Termites in Hardwood Floors: Signs, Risks & What to Do

Soft spots or hollow sounds in your hardwood floors? It could be termites. Good Sense Termite explains the signs, risks, and next steps for Bay Area homeowners. Free inspections in San Jose.

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About the Author: Jameson Elam is the owner and operator of Good Sense Termite, serving Alameda, Santa Clara, San Mateo, and Santa Cruz counties. With over 14 years of hands-on experience in the termite control industry, Jameson specializes in thorough inspections, accurate diagnostics, and long-term solutions tailored to California homes. His deep knowledge of local termite behavior and building structures has made Good Sense Termite a trusted name for homeowners and real estate professionals alike.

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Hardwood floors are one of the most valued features in a Bay Area home. They're beautiful, durable, and add real value to a property. They're also, unfortunately, one of the places termites can do some of their most frustrating damage — quietly, invisibly, and often for years before anyone notices.

If you've been wondering whether termites can affect your floors, the answer is yes — and here's everything you need to know about how it happens, what to look for, and what to do about it.

How Termites Get Into Your Floors

There are two primary ways termites end up in or beneath your floors, and they correspond to the two main termite species active in the Bay Area.

Subterranean Termites: From Below

Subterranean termites are the more common culprit when it comes to floor damage. They live in the soil beneath your home and travel upward through the crawl space, feeding on the floor joists, subfloor, and eventually the structural wood supporting your hardwood floors from underneath.

Because subterranean termites work from the bottom up, homeowners often don't notice anything wrong until the damage has already compromised the structural integrity of the floor — at which point soft spots, sagging, or visible warping may appear.

Drywood Termites: From the Wood Itself

Drywood termites are less commonly found in floors than in attic framing or wall structures, but they can and do infest hardwood flooring — particularly in older Bay Area homes where flooring has gaps, cracks, or exposed wood edges. They enter directly into the wood and hollow it out from the inside, leaving the surface looking intact until the infestation is well advanced.

Signs of Termites in or Near Your Floors

Knowing what to look for is the first step to catching floor damage early. Here are the most common signs:

Soft spots or springiness underfoot. If areas of your floor feel soft, spongy, or slightly give when you walk on them, it's worth investigating. This can indicate damage to the subfloor or floor joists beneath — often from subterranean termites feeding from below.

Sagging or uneven floors. Floors that were previously level but now appear to dip or sag in certain areas may have compromised structural support beneath them. This is a more advanced sign of subfloor or joist damage.

Hollow sound when tapped. Healthy hardwood floor should produce a solid sound when tapped. A hollow or papery sound suggests the wood beneath the surface has been hollowed out — a classic sign of drywood termite damage.

Frass near floor edges or vents. Small piles of pellets resembling coarse sand near baseboards, floor vents, or the edges of hardwood flooring can indicate drywood termite activity. Frass is often pushed out through small kick-out holes and may accumulate in corners or along walls.

Mud tubes near the base of walls. Subterranean termites build mud tubes to travel from the crawl space up through walls and into flooring. Finding mud tubes at the base of interior walls or near floor-level vents is a strong indicator of active subterranean termite activity affecting the floor structure.

Buckling or blistering of hardwood. Termite activity — particularly subterranean termites working from below — can cause moisture changes in the subfloor that result in hardwood planks buckling, warping, or blistering. This is sometimes mistaken for a moisture or humidity issue, so having a professional assess the cause is important.

How Serious Is Termite Damage to Floors?

The seriousness depends largely on how long the infestation has been active and which part of the floor structure is affected.

Surface-level drywood termite damage to hardwood planks is concerning but may be addressed with localized treatment and targeted floor repairs if caught early enough.

Subfloor and floor joist damage from subterranean termites is more serious. Floor joists are structural elements — they bear the weight of your home's floors and everything on them. Significant joist damage can compromise the structural integrity of your floor and require substantial repairs beyond just the hardwood surface itself.

This is why early detection matters so much. A professional inspection that catches subterranean activity in the crawl space before it reaches the subfloor is a very different situation — and a much less expensive one — than discovering widespread joist damage after years of undetected feeding.

What to Do If You Suspect Termites in Your Floors

Step 1: Don't ignore the signs. Soft spots, hollow sounds, and frass near floor edges are not things to chalk up to normal wear and age. These are specific, actionable warning signs that warrant professional attention.

Step 2: Schedule a professional inspection. A licensed termite inspector will assess both the surface signs and the underlying structure — including the crawl space beneath your floors — to determine whether termites are present, which species, and how extensive the activity is.

Step 3: Get a clear treatment and repair assessment. Depending on the findings, treatment may involve soil termiticide application (for subterranean termites), localized spot treatment, or fumigation (for widespread drywood activity). Any structural damage to floor joists or subfloor will need to be assessed separately for repairs.

Step 4: Address conducive conditions. If subterranean termites reached your floors through the crawl space, the moisture and accessibility conditions that allowed it should be addressed — vapor barrier, ventilation, wood-to-soil clearance — to reduce the risk of recurrence after treatment.

Can Termite-Damaged Hardwood Floors Be Saved?

Sometimes, yes — particularly when damage is caught early and is limited to surface planks rather than the structural subfloor and joists. In these cases, affected sections of hardwood can be replaced and the floor refinished.

When joist or subfloor damage is significant, structural repairs are required before any surface flooring work can be done. A termite company can assess the pest issue; a licensed contractor handles the structural repairs. At Good Sense Termite, we'll give you a clear picture of the damage we find and help you understand what the repair process involves.

The Bottom Line

Termite damage to hardwood floors is more common in Bay Area homes than most homeowners realize — and it's one of the most frustrating types of damage to discover because of how long it can go undetected. The good news is that catching it early, through regular professional inspections, keeps your options open and your repair costs manageable.

If you've noticed any of the signs described above — or you just want peace of mind about what's happening beneath your floors — give us a call. Free inspections, honest answers, no pressure.

Call or text Good Sense Termite at (408) 418-9152) or request your free inspection online.

It's just good sense.

Frequently Asked Questions: Termites in Hardwood Floors

Can termites really damage hardwood floors?

Yes. Both drywood and subterranean termites can damage hardwood flooring, though they do so differently. Subterranean termites typically attack from below — feeding on floor joists and subfloor before the hardwood surface is affected. Drywood termites can infest hardwood planks directly, hollowing them out from the inside while leaving the surface intact.

What do termites in hardwood floors look like?

You're unlikely to see the termites themselves in your flooring — they stay hidden inside the wood. What you'll see are the signs: soft spots underfoot, hollow sounds when tapping, frass (small sand-like pellets) near baseboards or vents, mud tubes near floor-level walls, or buckling and warping of hardwood planks.

How do I know if soft spots in my floor are from termites or moisture damage? Both termites and moisture can cause soft spots, and they sometimes occur together. The key differences: termite damage (particularly subterranean) often shows accompanying signs like mud tubes or frass, while moisture damage is typically associated with visible water staining, mold, or a musty odor. A professional inspection can determine the cause with certainty.

Will termite treatment save my hardwood floors?

Treatment eliminates the termites but doesn't repair the damage they've caused. Whether your hardwood floors can be saved depends on the extent of the damage. Surface-level damage to planks may be repairable with targeted replacement and refinishing. Significant subfloor or joist damage requires structural repairs by a licensed contractor before the floor surface can be addressed.

How long does it take for termites to damage hardwood floors?

This depends on the species, colony size, and conditions. A large subterranean termite colony can cause significant structural damage to floor joists over a period of years. Drywood termite colonies grow more slowly but can hollow out wood extensively if left untreated for several years. This is why annual inspections are so valuable — catching activity early dramatically limits the damage.

Are Bay Area homes with crawl spaces more vulnerable to termite floor damage? Yes. Homes with crawl space foundations have wood floor framing — joists, sill plates, and subfloor — in close proximity to the soil, which is where subterranean termites live and forage. This proximity makes crawl space homes significantly more vulnerable to floor structure damage from subterranean termites than slab foundation homes.