|---|---|---|
| Retreat Bond | $200–$350/yr | Company re-treats if termites return. Does NOT cover damage repair. |
| Repair Bond | $350–$500/yr | Company re-treats AND repairs any termite damage found. Much stronger protection. |
When purchasing a home in SC, ask whether the seller has an active termite bond and whether it’s transferable. Transferring an existing bond saves you the initial treatment cost ($1,200–$4,000) and provides a documented treatment history. Most bonds are transferable with a transfer fee ($50–$200) and a new inspection.
If the property doesn’t have an existing bond, establishing one after purchase is strongly recommended — it’s the single best ongoing investment in property protection for SC homeowners. The cost of a repair bond ($350–$500/year) is trivial compared to potential termite damage repair costs ($5,000–$50,000+).
What to Do If the CL-100 Shows Problems
- Don’t panic. Active termite findings are common in SC — it doesn’t automatically mean the house is ruined. Many homes have had termite activity at some point and have been successfully treated.
- Get a treatment quote. The pest control company that performed the CL-100 can provide a treatment estimate. Get a second quote from an independent company for comparison.
- Assess the damage severity. Minor surface damage to non-structural wood is very different from structural damage to floor joists, sill plates, or support beams. For structural concerns, consider hiring a structural engineer ($300–$500) for an independent assessment.
- Negotiate with the seller. Standard practice in SC is for the seller to pay for treatment of active infestation and repair of damage, at least up to the contract’s specified threshold. Your agent should negotiate this on your behalf.
- Consider the long-term picture. A property with a current active infestation that’s been treated and bonded may actually be in better shape going forward than one with no treatment history in a termite-active area. The treatment and bond provide known, ongoing protection.
Use our home buying guide for more on managing inspection findings during the SC purchase process.
SC Termite Risk by Region
| Region | Termite Risk Level | Primary Species | Annual Monitoring Cost |
|---|---|---|---|
| Charleston / Lowcountry | Very High | Formosan + Eastern Subterranean | $350–$500 |
| Hilton Head / Beaufort | Very High | Formosan + Eastern Subterranean | $350–$500 |
| Myrtle Beach / Grand Strand | High | Eastern Subterranean, some Formosan | $300–$450 |
| Columbia / Midlands | High | Eastern Subterranean | $250–$400 |
| Greenville / Upstate | Moderate-High | Eastern Subterranean | $250–$350 |
No part of South Carolina is free from termite risk. The entire state falls in USDA termite infestation probability zones rated “moderate to heavy” or “very heavy.” Annual monitoring through a termite bond is the standard practice statewide.
CL-100 Tips for Sellers
If you’re selling a home in South Carolina, proactively addressing the CL-100 can prevent deal delays and protect your negotiating position:
- Get a pre-listing CL-100. Ordering your own CL-100 before listing ($100–$200) lets you identify and address any issues before a buyer’s inspection turns them into negotiation leverage. Treating active infestation before listing removes a common deal-killer and demonstrates good faith to buyers.
- Maintain your termite bond documentation. Buyers and their agents ask about termite bonds early in the process. Having records showing 5, 10, or 15+ years of continuous bond coverage is a strong selling point — it shows the property has been monitored and protected. If your bond has lapsed, consider reinstating it before listing ($250–$500 for reinstatement inspection plus first-year premium).
- Address conducive conditions. Section IV findings on the CL-100 (wood-to-soil contact, debris in crawl space, moisture issues) aren’t deal-breakers, but they create buyer anxiety. Fixing these low-cost issues ($200–$1,000 in most cases) before listing cleans up the CL-100 report and reduces buyer objections.
- Disclose known termite history honestly. SC’s seller disclosure form asks about past pest damage and treatment. Disclose everything — a treated and bonded property with documented history is actually more reassuring to informed buyers than a property with no termite history in a high-risk zone, because the treatment provides known ongoing protection.
Use our seller net proceeds calculator to factor CL-100-related costs into your estimated sale proceeds.
Frequently Asked Questions
Is a CL-100 required in South Carolina?
The CL-100 is not technically required by state law, but it’s required by virtually all mortgage lenders and is standard in the SC Association of Realtors purchase contract. In practice, you can’t close on a financed home purchase in SC without one. Cash purchases can technically skip it, but doing so is strongly inadvisable given SC’s termite risk.
How much does a CL-100 cost?
The inspection costs $100–$200, with most companies charging $125–$175 for a standard residential property. The buyer typically pays, though this is negotiable. Given the potential cost of undiscovered termite damage ($5,000–$50,000+), the inspection fee is a trivial expense.
How long is a CL-100 valid?
There’s no legal expiration, but most lenders and real estate contracts require the CL-100 to be performed within 30 days of closing. Some lenders require it within 15 days. A CL-100 from several months ago may need to be updated, as conditions can change.
What if termites are found?
Active infestation findings trigger treatment requirements. In a typical SC transaction, the seller pays for treatment (liquid barrier or bait system, $1,200–$4,000) and repair of any visible damage. If the costs exceed the contract’s specified threshold, further negotiation occurs. In severe cases, the buyer may renegotiate the purchase price, request significant credits at closing, or walk away from the deal.
Can I choose my own CL-100 inspector?
Yes. As the buyer (assuming you’re paying), you have the right to select the pest control company. Your agent may recommend one, but you’re not obligated to use their suggestion. Choose a company licensed by Clemson’s Department of Pesticide Regulation with good reviews and no business relationship with the seller that could create a conflict of interest.
Should I get a termite bond after buying?
Absolutely. In South Carolina, maintaining an active termite bond is one of the most important ongoing property maintenance investments. A repair bond ($350–$500/year) covers both re-treatment and damage repair if termites are found during annual inspections. The cost is modest relative to the catastrophic repair costs ($10,000–$50,000+) that can result from undetected termite activity. Find pest control companies through our home services directory and budget for the bond using the maintenance calculator.
What’s the difference between a CL-100 and a home inspection?
A CL-100 is performed by a licensed pest control operator and focuses exclusively on wood-destroying organisms (termites, beetles, fungi) and conditions conducive to infestation. A home inspection is performed by a licensed home inspector and covers all major systems (roof, structure, electrical, plumbing, HVAC, etc.) but is not a substitute for the CL-100. Most SC transactions require both, and they’re performed by different professionals with different expertise. The mortgage calculator helps you budget for both inspections within your total closing costs.
What are “conducive conditions” on a CL-100?
Conducive conditions are environmental factors that make your home more attractive to wood-destroying organisms. Common findings on SC CL-100 reports include wood-to-soil contact (deck posts or siding touching the ground), excessive moisture in crawl spaces, debris or scrap wood stored against the foundation, mulch piled too high around the home’s perimeter, and inadequate ventilation in crawl spaces. Conducive conditions alone don’t fail a CL-100 — they’re advisory notes recommending correction. However, they’re worth addressing because they significantly increase your risk of future infestation. Most are inexpensive to fix: removing wood debris, adjusting mulch levels, improving drainage, and ensuring proper crawl space ventilation cost $100–$500 in most cases.