There’s a house I walked through in Beaufort a few years back — good bones, nice light off the water, priced to move. The listing agent mentioned the inspection had flagged “minor wood damage, seller-disclosed.” I lifted a windowsill trim piece that was barely attached and a small pile of what looked like coffee grounds fell out onto the floor. Not coffee grounds. Frass. Drywood termite frass. By the end of that afternoon, we’d found five active sites in the upper framing and two more in a closet shelf that had basically turned into a wooden sponge. The buyer walked. The seller spent the next several months and a lot of money learning a lesson I’m going to try to save you.
Drywood termites are not the same animal as the subterranean termites most people have heard of. Understanding that distinction isn’t just trivia — it changes everything about how you detect them, treat them, and price a property that has them.
What Makes Drywood Termites Different
Subterranean termites need soil contact. They travel through mud tubes, they need moisture, and they build their colonies underground. You can spot their tubes on a foundation wall if you know what you’re looking for.
Drywood termites don’t need any of that. They live entirely inside the wood — no soil contact, no mud tubes, no external moisture source required. A colony can survive indefinitely inside a single piece of framing or a window frame or a piece of furniture you moved in from another house. They eat across the grain of the wood, hollowing out chambers, and they push their waste — those small pellets, the frass — out through tiny kick-out holes called “kick holes.”
That frass is the main thing you’ll find. It looks like sawdust but rounder, almost like mustard seeds or very fine sand. If you find a small pile of it on a windowsill, a shelf, or on the floor below a ceiling beam, don’t sweep it up and move on. Mark the spot and get an inspection.
The Carolina coast from the Grand Strand up through the Outer Banks is warm and humid enough that drywood termites are a year-round concern, not a seasonal one. Older homes in historic districts — think Beaufort’s Front Street corridor or the cottage neighborhoods around Southport’s downtown — have decades of accumulated wood that these insects find very comfortable.
Why Coastal Homes Are Especially Vulnerable
Heat and humidity are the obvious factors. But there are a few specific coastal-home features that raise the exposure:
- Unventilated or poorly ventilated attics. Hot, still air lets moisture accumulate in attic framing even without a roof leak. Drywood termites can establish colonies in attic structural members for years before anyone notices.
- Boat access and seasonal rentals. I’ve seen drywood termite colonies traced back to a piece of furniture or built-in cabinetry brought in from another state. Short-term rental turnover means furniture moves frequently, and fumigated items that aren’t properly cleared can reintroduce an infestation.
- Older hardwood trim and millwork. The kind of thick-cut pine trim you find in pre-1950 coastal cottages is exactly what drywood termites prefer. It’s dense, it’s dry, and it’s been there long enough to invite multiple generations.
- Cedar shake siding and wood fascia boards. These are exposed, rarely inspected from the inside, and sit right where the structure meets the weather.
A home inspection from a generalist inspector is not enough here. You need a licensed wood-destroying organism (WDO) inspector — a separate credential in both North Carolina and South Carolina, last I checked — and ideally one who works in the specific submarket where the property sits. Local experience matters because regional termite pressure varies even along a single stretch of coastline.
What a Real Inspection Looks Like
A thorough WDO inspection for drywood termites should cover areas that don’t always make it onto a standard home inspection checklist.
The places inspectors should probe
- Attic framing, especially rafters and ridge boards
- All window frames and door frames — exterior ones first, then interior
- Fascia boards and soffit material, particularly on the sun-side elevations
- Closet shelving and built-in furniture (these are often overlooked)
- Subfloor framing in any crawlspace, even if the main concern is identified as a drywood species rather than a subterranean one
- Any decorative wood ceiling elements — exposed beams, tongue-and-groove paneling
Ask the inspector to probe with a pick or a blade in any area where they find frass or suspect activity. Visually intact wood can be structurally compromised already. I’ve tapped a ceiling beam that sounded hollow through half its length with no surface indication at all.
Get the report in writing — every location, every species identification if possible, every recommendation. A verbal “it looks okay in most places” is not a document you can use at closing or with an insurance carrier.
The Cost Question — and Why It’s Hard to Answer Early
Treatment costs for drywood termites range considerably depending on the method and the extent of infestation. Spot treatment — injecting individual infestation sites with chemical or heat — runs somewhere in the low hundreds to mid-hundreds per treatment area, last I checked, but it only works when the colony is fully localized and accessible. If the infestation has spread through structural framing, you’re looking at whole-structure fumigation, which for a typical coastal cottage in the 1,500–2,500 square foot range has run anywhere from $1,500 to $4,000 or more depending on the tent size and the local market. Those numbers move — get current quotes from two or three licensed operators in the county where the property sits.
Structural repair is a separate line entirely. Replacing compromised framing, window units, or fascia boards after treatment can double or triple the total remediation cost on a property that’s been quietly infested for several seasons.
The price negotiation question — whether to ask the seller to remediate before closing or take a price reduction and handle it yourself — deserves its own entry, and I’ll cover that alongside re-inspection timing and disclosure requirements in part two.
What to Do Before Your Next Showing
If you’re actively shopping coastal properties in the Carolinas, add this to your pre-showing habit right now: when you walk through a house, run your fingers along windowsill trim pieces and look at the floors directly below window frames, built-ins, and exposed ceiling elements. You’re looking for that fine, granular frass. You’re also listening — tap wooden trim and structural members with your knuckles. A hollow, papery return where you’d expect a solid thud is a flag worth following up on.
Don’t wait for the inspection period to think about wood-destroying organisms. Come to the showing already paying attention, so you know whether you’re dealing with minor spot-treatment territory or something that might restructure the whole negotiation.
The water and the weather get a lot of attention in coastal real estate, and for good reason — take a look at what sustained environmental pressure does to a community’s infrastructure in pieces like the Dare Waterways Commission’s navigation alarm. But the damage happening inside your walls on a dry Tuesday in October doesn’t make the news. It just keeps going until someone looks.