10 Signs of Termites Every Homeowner Should Know

Termites are sometimes called “silent destroyers” for a reason: they can chew through the wooden structure of your home for months or even years before you notice anything wrong. By the time the damage is obvious, repairs can run into the thousands of dollars. The good news is that termites almost always leave clues behind. If you know what to look for, you can catch an infestation early and protect your biggest investment. Below are 10 signs of termites every homeowner should recognize, plus what to do the moment you spot them.

First, know your enemy: the two main termite types

Most U.S. homes face one of two kinds of termites, and the warning signs differ slightly between them.

• Subterranean termites live in the soil and build mud tubes to reach the wood in your home. They are the most common and most destructive type, found in nearly every state. Moisture is their lifeline.
• Drywood termites live entirely inside the wood they eat and do not need contact with soil. They are common in warmer coastal regions and leave behind distinctive piles of droppings called frass.

Knowing which type you may have helps a professional choose the right treatment. But for spotting trouble, the signs below cover both.

10 warning signs of termites

1. Mud tubes on walls or the foundation

Pencil-width tubes of dried mud running up your foundation, crawl space piers, or basement walls are the classic calling card of subterranean termites. They build these tunnels to travel between the soil and your wood while staying protected from dry air. Break one open: if it is rebuilt within a few days, the colony is active. Mud tubes are one of the most reliable answers to the question “do I have termites?”

2. Hollow-sounding or damaged wood

Termites eat wood from the inside out, leaving a thin shell behind. Tap suspect baseboards, door frames, or studs with a screwdriver handle. A hollow, papery sound means the inside may be gone. If the screwdriver punches through easily, you have found active or past damage.

3. Discarded wings near windows and doors

After termites swarm to start new colonies, they shed their wings. Finding small piles of identical, translucent wings on windowsills, in spider webs, or near light fixtures is a strong sign that a colony is nearby. Unlike ant wings, termite wings are all the same size.

4. Frass (termite droppings)

Drywood termites push their droppings out of tiny “kick-out” holes, creating small mounds of frass that look like coffee grounds, sawdust, or salt and pepper. You will often find these piles on windowsills or floors directly beneath the infested wood. A reappearing pile after you sweep it away points to an active infestation.

5. Swarmers (flying termites)

Swarmers are the winged reproductive termites that emerge, usually in spring, to mate and form new colonies. Seeing them inside your home, around windows, or pouring from a wall is a red flag that a mature colony is already established on or near your property. Outdoors they are easy to confuse with flying ants, so save a few in a bag for an expert to identify.

6. Bubbling, peeling, or blistering paint

As termites tunnel just beneath a painted surface, they introduce moisture and air, causing paint to bubble, blister, or peel. It can look like simple water damage, which is exactly why it gets overlooked. If you cannot trace the bubbling to a leak, termites are a real possibility.

7. Sagging or buckling floors

When termites hollow out subfloor joists and support beams, floors can begin to sag, dip, or feel spongy underfoot. Laminate and hardwood may buckle as if exposed to water. Sagging floors usually mean the infestation has been at work for a while and structural members are involved.

8. Tight or sticking windows and doors

Doors and windows that suddenly stick, jam, or feel hard to open can be more than humidity. As termites eat through frames and the moisture from their activity warps the wood, openings shift out of square. If a window that always worked fine now resists, add it to your list of suspicious signs.

9. Quiet clicking or rustling sounds

Soldier termites bang their heads against the wood and shake their bodies to signal danger, producing a faint clicking sound inside walls. Worker termites are noisy eaters too. Press your ear to an infested wall and you may hear quiet rustling or munching, especially at night when the house is silent.

10. Mud or dirt packed into wood joints

Subterranean termites carry soil into the galleries they excavate, so you may notice mud packed into the seams and joints of wood, between deck boards, or in the cracks of trim. This caked dirt where it does not belong is another telltale sign of an active subterranean colony making itself at home.

How termite damage progresses

Termite damage is gradual but relentless. A new colony may go unnoticed for the first year or two while it grows and stays hidden in framing you never see. As the colony matures into the tens or hundreds of thousands of workers, it consumes wood faster, moving from non-structural trim into joists, studs, and load-bearing beams. Left untreated, an infestation can compromise the structural integrity of a home in a few years. Because the worst damage happens out of sight, the visible signs above usually appear only after the colony is well established, which is why early detection and a professional inspection matter so much.

DIY checks vs. a professional inspection

You can and should do basic checks yourself. Walk your foundation and crawl space looking for mud tubes, tap wood for hollow spots, inspect windowsills for wings and frass, and note any sagging floors or sticking doors. These DIY checks are great for catching obvious problems early.

What a homeowner cannot do is reliably confirm the species, locate the colony, gauge how far the damage extends behind walls, or rule out an infestation in inaccessible areas. Termites cause real structural damage, and store-bought sprays do not reach the colony. A licensed inspector uses moisture meters, probes, and experience to map the full extent of activity and recommend a treatment plan that actually works. If you spot even one of the signs above, schedule a professional inspection rather than waiting. Many companies offer free or low-cost inspections.

Termites also rarely travel alone. While a pro is on-site, it is worth asking about other common household invaders. The same prevention habits that deter termites help with our guides on how to get rid of ants, how to get rid of cockroaches, and how to get rid of mice and rats.

What does termite treatment cost?

Costs vary by region, home size, termite type, and severity, but here are rough U.S. ranges to set expectations:

• Inspection: often free to about $150, frequently waived if you book treatment.
• Liquid soil treatment (subterranean): roughly $500 to $2,500 depending on the home’s perimeter.
• Bait station systems: about $1,000 to $3,000 for installation, plus annual monitoring fees.
• Whole-home fumigation (drywood): typically $1,200 to $4,000 or more, priced by cubic footage.
• Annual termite protection plans: commonly $300 to $500 per year for ongoing monitoring and a renewable bond.

These figures are far cheaper than structural repairs, which can climb past $7,000 in serious cases. You can compare local pest control quotes to find the right fit for your home and budget.

How to prevent termites

Prevention comes down to denying termites the two things they love most: moisture and easy access to wood.

• Fix leaky faucets, pipes, and AC units, and keep gutters and downspouts directing water away from the foundation.
• Improve crawl space and basement ventilation to cut humidity, and use a vapor barrier where appropriate.
• Eliminate wood-to-soil contact: keep firewood, mulch, and lumber away from the house, and maintain a gap between siding and soil.
• Grade soil so water flows away from the home, and avoid piling mulch against the foundation.
• Seal foundation cracks and gaps around utility lines where termites can enter.
• Schedule a professional inspection every one to two years, especially if you live in a high-risk region. Find trusted pros in your city to stay ahead of problems.

Frequently asked questions

How do I know if I have termites or ants?

Termite swarmers have straight antennae, a thick waist, and four wings of equal length. Flying ants have bent antennae, a pinched waist, and front wings longer than the back pair. When in doubt, save a sample and let a pro identify it.

How fast do termites damage a house?

A single mature colony can eat through several pounds of wood a year. Visible structural damage usually takes a few years to develop, but because colonies hide for a long time before being noticed, damage may already be underway when you spot the first sign.

Can I get rid of termites myself?

DIY products may kill a few foragers but rarely reach the colony, so the infestation continues. Because termites threaten your home’s structure, professional treatment is strongly recommended for any active infestation.

Does homeowners insurance cover termite damage?

Usually not. Most policies consider termite damage preventable through maintenance, so it is excluded. That is one more reason regular inspections and prevention pay off.

How often should I get a termite inspection?

Every one to two years is a good rule for most homes, and annually in high-risk warm or humid regions. If you are buying a home, always get a termite inspection before closing.

Spotting even one of these signs of termites is your cue to act. A quick professional inspection can confirm whether you have a problem and stop small damage from becoming a costly structural repair.