The short version
Most termite problems in Charleston are eastern subterranean termites, and the usual fix is a liquid soil treatment or bait stations. Start with an inspection; $75–$250 is typical.
- Look for mud tubes, shed wings and hollow-sounding wood.
- Swarms usually show up from March through May.
- The usual fix is a soil barrier or bait stations.
- An inspection typically costs $75–$250.
- Insurance usually doesn’t cover termite damage.
Homeowners, landlords and anyone buying or selling a house in Charleston, whether you've spotted something or just want to know what to watch for.
What to look for
Spongy floors or bubbling paint usually mean long-running damage. So it's worth an inspection, even for one or two signs. Termites work quietly. A colony can feed inside a wall for years. Average winter lows near 39°F slow termites near the surface around Charleston, but they move deeper and keep feeding under heated homes.
- 1Screwdriver sinks easily into sills or trim.
- 2Blistered or bubbling paint on wood surfaces.
- 3Crumbling baseboards behind furniture.
- 4Discarded wings caught in spider webs.
- 5Mud tubes running up foundation walls or piers.
- 6Live pale insects inside a broken mud tube.
Why it’s worth acting soon
- Colonies grow and spread every year they go untreated.
- Damage hides behind drywall, flooring and trim.
- Homeowners insurance usually doesn’t cover termite damage.
- An active infestation can complicate a home sale.
- Formosan colonies are large and can do serious damage quickly.
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Termite activity through the year in Charleston
Spring
swarm season. In Charleston, expect it from March through May. Check windowsills and light fixtures for wings.
Summer
with highs around 90°F in Charleston, termites follow moisture, so watch AC drain lines, sprinkler zones and hose bibs.
Fall
with about 51 inches of rain a year in Charleston, make sure gutters and downspouts carry water well away from the foundation.
Winter
a good time to book an inspection in Charleston, before swarm season starts.
Treatment options and typical costs
Termite Inspection and WDI Report
$75–$250
The inspector checks the foundation, garage, attic and damp spots. Bring up anything you’ve noticed.
- Time
- 60–120 minutes
- Best for
- Every job, real estate closings, and yearly peace of mind
Bait Station System with Monitoring
$1,500–$3,500 install, plus $300–$500 per year
Each station holds cellulose bait laced with a chitin synthesis inhibitor. Workers around a Charleston home share it, cannot molt, and the colony dies over weeks to months.
- Time
- 2–4 hours to install; checked quarterly
- Best for
- Colony elimination, wells and slabs, homes near water
Annual Renewal and Monitoring
$150–$400 per year
Bait systems require monitoring to keep working. A Charleston pro checks each station, replaces consumed bait, and notes any new activity around the house.
- Time
- 30–60 minutes per visit
- Best for
- Keeping a treated home protected after the initial job
Fumigation for Drywood Termites
$1,200–$4,000 (often $1–$4 per square foot)
Tenting is mainly for drywood termites. Most homes here never need it.
- Time
- 2–3 days including tenting and aeration
- Best for
- Widespread drywood termites throughout a structure
Prices are typical published ranges. Ask what’s included before you compare quotes.
A slow leak under a sink keeps the wood damp, and damp wood is exactly what termites are looking for.How treatment works on a typical Charleston home.
They also treat around piers and plumbing. Fix any moisture under the house too. Bait stations are the other main option. They're spaced every 10 to 20 feet. Termites carry the bait back to the colony. The stations are checked on a schedule, often every few months. With a crawl space, the crew treats soil outside and underneath.
Which termites live around Charleston.
The termite you're most likely to meet in Charleston is the eastern subterranean termite. It nests in soil and builds mud tubes to reach wood. It needs steady moisture. Formosan termites have spread into parts of South Carolina too. Their colonies dwarf native ones. Inspectors take them seriously.
Subterranean termites don't stop in winter; they just go deeper. A quiet season is a good time for a non-urgent inspection.When termites swarm here.
A swarm inside usually means it's in the house. Save a few in a bag, or snap a clear photo. Swarm season is when termites show themselves. In Charleston, eastern subterranean termites usually swarm from March through May, typically on a warm, sunny day after rain. Formosan termites in South Carolina swarm later, from late April into June. Look for them on warm, humid evenings around porch lights. A swarm outside means a colony is nearby.
Where to look around your house.
Standing water or a musty smell needs fixing either way. The same advice applies across the area, from Charleston out to North Charleston and Mount Pleasant. A lot of houses around Charleston are built over crawl spaces, and that's usually where termites start. Take a flashlight underneath. Check the piers, the sill plate and the floor joists.
A year of termites in Charleston.
- Summer: with highs around 90°F in Charleston, termites follow moisture, so watch AC drain lines, sprinkler zones and hose bibs. - Fall: with about 51 inches of rain a year in Charleston, make sure gutters and downspouts carry water well away from the foundation. - Winter: a good time to book an inspection in Charleston, before swarm season starts. - Spring: swarm season. In Charleston, expect it from March through May. Check windowsills and light fixtures for wings.
What happens at an inspection.
They'll also go into the crawl space. A moisture meter and a probe help them find hidden activity. Afterward, ask them to show you what they found. Photos help. Most inspections take an hour or two. The inspector walks the outside of the house first. They check the foundation, the soil line and nearby wood. Inside, they check the garage, baseboards, plumbing gaps and the attic.
Termites or ants?
- Antennae: termite antennae are straight. Ant antennae bend like an elbow. - Debris: termites leave mud. Carpenter ants leave sawdust. - Tunnels: termite galleries are packed with mud. Ant tunnels are clean and smooth. - Wings: termite wings are all the same length. Ant wings aren’t. - Waist: termites are thick through the middle. Ants are pinched.
Getting ready for treatment day.
Clear a path along the outside walls. Move stored boxes away from garage walls. Mark sprinkler heads and any buried lines. Keep pets and kids inside while the crew works outside. Ask how long to stay off treated soil. Any drill holes in a slab or patio get patched. Soil treatments and bait stations need little prep.
Mulch and termites.
Wood chips right against siding hold moisture termites like. Keep mulch thin and pull it back from the foundation. A dry strip along the house lets you spot mud tubes.
Questions to ask before you sign.
- Is the whole foundation treated, or just one spot? - What does the warranty cover, and for how long? - What does the yearly renewal cost? - What do I need to do before and after treatment? - Which termites did you find, and where? - What product or system will you use?
What affects the price
- Wells, drains, or water features limiting chemical use.
- Species: subterranean, drywood, or Formosan.
- Linear feet of foundation to be treated.
- Extent of existing damage needing repair.
- Liquid barrier versus bait station system.
- Local labor rates and licensing requirements.
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What's your biggest concern about termites?
When to call for help
Call if you see mud tubes, pellets or an indoor swarm. Hollow-sounding wood is another clue. Buying or selling? Get a wood-destroying insect (WDI) report either way. Lenders often ask for one. It's also the cheapest termite service. Carpenter ants leave clean tunnels and sawdust. Termites leave mud.
What you can do yourself
Some of the work is yours. Pull mulch back from the foundation. Fix leaks and clear gutters. Keep firewood away from the house. Treating an active colony is harder. The product has to reach the whole colony. It also needs even coverage around the entire foundation. Store-bought sprays usually kill only the termites you see.
Termites in Charleston
A typical home in Charleston is worth around $520k, which puts a few hundred dollars for an inspection and prevention in perspective. Charleston has a humid subtropical climate, and termites activity here tends to pick up spring swarm season (March-May), warmer earlier in the south. In Charleston, most of the housing is urban, so the usual entry points, moisture spots, and sheltered areas near the structure are what an inspection checks first. In Charleston, take a minute to note where you have seen activity and when it appears, so the inspection is faster and the quote more accurate. A local provider who knows Charleston and South Carolina can point out the specific conditions that matter most here before you commit to a plan. Charleston gets about 51 inches of rain a year, and average humidity sits near 73%, so the soil around foundations rarely dries out. South Carolina is one of the most termite-active states in the country. An annual inspection is common sense here. With summer highs around 90°F, Charleston's humid subtropical climate decides when local termites are busiest.
Local research
Termites in Charleston, SC: what the public record shows
Before you compare quotes, it helps to know which termites actually live in South Carolina, when they are busiest around Charleston, and what the state figures look like. Everything below links to the agency or university page it came from.
Termite species recorded in South Carolina
Four drywood and four subterranean species mean coastal SC homes can face both soil-borne and wood-borne infestations.
Clemson Home & Garden Information CenterTermite species recorded in South Carolina
- Eastern subterranean termite (Reticulitermes flavipes) — UGA calls it 'the most widely distributed subterranean termite, and it is the most common termite found in the eastern United States'; it swarms February through April in Georgi…
- Formosan subterranean termite (Coptotermes formosanus) — FDACS lists it in Florida, Alabama, Georgia, Louisiana, Mississippi, South Carolina, North Carolina, Tennessee, Virginia, Texas, Arizona, California and Hawaii. Colonies contain…
- West Indian drywood termite (Cryptotermes brevis) — UF/IFAS lists it among the major structural pest species accounting for roughly 65% of Florida termite reports. Clemson records the 'powderpost' drywood termite in seven South C…
- Western drywood termite (Incisitermes minor) — UC IPM: 'California's second most important termite pest', 'commonly found along the Pacific coastal region extending into the Central Valley and deserts of Southern California'…
When termites are busiest around Charleston
Native subterranean species swarm in early spring, often in the afternoon; Formosan swarms mid-May to July, often in the evening, attracted to lights (Clemson).
Clemson: Formosan termites established in Aiken, Bamberg, Beaufort, Berkeley, Charleston, Colleton, Dorchester, Georgetown, Horry, Jasper, Lexington, Orangeburg, Pickens, Richland, Sumter, and York counties; Formosan colonies 'may have a million or more' workers vs. about 100,000 for natives. Eastern drywood termites found in six coastal counties; powderpost (West Indian) drywood termite in seven counties.
Sources: Clemson Home & Garden Information Center; Biology of Subterranean Termites in the Eastern United States (B1209); University of Missouri Extension; Formosan Termite Program; Termite Species Distribution in Florida and UF Termite Identification Services (IN1360); Drywood Termites (Pest Notes). Figures are quoted as the source prints them. How we check our sources
Simple ways to keep termites away
- Inspect used furniture for drywood pellets before bringing indoors.
- Keep six inches between soil and siding or wood.
- Keep gutters clean so water does not pool.
- Repair rotting trim, fascia, and window frames.
- Set deck and porch posts on concrete, not soil.
- Screen attic and foundation vents with fine mesh.
Compare quotes line by line: the areas treated, the product, the warranty and the renewal fee. The lowest total isn't always the best deal.Did you know?
In Charleston, when danger shows up, soldier termites bang their heads against the tunnel walls to warn the colony.
In Charleston, termites are closer cousins to cockroaches than to ants, despite the old nickname white ants.
Questions people ask
How do I know if I have termites or flying ants?
Ants have a pinched waist; termites don't. Save one in a bag for the inspector. Check the wings and the waist. Termite wings are all the same length.
What does a WDI report include?
It also notes conditions that invite them, like wood touching soil. It only covers areas the inspector could reach. It lists any termites or damage found.
Do I need a termite inspection when buying a house?
Either way, it's cheap peace of mind. Ask your agent when it's due. Usually, yes. Many lenders ask for a wood-destroying insect (WDI) report.
How long does termite treatment take?
Bait stations take a few hours to install. Fumigation takes two to three days. A liquid barrier takes half a day to a day.
Are mud tubes always a sign of active termites?
Break off a piece and check back in a week. If it's rebuilt, they're active. Not always. Old tubes can stay on a wall for years.
Are termite baits or liquid treatments more common?
In Charleston, termites are best caught early through inspection, because the damage is hidden inside wood until it is far along. In Charleston, a professional inspection looks for mud tubes, damaged wood, and swarming activity, and treatment targets the soil and the colony rather than just the visible wood.
Are termites common in South Carolina?
Around Charleston, the usual culprit is the eastern subterranean termite.
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Sources (11)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Termite Exterminator · Updated September 11, 2026 · How we write these guides