Silver Bullet Pest ControlCarpenter Ants: Identification, Risks, and Treatment
Large black ants on the kitchen floor in March, winged ants at a window, or little piles of sawdust under a baseboard? Here is how to tell carpenter ants from ordinary ants, how much harm they can really do to a house, and how Silver Bullet Pest Control finds the nest and gets rid of it.
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Not sure what you've got? Text a close-up photo of the ant to 973-510-2585 and we'll tell you.
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How do you identify carpenter ants, and are they dangerous to your house?
Carpenter ant identification comes down to three things: they are big (roughly 1/4 to 1/2 inch), usually black or black and red, and they have a narrow waist, elbowed antennae and an evenly rounded back. They don't eat wood like termites, but they hollow out damp or soft wood to nest, so a colony left alone for years can weaken window frames, sill plates and roof framing. Treatment means finding and treating the nest (and any satellite nests), fixing the moisture that drew them, and repairing damaged wood if needed. Call or text 973-510-2585 for a free quote.
Carpenter ant identification: what to look for
Most big black ants people see in North Jersey homes are carpenter ants, but not all. Check these features — a phone photo zoomed in is usually enough.
Workers
- About 1/4 to 1/2 inch long
- Black, or black with a reddish middle
- Smoothly rounded back from the side
- Bent (elbowed) antennae
Workers come in different sizes in the same colony, so finding small and large ones together is normal. They are most active at night.
Small nuisance ants
- Usually under 1/8 inch
- Trails to sugar or grease
- Nest in soil, slab cracks or walls
- No sawdust piles
Pavement ants, odorous house ants and Pharaoh ants are pests but they don't excavate wood. They need a different treatment than carpenter ants.
Termite swarmers
- Straight antennae
- Thick waist, no pinch
- Four wings of equal length
- Swarm indoors, often in spring
Winged termites are often mistaken for winged carpenter ants. The difference matters: termites eat the wood, and the treatment is completely different.
Signs of carpenter ants in your house
Frass (coarse sawdust)
Small piles of wood shavings mixed with insect parts under baseboards, window sills, door frames or in the basement near the sill.
Big ants inside in late winter
Seeing large black ants indoors in February or March usually means a nest inside the house, not one outside.
Winged ants at windows
Swarmers inside, usually in spring, point to a mature colony that has been there a while.
Faint rustling in walls
A quiet crinkling sound in a wall or ceiling at night, especially near a bathroom, kitchen or roof leak.
One or two big ants in summer can wander in from a tree outside. Ants every day, or ants in winter, is worth an inspection.
Carpenter ants vs. termites: how to tell them apart
| What you notice | Carpenter ants | Subterranean termites |
|---|---|---|
| Body shape | Pinched waist, rounded back | Straight, thick waist |
| Antennae | Elbowed | Straight, bead-like |
| Wings (swarmers) | Front wings longer than back wings | All four wings about the same length |
| What's left behind | Sawdust-like frass pushed out of the wood | Mud tubes and mud-packed galleries; no sawdust |
| Inside the wood | Smooth, clean, sanded-looking tunnels | Rough tunnels with soil in them |
| Do they eat wood? | No — they chew it out to nest | Yes — wood is their food |
| Usual treatment | Nest treatment plus moisture repair | Termite treatment to the soil and structure |
If you're unsure, save a few of the insects in a sealed bag or text us a photo. Seeing mud tubes instead of sawdust? Read our guide to signs of termite activity.
How much damage do carpenter ants cause?
Carpenter ants are slow. A single season usually does little harm. The risk builds when a colony is left in the same wood for several years, especially wood that keeps getting wet. Over time the galleries can weaken:
- Window and door frames where caulking failed and rain gets in.
- Sill plates and rim joists in damp basements and crawl spaces.
- Roof framing and fascia under a slow roof or gutter leak.
- Porch posts, decks and wood that touches soil or mulch.
The bigger warning is what the ants tell you: carpenter ants prefer wood that is already damp or starting to soften. A nest often means there is a leak, rot or poor ventilation that needs attention anyway.
Carpenter ants can bite if handled, but they don't sting and aren't known to spread disease. The main concern is the house, not your health.
Found soft or hollow wood? After treatment we can repair damaged wood — sill plates, joists, beams and framing — the same way we do for termite damage repair.
Where carpenter ants nest in North Jersey homes
A colony usually has a parent nest outdoors — in a dead tree, stump, old fence post, firewood pile or landscape timbers — and one or more satellite nests inside the house. Workers travel between them at night along fences, branches, wires and the foundation. That's why spraying the ants you see rarely ends the problem.
In the older wood-frame homes and two-families common across Bergen, Passaic, Essex and Hudson counties, we most often find satellite nests in:
- Hollow doors and the wall voids beside bathrooms and kitchens
- Window frames and bay windows
- Attic eaves and soffits under gutter overflows
- Foam board and insulation behind siding
- Porch roofs and box beams
Branches touching the roof and mulch piled against the siding make it easy for them to move in.
Carpenter ant treatment: how we do it
Inspect and confirm
We confirm they're carpenter ants (not termites or a smaller ant), then look for frass, trails and damp wood inside and around the yard, trees and stumps.
Find the nests
We track where the workers travel at night and look for the parent nest outside and satellite nests in walls, frames and the attic.
Treat the nest and the routes
Nests are treated directly where we can reach them, and the travel routes around the foundation and entry points are treated so returning workers carry it back.
Fix the reason they came
We point out leaks, wood touching soil, branches on the roof and wet areas, and repair damaged wood if the structure needs it.
Follow up
We check that activity has stopped. For homes that get ants every year, recurring service comes with a 100% satisfaction guarantee.
Want ongoing coverage? See our monthly and quarterly pest control plans.
DIY carpenter ant control vs. calling a professional
Store sprays
Kill the ants you see but can scatter a colony into new satellite nests. Not a fix for a nest in a wall.
Sweet ant baits
Some carpenter ants take them, many ignore them. Baits work best when placed on active trails.
Trimming and cleanup
Worth doing yourself: cut back branches from the roof, move firewood away from the house, pull mulch back from the siding.
Fixing moisture
The most useful thing you can do — repair leaks, clean gutters and dry out damp basements.
If you've sprayed for weeks and still see ants, or you find frass or soft wood, the nest is still there. Call or text 973-510-2585.
What affects the cost of carpenter ant treatment
We give a free quote after we see the home. These are the things that change the price — no surprises:
| Factor | Simpler job | Bigger job |
|---|---|---|
| Where the nest is | Outdoor stump or one window frame | Several satellite nests in walls and attic |
| How long | Just noticed this season | Ants every spring for years |
| Moisture | Dry house, one small leak | Ongoing roof, gutter or basement leaks |
| Damaged wood | No soft wood found | Sill plate, joist or framing repair needed |
| Ongoing service | One-time treatment | Recurring plan for a property that gets ants yearly |
For a fuller picture of ant pricing, read what affects ant exterminator cost.
Related ant and wood pest pages
Get a Free Carpenter Ant Quote
Tell us where you're seeing the ants or sawdust, and send a photo if you can. We'll confirm what they are and explain the plan.
Why people call us about carpenter ants
- Big black ants in the kitchen in late winter
- Sawdust piles under a window or baseboard
- Winged ants at the windows in spring
- Soft or hollow wood found during a repair
- Ants back every year no matter what they spray
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Carpenter Ant Questions
How can I tell if I have carpenter ants or regular ants?
Size is the first clue: carpenter ants are about 1/4 to 1/2 inch long, much bigger than most house ants. They also have a smoothly rounded back and are usually black or black and red. Small ants trailing to sugar on the counter are almost always a different species that needs a different treatment.
Do carpenter ants eat wood like termites?
No. Carpenter ants chew through wood to make nesting galleries and push the shavings out as frass, but they don't digest it. Termites actually eat wood. That's why carpenter ants leave sawdust piles while termites leave mud tubes and soil-packed tunnels instead.
Can carpenter ants destroy a house?
Not quickly. Carpenter ant damage builds slowly over several years, mostly in wood that stays damp. A long-term colony can weaken window frames, sill plates or roof framing, so it's worth treating early and fixing the moisture that attracted them.
What does carpenter ant frass look like?
It looks like coarse sawdust or pencil shavings, often mixed with dead ant parts and bits of insulation. You'll find it in small piles below a crack, a window sill, a baseboard or a hole in the wood. Fresh frass reappearing after you clean it up means the nest is active.
Why do I see carpenter ants in the house in winter?
Carpenter ants active indoors in winter usually means a nest inside the warm part of the house, such as a wall void, door frame or under a bathroom. Ants from an outdoor colony stay dormant in the cold, so winter sightings are a strong reason to have the home inspected.
How long does carpenter ant treatment take to work?
Most homes see a big drop in activity within one to two weeks once the nests and travel routes are treated. A large colony with several satellite nests can take longer and may need a follow-up visit. Fixing leaks and damp wood helps keep them from coming back.
Is carpenter ant treatment safe for kids and pets?
Yes, when it's done by a licensed applicator. We treat nests and cracks directly instead of spraying open rooms, and we tell you how long to keep kids and pets away from any treated area. Ask us about your household before the visit and we'll plan around it.
Can I get rid of carpenter ants myself?
You can handle the prevention — trimming branches, moving firewood, fixing leaks — and sometimes a small outdoor nest. A nest hidden in a wall or roof is hard to reach without professional tools, and sprays can split the colony into more nests. If ants keep coming back, call a pro.
Do you repair wood damaged by carpenter ants?
Yes. After the ants are treated, we can repair damaged wood such as sill plates, joists, beams and framing, the same way we repair termite damage. We'll show you what we find and quote the repair separately.
Are winged ants in spring termites or carpenter ants?
Check the waist and wings. Carpenter ant swarmers have a pinched waist, elbowed antennae and front wings longer than the back ones. Termite swarmers have a thick waist and four equal wings. Text us a photo at 973-510-2585 and we'll tell you which.
¿Tratan hormigas carpinteras en español?
Sí. Hablamos español. Llame o mande texto con una foto de la hormiga al 973-510-2585 y le decimos qué es y cómo eliminarla.
Carpenter ant control across North Jersey
We're based in Garfield and treat carpenter ants across Bergen, Passaic, Essex and Hudson counties, plus scheduled visits farther out.
Updated November 2026 by the Silver Bullet Pest Control team, Garfield, NJ • NJ License 90568B