Formosan subterranean termites are established along the Charleston coast, and the crawl spaces here give them a steady supply of damp wood.
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Formosan subterranean termites are an introduced species that has been established in the Charleston area since the 1950s. They live in soil and tunnel up into the framing of a house, so a technician inspects the crawl space and the sub-floor wood, then treats the soil and the points where termites reach the structure.
Formosan subterranean termites were introduced into South Carolina in the 1950s, and Clemson's Home and Garden Information Center dates their arrival in Charleston to the mid-1950s. Clemson entomologists count the species as established in 16 counties, with infestations concentrated in the coastal belt from Charleston south to Beaufort. For a North Charleston homeowner, termite work is a baseline service rather than an occasional repair.
People are the main cause of the species spreading, mostly by moving infested material, and Clemson cites old railway ties as one route. A colony does not have to start in your yard. It only needs wood or soil that came from a place where it already lives, and Clemson describes infestations in many areas of Charleston County.
Houses here also give termites what they need. Many homes sit over vented crawl spaces, where humid summer air meets cooled ducts and joists and condenses. That damp wood feeds decay fungi and draws termites to the sub-floor framing. A good visit separates termite activity, wood decay and plain moisture, since each needs a different fix. See crawl-space moisture and wood decay.
Timing is the clearest difference. Formosan swarms come out in the evening, often drawn to lights, from mid-May into July. Native subterranean termites swarm in early spring, usually in the afternoon.
Clemson describes the native species swarming in early spring during the afternoon, and the Formosan later in the day and later in the year. That gap tells a technician where to look first, and it changes the questions asked on the phone.
A swarm alone is a weak guide, since a swarm from a neighbor's yard can drift onto a porch. What matters is what the crawl space and perimeter show. A swarm emerging from a sub-floor vent, a wall void or a door-frame gap is worth following up.
Formosan swarmers are usually seen in the evening, drawn to lights, when colonies release winged reproductives. Clemson's guidance puts the main window from mid-May into July.
Homeowners often see the swarm only after dark, near a porch light or a window left on. Swarmers collect on screens, lamps and door sills, and people often find shed wings the next morning on a ledge or under a fixture.
Sources differ on the start. Clemson's guidance says mid-May, while a local newspaper account put emergence in a narrower late-May to early-June window. The difference matters less than the pattern. An early-evening swarm in the warm months is a reason to call.
No. The species is found across the coastal counties, and slab homes can be reached at the perimeter, though the inspection looks different. Construction decides where a technician looks, not whether termites are a concern.
Older homes on vented crawl spaces give a technician open framing to check, and the mid-century houses across West Ashley, Hanahan, older North Charleston and Goose Creek fit that pattern. Their damp, enclosed framing is why moisture and termite work go together here.
Newer slab homes are not immune. The inspection moves to the perimeter, slab penetrations and utility lines at the foundation edge. The slab home pest control page explains that method.
No price is published on this site. Construction, access, scope and the number of structures change the work. A technician explains the price on site, and it is approved before work starts.
Construction comes first. A crawl-space house, with piers and a sub-floor to inspect, takes different work from a slab house with a perimeter to check. Access matters as well, since stored items, plumbing or shrubs against the foundation slow an inspection.
Scope is the other driver. A spot treatment at one point of activity differs from a full perimeter plan, and a CL-100 wood infestation report for a sale adds its own inspection area. The homeowner knows the scope and price before agreeing to anything.
It depends on the contract. Clemson advises homeowners under a bond to read the current contract and ask exactly which subterranean termites and which damage are covered.
Clemson notes a bond may need amending or rewriting depending on its terms, so the contract matters more than the sales pitch. Formosan coverage is a common point of confusion, so ask the holding company directly and get the answer in writing.
A technician can inspect and explain what is found, but the bond itself is a contract with the holding company. See termite bonds and annual reinspection for what to check.
Do not dig out, spray or fill a Formosan colony yourself. It is rarely visible, and a product placed in the wrong spot does not reach the feeding. Do not break open mud tubes or pull out wet insulation under the house, and do not sweep up swarmers and assume the problem has left. Call (855) 974-4733 for a technician to inspect before anything is removed.
The caller describes what was seen, because an evening swarm between mid-May and July points toward the Formosan species, while an afternoon swarm in early spring points toward a native one. The call also asks whether the house has a crawl space or a slab, since that changes where the technician looks first.
The technician checks joists, sill plates, piers and soil, focusing on wood that touches the ground or stands in damp. The condition of the vents and the moisture in the crawl space are noted alongside the termite evidence.
Evidence is traced to where the colony feeds and where it reaches the structure. Plumbing penetrations, foundation gaps and the lower parts of exterior walls are common routes, and each is recorded so the treatment covers the whole path.
The technician explains which method fits this house and why. Soil-based work and baiting are different tools, and the choice depends on construction, perimeter access and how much wood is involved. The scope is explained before work starts.
Activity is checked again after treatment, because results are confirmed rather than assumed. The homeowner is told what to watch for between visits, including swarmers and fresh tunnels.
The technician finds feeding in the framing by walking the crawl space and tracing tunnels back toward the soil. Treatment targets the soil feeding the colony and the points where it reaches the structure. Any structural repair is a separate decision for the homeowner and the contractor who does that work.
The technician checks where the swarmers emerged and whether the framing shows any sign of activity. A swarm alone is a reason to inspect, not proof of a large problem, and the inspection decides the next step.
With no sub-floor to walk, the evidence sits at the foundation edge, at slab penetrations and where utility lines cross into the house. The method differs from a crawl-space inspection, as the slab page explains.
Most formosan subterranean termite treatment calls are scheduled the same day when a technician is free, and you approve the price before any work starts.
North Charleston spans Berkeley, Charleston and Dorchester counties, and Clemson lists Formosan termites as established in all three. A homeowner in Hanahan or Goose Creek faces the same species as one in the older parts of the city, even though the houses differ in age.
The housing is the local detail that matters most. Mid-century brick and frame houses on vented crawl spaces are common in West Ashley, James Island, Hanahan and Ladson, where moisture and termites tend to overlap under the floor. The peninsula and sea islands have older raised frame, which gives a different view of the same species.
Evening swarms are a local experience too. Note the time and the light, keep swarmers out of the house, and call. The Formosan termites in Charleston guide covers the species and its season for this area.
Treatment for the native subterranean termite, which swarms in early spring afternoons and works through damp crawl-space framing.
Inspection and treatment for Formosan and native subterranean termites in North Charleston homes, from vented crawl spaces to slab edges.
Why damp vented crawl spaces in North Charleston feed wood decay and termites, and how the sub-floor inspection is scoped.
A termite bond is a contract, and what it covers depends on its wording, especially for Formosan termites.
Not sure if you're covered? Check your ZIP code.
Formosan subterranean termites were introduced into Charleston in the mid-1950s and are now established along the coast.
Native subterranean termites swarm in early spring, usually in the afternoon.
In South Carolina, pest control is licensed by the Department of Pesticide Regulation at Clemson University, not by a standalone licensing board.
Clemson lists the species as established in Berkeley, Charleston and Dorchester counties, the three counties North Charleston spans. Clemson describes the coastal belt from Charleston south to Beaufort as the area of concentration. A technician can confirm activity at a specific house.
Both nest in soil and reach wood from the ground. Native swarms come in early spring, usually in the afternoon, while Formosan swarms come later in the year and in the evening. A technician uses that timing as a starting point, then confirms the species.
Clemson's guidance puts Formosan swarms from mid-May into July, most often in the evening. A local newspaper account put the start in late May, so sources differ on the first date. A swarm outside that window is still worth a call.
A homeowner can see swarmers and damage, but finding the colony is the hard part. Products placed on the surface may not reach the feeding, and digging near the foundation can disturb a colony without ending it. A technician chooses the method for the activity that is present.
This site does not publish prices. The house, its construction and access, the scope and whether a CL-100 report is needed all change the work. A technician confirms the price on site, and it is approved before any work starts.
A bond is a contract with its own terms, so the real question is what the current contract covers. Clemson advises asking the holding company which subterranean termites and which damage are included, because the answer often differs from what people assume.