Direct answer: Small, clean round holes under eaves are usually carpenter bee nesting holes in exposed wood trim, soffit, or fascia. The right fix is to confirm whether the holes are active, repair any softened wood, then fill and repaint or replace the damaged soffit or fascia section.
Most likely: The most common cause is unfinished or weathered wood under the eaves that carpenter bees have drilled for nesting, especially on older fascia edges, rake ends, and wood soffit panels.
Start by separating three lookalikes: active carpenter bee holes, old abandoned holes, and wood rot that just happens to be nearby. Reality check: one or two holes may be minor, but a row of repeat holes under the same eave usually means the wood has been inviting them for a while. Common wrong move: patching the face and skipping paint, which leaves the same bare wood for next season.
Don’t start with: Do not start by smearing caulk into every hole the same day you find it. If bees are still active, they often reopen the spot or move a few inches over, and you can miss hidden wood damage behind the face.
You see one or more neat round holes on the underside of the eave, often with light brown or yellow streaking below them.
Start here: Check for active bee traffic first, then inspect the wood around each hole for softness or splitting.
The holes look weathered or painted over, and you do not see bees hovering nearby.
Start here: Probe the surrounding wood gently to see whether you only need filling and paint or a small section replacement.
Fresh debris keeps showing up below the same area, especially in warm weather.
Start here: Look for active drilling and listen for buzzing in the wood before you repair the face.
The area has round holes, but the wood also feels punky, swollen, or split.
Start here: Treat this as possible moisture damage first, because rotten soffit or fascia will not hold a lasting patch.
Carpenter bees prefer sound but unprotected softwood under overhangs where the wood stays dry enough to drill and is easy to revisit year after year.
Quick check: Watch the area for a few minutes in daylight. If a large bee hovers in front of the hole or slips inside, the hole is active.
Many homeowners notice the holes after paint starts peeling or staining appears, even though the bees are no longer using them.
Quick check: Look for faded edges, old paint inside the hole, and no fresh dust or bee activity over several warm days.
If the eave wood stays damp from roof edge leaks, failed paint, or poor drip control, it weakens and becomes easier to damage and harder to repair cleanly.
Quick check: Press lightly with an awl or screwdriver near the hole. If the wood sinks in easily or crumbles, rot is part of the problem.
Carpenter ants usually do not make the same clean round entry hole, but they often show up in damp, damaged trim and can be mistaken for bee damage from the ground.
Quick check: If the opening is ragged instead of round, or you see ant frass and ant traffic rather than hovering bees, you are likely dealing with a different pest.
You want to separate bee damage from ant damage, rot, or old patched holes before you start filling or replacing trim.
Next move: If the holes clearly match active or old carpenter bee damage, move on to checking whether the wood is still solid enough to repair. If the openings are ragged, ant-shaped debris is present, or the damage is not round, stop treating this as a carpenter bee problem and inspect for carpenter ants or rot instead.
What to conclude: Clean round holes point strongly to carpenter bees. Ragged openings or widespread soft wood point to a different repair path.
A filler repair only lasts if the soffit or fascia is still structurally sound. Soft wood needs replacement, not cosmetic patching.
Next move: If the wood stays firm and only the drilled tunnels are damaged, you can usually repair the holes and refinish the surface. If the probe sinks in easily, the face crumbles, or the board is split through, plan on replacing that soffit or fascia section.
What to conclude: Solid wood supports a localized repair. Soft or swollen wood means moisture has already weakened the assembly and patching alone will fail.
If bees are still using the tunnels, sealing them immediately often leads to new holes nearby and leaves you guessing whether the activity actually stopped.
Next move: If activity stops and the surface is clean, you are ready to repair the wood instead of chasing new holes. If bees keep returning to the same eave or there are many holes across multiple runs, bring in pest control before you patch and paint.
This is where you choose the lasting fix: fill isolated holes in sound wood, or replace the soffit or fascia section if the damage is soft, split, or repeated across the same board.
Next move: If the surface ends up solid, smooth, and fully coated, you have removed the weak target area and closed the old nesting holes properly. If filler keeps breaking out, the board will not hold fasteners, or more hidden voids appear as you open it up, replace the section instead of patching further.
Carpenter bees are repeat visitors. A good repair without a good finish often becomes next season's hole pattern.
A good result: If the repaired area stays quiet through warm weather and no fresh dust or new holes appear, the repair is doing its job.
If not: If new holes appear a few inches away on the same run, the finish coverage or the untreated active area was incomplete, and you need to address the whole exposed section, not just one hole.
What to conclude: The repair is not done until the wood is sealed and monitored. That finish coat is what helps break the repeat pattern.
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Usually not at first, but they can become one if the same board gets drilled year after year or if moisture has already softened the wood. A few clean holes in solid trim are often a localized repair. Soft, split, or repeatedly tunneled wood is a replacement job.
Carpenter bee holes are typically clean, round, and drilled into the face or underside of the wood. Carpenter ant damage is usually more ragged and shows up in damp or decayed wood, often with ant traffic or fine debris rather than one neat round opening.
Only after activity has stopped and only if the surrounding wood is still solid. Caulk alone is not a good repair for a drilled cavity in trim. Fill the hole properly, then prime and paint the area so the wood is sealed.
Carpenter bees like protected, repeatable spots. If the wood is weathered, bare, or only spot-patched, they often come back to the same run or drill a new hole nearby. The lasting fix is solid repair plus a full protective finish on the exposed section.
Not always. If the wood is hard and the damage is limited, a localized filler repair can work well. Replace the section when the wood is soft, split, badly tunneled, or too deteriorated to hold a clean patch and paint finish.