Drywood termites live inside dry wood above ground and need no contact with soil, while subterranean termites nest in the soil and build mud tubes to reach wood. Subterranean termites cause far more structural damage and require soil-based treatments, whereas drywood infestations are often spot-treated or fumigated.
Spotting termites is alarming. Knowing which kind you’re dealing with is what actually saves your home. The two species most likely to invade a house—drywood and subterranean termites—look similar at a glance, but they live, feed, and destroy in completely different ways. Treating one as if it were the other wastes money and leaves the real problem chewing away behind your walls.
This guide breaks down the key differences between drywood and subterranean termites: where they live, how they behave, the damage they leave behind, and the warning signs that give them away. By the end, you’ll understand which species you’re facing and what kind of professional help makes sense for your situation.
What’s the main difference between drywood and subterranean termites?
The single biggest difference comes down to one thing: soil.
Subterranean termites need moisture from the ground to survive. They build their colonies underground and travel up to wood through mud tubes, which protect them from drying out and from predators. Cut off their access to soil moisture, and the colony dies.
Drywood termites don’t need soil at all. They live entirely inside the wood they eat, drawing moisture from the timber itself. A colony can survive in a single wooden beam, a piece of furniture, or a window frame without ever touching the ground.
This one distinction shapes everything else—where you’ll find them, how fast they spread, and how a professional will treat them.
Where do drywood and subterranean termites live?
Habitat is the clearest way to tell these two species apart.
Subterranean termites nest in the soil, often several feet underground. Their colonies are massive, sometimes containing hundreds of thousands to millions of members. They forage outward and upward, building mud tubes along foundations, walls, and crawl spaces to reach the wood in your home. You’ll typically find them in areas with high moisture, such as basements, crawl spaces, and around leaky plumbing.
Drywood termites live above ground, inside the wood itself. Their colonies are much smaller—usually a few thousand members—and they often go after dry, sound timber. Attic framing, hardwood floors, door frames, and even wooden furniture are common targets. Because they don’t rely on soil contact, drywood termites can infest the upper floors of a building, which subterranean termites rarely reach.
How do their colonies and behavior differ?
Colony size and structure tell two very different stories.
Subterranean colonies are enormous and highly organized, with distinct worker, soldier, and reproductive castes. Their sheer numbers explain why they can do so much damage so quickly. A large colony can consume wood at a steady, relentless pace.
Drywood colonies grow slowly. They mature over years rather than months, and their smaller size means damage accumulates more gradually. That slower pace is a double-edged sword: the destruction is less rapid, but infestations often go unnoticed for a long time because the colony stays hidden inside the wood.
Both species swarm to reproduce, releasing winged adults called alates. Subterranean termites usually swarm in spring, often after rain. Drywood termites tend to swarm in late summer or fall, though timing varies by region and climate.
How does the damage compare?
Both species damage wood, but the patterns look different on inspection.
Subterranean termites eat along the grain of the wood, following the softer spring growth. This leaves a layered, honeycomb-like pattern, and their galleries are typically lined with soil and mud. Damaged wood often looks dirty inside. Because their colonies are so large, subterranean termites are responsible for the majority of termite-related structural damage to homes.
Drywood termites cut across the grain, creating smooth, clean galleries with no soil inside. A telltale sign is their fecal pellets, known as frass—tiny, dry, six-sided pellets that they push out of small “kick-out” holes in the wood. Piles of frass that resemble coarse sawdust or coffee grounds are a strong indicator of a drywood infestation.
What are the warning signs of each type?
Knowing the signs helps you catch an infestation early.
Signs of subterranean termites:
- Mud tubes running along foundations, walls, or crawl spaces
- Wood that sounds hollow when tapped
- Buckling paint or swollen floors that look like water damage
- Discarded wings near windows and doors after a spring swarm
Signs of drywood termites:
- Piles of frass (small, dry pellets) beneath wooden surfaces
- Tiny kick-out holes in wood
- Hollow-sounding or blistered wood
- Discarded wings, often appearing in late summer or fall
If you see mud tubes, you’re almost certainly dealing with subterranean termites. If you find piles of dry pellets with no soil involved, drywood termites are the likely culprit.
How are the two types treated differently?
Treatment depends entirely on biology, which is why correct identification matters so much.
Subterranean termites are usually treated by targeting the soil-to-wood connection. Common approaches include liquid termiticide barriers applied around the foundation and bait stations placed in the ground to eliminate the colony at its source. Because the colony lives in the soil, the goal is to interrupt or destroy the nest beneath and around the structure.
Drywood termites are treated where they live—inside the wood. For localized infestations, spot treatments such as injecting termiticide directly into the galleries can work well. For widespread infestations, whole-structure fumigation (tenting) is often the most reliable option, since it reaches colonies hidden throughout the building.
Choose a soil-focused treatment plan if you have subterranean termites and structural protection is the priority. Choose targeted wood treatment or fumigation if a licensed inspector confirms drywood termites. In either case, a professional inspection is the safest way to confirm the species before spending money on treatment.
Which termite is more dangerous to your home?
Subterranean termites are generally considered the more destructive of the two. Their massive colonies and rapid feeding mean they can compromise structural wood faster than any other termite type. They are the leading cause of termite damage to homes in many regions.
Drywood termites are slower and their colonies are smaller, but they shouldn’t be underestimated. Because they hide inside wood and spread without soil contact, they can quietly damage furniture, framing, and flooring across multiple areas of a house before anyone notices.
The bottom line: both species cause serious damage, but subterranean termites tend to do it faster and on a larger scale.
Protect your home with the right diagnosis
The difference between drywood and subterranean termites isn’t just academic—it determines whether a treatment will actually work. Subterranean termites attack from the soil and demand a ground-focused defense. Drywood termites live inside the wood and call for targeted or whole-structure treatment. Misidentify the species, and you risk paying for a solution that never touches the real colony.
If you’ve spotted mud tubes, frass, discarded wings, or hollow-sounding wood, your safest next step is a professional inspection. A licensed pest control expert can confirm the species, map the extent of the infestation, and recommend the treatment that fits your home. Acting early limits the damage and protects your biggest investment.
Frequently asked questions
How can I tell if I have drywood or subterranean termites?
Look for mud tubes and soil-filled galleries, which point to subterranean termites. Piles of small, dry fecal pellets (frass) and clean galleries with no soil suggest drywood termites. A professional inspection confirms the species for certain.
Which termites cause the most damage to homes?
Subterranean termites cause the most damage because their colonies can number in the hundreds of thousands to millions and they feed continuously. They are the leading cause of structural termite damage in many areas.
Can a house have both types of termites at the same time?
Yes. It’s possible for a home to host both drywood and subterranean termites, especially in regions where both species are common. This is one reason a professional inspection is valuable—it identifies every active infestation.
Do drywood termites need soil contact like subterranean termites?
No. Drywood termites live entirely inside wood and get moisture from the timber, so they don’t need soil contact. Subterranean termites, by contrast, rely on soil moisture and build mud tubes to reach wood.
When do termites swarm?
Subterranean termites typically swarm in spring, often after rainfall. Drywood termites usually swarm in late summer or fall. Seeing discarded wings near windows and doors is a common sign that a swarm has occurred.
Should I treat termites myself or hire a professional?
Termite control is best handled by a licensed professional. Correct identification, accurate treatment, and follow-up monitoring require specialized tools and experience. DIY methods often miss the colony and allow damage to continue.