Carpenter Bee Control in Media and Delaware County, PA

Signs of Carpenter Bees in Your Deck, Fascia or Rails

Carpenter bees look like bumble bees at first glance, but the top of the abdomen is shiny, hairless and black. In April and May they hover in front of eaves and decks, and males dart at anyone who comes close. Males can't sting; females can, but rarely do unless handled.

Bumble bees, by contrast, have fuzzy yellow hair over most of the abdomen and nest in the ground or old insulation, not in solid wood. If the bee you are watching disappears into a neat round hole in a board, it is a carpenter bee.

• Perfectly round holes about 1/2 inch across, usually on the underside or edge of a board
• Small piles of coarse, light-colored sawdust on the deck or ground below
• Yellowish-brown stains running down from the holes
• Bees hovering repeatedly at one spot on fascia, rails, pergolas or wood siding
• Faint chewing sounds from inside the wood in spring

How Much Damage Can Carpenter Bees Cause?

A female bores straight in about an inch, then turns and tunnels along the grain to lay her eggs. A new tunnel may be only a few inches long, but bees return to old galleries and extend them, and several bees often work the same board. Over a few seasons that can weaken rails, fascia and trim and let water into the wood.

They favor bare or weathered softwood such as cedar, pine, redwood and untreated trim. That makes newer Delaware County subdivisions with large decks and pergolas, and older homes with wooden fascia and rafter tails, regular targets. Painted, well-maintained wood is attacked far less often.

Carpenter bees spend the winter as adults inside old tunnels, which is why the same deck seems to come alive every April. Holes that were never sealed become the starting point for next year's galleries, and each generation adds to the network.

The Woodpecker Problem That Follows Carpenter Bees

In summer, carpenter bee larvae develop inside the tunnels, and woodpeckers can hear them. The birds chisel along the gallery to get at the larvae, leaving ragged, gouged openings much larger than the bee's neat entrance. On fascia and gable trim, woodpecker damage is often the first thing a homeowner notices.

Stopping the bees removes the food that draws the birds. Treating active galleries and sealing old ones is usually what ends the woodpecker damage, along with repairing the boards they opened up.

How We Inspect Outdoor Wood for Carpenter Bees

Carpenter bees use the same boards year after year, so we look for old holes as well as active ones and note which surfaces are bare or weathered, since that drives both treatment and prevention. Soft, crumbling wood with mud tubes nearby points to termites rather than bees, and we'll tell you if we see that. The free inspection covers:

• Fascia boards, rafter tails, soffits and gable trim
• Deck rails, the undersides of deck boards and stair stringers
• Pergolas, arbors, play sets and wooden outdoor furniture
• Sheds, fences and wood or log siding

Carpenter Bee Treatment Options and Trade-Offs

The treatment that matters most goes inside the gallery, where the bees and larvae are. Surface sprays alone tend to wear off quickly in sun and rain.

Carpenter bees are solitary and don't build hives or store honey; if you are seeing a cluster of bees or a colony inside a wall, see bee removal. Paper wasps also chew weathered wood, but they scrape the surface rather than drilling holes, and our wasp nest removal page covers them.

• Gallery treatment: a dust formulation placed into each hole so bees moving through the tunnel contact it. The core of every carpenter bee job.
• Surface treatment: a residual application to favored boards can discourage new boring for a while, but it breaks down outdoors.
• Sealing: holes are plugged with a wood dowel, wood filler or exterior caulk after the bees are gone. Sealing too soon traps bees, which simply chew a new exit.
• Finishing: paint or a solid stain on bare wood makes it much less attractive to next year's bees.

Pennsylvania Pesticide Law and Lead-Paint Rules for Trim Repair

Gallery treatments for hire fall under the Pennsylvania Pesticide Control Act of 1973, administered by the Pennsylvania Department of Agriculture (PDA), which licenses pest control businesses and certifies their applicators. Under 7 Pa. Code § 128.31, the business license number belongs on the service vehicle, and you're entitled to ask for it. Product labels also carry pollinator warnings that limit spraying blooming plants where bees are foraging, one reason we put product inside the holes rather than across the yard.

Sealing and repainting can bring a second rule into play. In homes built before 1978, EPA's Renovation, Repair and Painting Rule requires paid contractors who disturb painted trim to follow lead-safe work practices, which is worth knowing before anyone sands fascia on an older twin. This is general information, not legal advice.

Your Carpenter Bee Treatment Visit

Carpenter bee work is quick per hole but thorough across the house, because missed holes become next year's nests.

1. 1

   Call when you see activity

   April through June is the usual season. Tell us where the bees are hovering and whether you've noticed sawdust or woodpecker damage.

2. 2

   Free inspection

   We check every wood surface around the house and count active and old holes.

3. 3

   Written quote

   The quote covers treatment, sealing recommendations and any follow-up.

4. 4

   Treat each active gallery

   Every hole receives treatment inside the tunnel, including hard-to-see holes on the undersides of rails.

5. 5

   Leave holes open for now

   Treated holes stay open for a short period so returning bees pass through the treatment.

6. 6

   Seal and finish

   Once activity stops, the holes are plugged and the wood can be painted or stained.

What Affects Carpenter Bee Treatment Cost?

Carpenter bee jobs are quoted in writing after the free inspection. These factors set the price:

House style changes the math. A newer Concord or Chester County deck with forty holes along waist-high rails can be treated from the ground in one pass, while a 1940s Delaware County twin with a dozen holes in the gable trim needs ladder work at the roofline and more time per hole. If woodpeckers have already opened the galleries, we treat what's left of the tunnels and flag the boards for a carpenter, since that repair sits outside a pest control quote.

• How many active holes there are and how spread out they are
• Height, from deck rails at waist level to gable trim on a second story
• How much bare or weathered wood is involved
• Whether sealing the holes is part of the job
• Whether a return visit is needed later in the season
• Woodpecker damage that should be flagged for carpentry repair

Carpenter Bee Control in PA: Timing, Sealing and Next Spring

Treat when bees are active, typically April through June, and again in late summer if new adults are emerging from old holes. Wait until activity has stopped, usually a few days to a couple of weeks after treatment, before sealing. Holes left open over winter give next year's bees a ready-made home, so get them plugged by fall.

A few habits keep the bees from coming back:

• Paint or apply solid stain to bare decks, rails and trim
• Replace soft, heavily tunneled boards rather than just patching them
• Check fascia and deck undersides each April for fresh sawdust
• Plug any old holes you find before spring
• If the deck is due for staining anyway, do it after the holes are sealed so the finish covers the plugs