The swarm calendar that catches Raleigh homeowners out
Most people expect termite swarms in a single spring week. NC State describes something longer: native species in North Carolina start swarming in late winter and keep going into September or October, generally during daylight on warm days after rain. Three native species with staggered seasons make that spread possible, and a mild February in Raleigh can produce a flight before anyone is thinking about termites. The practical use of this is diagnosis. A daytime flight at an interior window after a rainy stretch is the classic native subterranean pattern, and it means a colony is in contact with the structure rather than out in the yard. A flight after dark around exterior lights in late spring or early summer suggests Formosan activity, which agriculture sources in Florida and Georgia have documented in North Carolina. Because the season is long, the absence of swarmers proves very little. Colonies feed year round in this climate, and an August with no flights says nothing about what is happening beneath a crawl space floor.
What the WDIR report actually covers
North Carolina sales run on a specific document, and knowing its limits saves arguments later. The Official Wood-Destroying Insect Information Report, commonly called the WDIR 100, is the only legal form for the purpose, it is required on almost every residential structure sold in the state, and it has to come from a licensee of the NCDA and CS Structural Pest Control Division. The report describes visible evidence of wood-destroying insects on the day of inspection. It is not a warranty, it is not a promise about hidden framing, and it does not cover areas the inspector could not physically reach. Those exclusions are listed on the form, which is why they are worth reading before you rely on a clean summary line. If you are selling in Raleigh, clear access ahead of the visit. Move storage away from crawl space entries, unblock the perimeter inside a basement, and trim shrubs off the foundation. Every area an inspector cannot examine becomes a note on the form and a question from the buyer.
Reading a quote using the application rate
Termite quotes are hard to compare because they rarely describe the same amount of work. One number makes it easier. NC State gives a typical soil application rate of 4 gallons per 10 linear feet for each foot of footer depth, which turns treatment into arithmetic rather than opinion. Measure the perimeter of your house and ask each company two questions: how many linear feet they plan to treat, and what footer depth they are working to. Multiply and you have a rough expectation for gallons of finished solution. A bid that is dramatically cheaper than the others is usually saving money on one of those inputs, on the drilling, or on both. Also ask what is being drilled. Where activity is known, state rules referenced by NC State call for attached slabs and voids to be drilled and treated, so porches, stoops, and garage slabs should appear in the proposal. The company that explains its footage, depth, gallons, and drill points is describing a job you can hold them to.
Crawl spaces, the Triangle's weak point
A large share of houses in this area sit over crawl spaces, and that is where most local termite stories start. Warm, humid air moves under the floor, the ground gives up moisture, and the framing above it stays at a moisture level that suits both termites and decay fungi. With 46 inches of rain and 71 percent average humidity, drying happens slowly. An inspector working a crawl space should be probing rather than glancing: sill plates on the block wall, band joists, floor joists near plumbing, piers, and the subfloor under bathrooms. Mud tubes on piers are the clearest indicator, but activity can also arrive through the block wall itself and never show on the outside. The fixes are unglamorous and effective. A continuous vapor barrier over the soil, repaired plumbing drips, functioning drainage outside, and adequate ventilation or a properly sealed and conditioned space all lower the moisture that keeps this cycle running. Do that work and both the treatment and the framing last longer.
How much damage a colony can do before you see it
Termite damage is slow and hidden, which is what makes it expensive. Texas A and M reports a mature native subterranean colony can hold as many as 250,000 workers, and those workers hollow wood from the inside while leaving a thin outer shell and the paint film intact. A door casing can look perfect and collapse under a thumb. The scale of the problem nationally reflects that pattern. The University of Georgia estimates subterranean termite treatment and prevention runs about 2 billion dollars a year in the United States, and the University of Missouri puts control plus repair near 4.5 billion. The gap between those figures is essentially carpentry. For a Raleigh homeowner the lesson is timing rather than panic. An annual look at the foundation and crawl space, done in late winter before the earliest native flights, keeps a finding in the treatment column rather than the repair column. Once a floor sags or a sill plate crumbles, the pest work becomes the cheaper half of the project.