Carpenter Bee Control
Carpenter bees look like bumblebees but with a shiny black abdomen instead of a fuzzy yellow one. They don't live in colonies — each female bores a perfectly round half-inch hole into exposed softwood (eaves, fascia, deck rails, fence posts, siding) and excavates a tunnel system inside, where she lays eggs. They don't eat the wood, but the galleries grow each year as offspring expand them, and woodpeckers tearing up the siding looking for carpenter bee larvae often cause more damage than the bees themselves.
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Signs you have a carpenter bees problem
- Round half-inch entry holes in unpainted softwood — eaves, fascia, deck rails, porch ceilings, fence posts, log walls
- Coarse sawdust on the ground or deck below the entry hole
- Large black-and-yellow bees hovering near eaves or porch ceilings in spring
- Yellow-brown staining on siding below entry holes (bee waste)
- Woodpecker damage near suspected carpenter bee galleries — woodpeckers can rip apart siding to access larvae
- Buzzing sounds from inside wood beams or eaves
Why carpenter bees are a serious problem
- Structural damage — galleries expand year over year and can weaken deck rails, fascia and porch ceilings
- Woodpecker damage — secondary damage from woodpeckers can be more expensive than the bee damage itself
- Aesthetic damage — staining and entry holes are visible from the street and reduce curb appeal
- Aggressive males — males hover near galleries and dive-bomb people, but they have no stinger; females can sting but rarely do
- Re-infestation — emerging adults often re-use the same gallery year after year, expanding it each season
Why DIY carpenter bees treatment usually fails
Spraying the entry hole kills the bee that's currently inside but doesn't reach the brood at the back of the gallery, doesn't kill emerging adults the next spring, and doesn't repair the wood damage. Plugging the holes without first dusting the gallery seals adults and larvae inside the wood, where decay or future emergence creates more damage. Effective treatment requires the right sequence — dust the gallery with an insecticidal dust, allow time for foraging bees to track it back into the gallery, then seal the holes only after activity has stopped.
The reality: Most homeowners who try DIY end up calling a pro anyway, after spending $50–$200 on hardware-store products and several weeks of failed attempts. The math almost always favors calling a licensed contractor up front.
What a professional carpenter bees treatment looks like
Licensed contractors identify all active galleries (often more than the homeowner notices), apply a residual dust into each gallery, return after activity ceases to seal the entry holes with a hardwood plug and wood filler, and recommend ongoing protective measures — painting or staining exposed softwood, or replacing soft pine trim with hardwood or composite where carpenter bees keep returning.
What it costs
Pricing varies by infestation severity, property size, and location, but most homeowners can expect quotes in the range described in the FAQ below. The contractor will give you an exact, no-obligation quote during the initial call.
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Frequently Asked Questions
Are carpenter bees dangerous?
Males have no stinger and are aggressive only in display. Females can sting but rarely do unless physically grabbed. The bigger danger is structural damage to the wood they bore into.
Will painting my wood prevent carpenter bees?
Painting helps significantly — carpenter bees strongly prefer unfinished or weathered softwood and usually avoid painted surfaces. Staining provides some deterrence but less than paint.
How much does carpenter bee treatment cost?
Most carpenter bee treatments run $200–$500 depending on the number of active galleries and how accessible they are. Treatments for multiple-story homes with high eaves can run higher.
When is the best time to treat for carpenter bees?
Late spring (April–June) when bees are actively excavating, or early fall when overwintering bees are settling back into galleries. Mid-summer is less effective because the adults are mostly outside the wood foraging.
Can I just plug the holes?
Not without first treating inside the gallery — sealing bees and larvae alive into the wood creates worse problems. Plug the holes only after all activity has stopped and the gallery has been treated.