Effective home termite control combines prevention, early detection, and targeted treatment. Termites cause an average of $3,000 in repair costs per homeowner, but catching an infestation early or preventing one entirely can keep that number close to zero. The approach you need depends on which type of termite you’re dealing with and how far the problem has progressed.
Know Which Termite You’re Dealing With
The two most common types in residential homes are subterranean and drywood termites, and they behave differently enough that the control strategy for one won’t necessarily work for the other.
Subterranean termites live in the soil and build mud tubes (pencil-width tunnels made of soil and excrement) to reach the wood in your home. They need constant moisture, which is why they maintain contact with the ground. These termites are found in almost every state except Alaska, and they eat along the wood grain, leaving mud or soil inside their feeding tunnels. If you see mud tubes running up your foundation walls, you’re looking at a subterranean infestation.
Drywood termites nest inside the wood itself and don’t need soil contact at all. They’re most common in coastal areas of Florida, California, and Texas. The telltale sign is small, hard fecal pellets that accumulate near infested wood and look like sawdust or coarse sand. Drywood termites eat across the grain and create hidden galleries that can weaken a structure from the inside with no visible external damage for months or years.
Prevention Starts With Moisture and Clearance
Since subterranean termites depend on moisture, reducing water near your foundation is one of the most effective things you can do. Make sure gutters, downspouts, and splash blocks direct water away from the house. Fix leaking faucets, pipes, and air conditioning units. The ground next to your foundation should slope away from the building so surface water doesn’t pool. If your lawn sprinklers spray near the foundation, reposition them.
Wood siding, door frames, and window frames should sit at least six inches above ground level. If soil or mulch has built up against your siding over the years, pull it back. Cut the bottom off wood latticework that touches the ground, and set wooden steps or posts on concrete bases rather than directly in soil. Where you use mulch, keep it to a couple of inches deep and never let it contact wood siding or framing.
If your home has a crawlspace, ventilation matters. Building codes typically call for one square foot of vent opening per 150 square feet of crawlspace. Adding a polyethylene vapor barrier (4 to 6 mil thickness) over about 75 percent of the soil surface reduces humidity significantly and can allow you to use fewer vents. Keep existing vents clear of leaves, dirt, and vegetation.
DIY Options and Their Limits
For prevention and very early-stage problems, homeowners have a few tools available. Borate-based wood treatments are among the most accessible. These products penetrate wood and make it toxic to termites that try to feed on it. You can brush or spray borate solutions onto exposed, unfinished wood in attics, crawlspaces, and garages. The catch is that borates only protect wood they’ve actually penetrated, so they work best as a preventive measure on accessible framing rather than as a cure for an active infestation buried inside walls.
Retail termite baiting stations are another option. These are plastic stations buried around your home’s perimeter that contain wood or cellulose laced with a slow-acting toxin. Foraging termites carry the toxin back to the colony. Bait systems require patience and consistent monitoring. You need to check stations regularly and replace bait cartridges, which makes them more of an ongoing commitment than a one-time fix.
For drywood termites limited to a small, accessible area, spot treatments involving injection of insecticidal foam or liquid into drilled holes can reach galleries inside the wood. The standard technique involves drilling holes in a diamond pattern about 18 inches apart, finding a gallery, and injecting product directly into it. This works when you can pinpoint the infestation, but drywood termites often have multiple colony pockets hidden throughout a structure, and missing even one means the damage continues.
When Professional Treatment Makes Sense
If you find mud tubes, hollow-sounding wood, or piles of fecal pellets, the infestation has likely been active for months. At that point, professional treatment is worth the investment because the tools and techniques available to licensed operators are substantially more effective than retail products.
For subterranean termites, the standard professional approach is a liquid soil barrier treatment. A termiticide is diluted in water and applied to the soil around and under your foundation, creating a continuous treated zone that kills termites tunneling through it. This involves trenching along the foundation and sometimes drilling through concrete slabs to reach soil underneath. A quality soil treatment can provide protection for 8 to 12 years or longer. Most homeowners pay between $200 and $900 for a standard perimeter treatment on a typical single-family home, though larger properties or homes with extensive concrete can push the cost to $1,500 to $2,500.
Professional baiting systems are more sophisticated than retail versions and include regular monitoring by a technician. Installation typically runs $800 to $3,000 depending on how many stations your property needs, plus ongoing monitoring costs of around $400 per year.
For widespread drywood infestations, tent fumigation is sometimes the only reliable option. The entire structure is sealed under a tent and filled with gas that penetrates every piece of wood, reaching colonies that no spot treatment could find. Fumigation typically costs $1,200 to $2,500 or more, and you’ll need to vacate the home for two to three days.
Inspection: The Most Cost-Effective Step
Regular inspections are the single best way to keep termite costs low. Termites work slowly enough that an annual professional inspection can catch damage while it’s still in the $250 to $1,000 repair range rather than the $3,000 to $10,000 range. Medium-scale damage to walls, flooring, or framing typically costs $1,000 to $3,000 to fix. Replacing a rotted structural beam runs $1,500 to $5,000 per beam, and full wood siding replacement on a badly damaged home can reach $37,500.
You can also do your own informal checks between professional visits. Once or twice a season, walk your foundation perimeter and look for mud tubes, especially after rain. Tap exposed wood in your basement, crawlspace, and garage with a screwdriver handle and listen for a hollow sound. Check for new cracks in drywall or paint that bubbles for no apparent reason. In spring, watch for swarms of winged insects near windows or light fixtures, which are reproductive termites leaving to start new colonies.
Matching Your Strategy to Your Risk Level
If you live in a northern state with cold winters, subterranean termites are your primary concern, and a solid prevention routine (moisture management, foundation clearance, annual inspections) may be all you ever need. In the Southeast, Gulf Coast, or Southern California, termite pressure is year-round and more intense. Homes in these regions benefit from a professional soil barrier treatment as a baseline, even before any signs of activity appear.
Homes with crawlspaces, older construction, or lots of wood-to-soil contact are at higher risk than slab-on-grade homes with minimal exterior wood. If your home has had termites before, the odds of reinfestation are higher, and a monitoring plan with baiting stations or annual professional inspections becomes especially important. The cost of prevention and early detection is a fraction of what structural repairs run once termites have had a year or two to work undetected.