Carpenter Ant Control

Carpenter ants excavate wood and are the ant that matters most in Central New York. We locate the parent and satellite nests and treat for structural protection.

Carpenter ants are the large black ants you see in Central New York homes, often at night or in early spring, and they're the ant most likely to cause real damage. They tunnel into damp or damaged wood to nest — around leaky sills, roof edges, decks, and bathrooms — and a generic ant spray does nothing about the colony producing them.

We locate the parent and satellite nests, treat with products the colony carries back to the source, and point out the moisture conditions fueling the problem. This is a dedicated service because carpenter ants need a different, more thorough approach than nuisance ants.

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Why carpenter ants are the ant that matters in Central NY

Ask any pest professional in the Finger Lakes what the number-one ant is, and the answer is carpenter ants. Our cool, wet climate and older, wood-framed housing stock give them exactly what they want: wood that has been softened by moisture. They don't eat the wood the way termites do — they excavate smooth galleries in it to build their nests, hollowing out damp framing around leaky roofs, windows, sills, decks, and bathrooms over months and years.

A carpenter ant infestation is really a network, not a single nest. There is a parent colony, usually outdoors in a stump, woodpile, or tree, and one or more satellite nests that workers set up in nearby structures — including inside your walls. The queen may never be in the part you can see. That is why spraying a trail of ants on the counter accomplishes nothing lasting, and why repellent sprays can actually make things worse by causing the colony to split into more satellite nests.

Effective carpenter ant control means finding the nests, using non-repellent products and baits that workers carry back to share through the colony, and correcting the moisture that drew them in the first place. Left alone for years, an established colony can genuinely weaken structural wood, which is why this is a service worth doing properly rather than a can-of-spray afterthought.

Signs of carpenter ants

Large black ants (¼ to ½ inch) indoors, especially at night or on warm spring days.
Small piles of sawdust-like shavings (frass) near woodwork, windowsills, or in the basement.
A faint rustling sound inside walls or wood trim in a quiet room.
Winged ants emerging indoors in spring, a sign of a mature nest nearby.
Foraging trails to moisture or food sources in kitchens and bathrooms.

How we treat it

1
Identification & inspection
We confirm carpenter ants and look for the structural nesting and moisture conditions that come with them.
2
Nest location
We trace trails and moisture to the parent nest and any satellite nests, indoors and out — the step that makes treatment last.
3
Non-repellent treatment & baiting
We treat voids, entry points, and the exterior perimeter with products and baits that workers carry back to affect the whole colony, not just foragers.
4
Moisture correction guidance
We point out the leaks, gutter problems, and wood-to-soil contact drawing them, so the conditions don't invite a new colony.
5
Follow-up
We confirm the colony is knocked down and re-treat if foragers persist.

What to expect

Results build over a couple of weeks as bait moves through the colony, rather than an instant kill of the visible ants.
We'll flag any wood that looks damaged enough to warrant a closer structural look.
Exterior perimeter treatment helps stop new colonies moving in from nearby trees and woodpiles.
Covered under the guarantee — if the same nest keeps producing, we come back.

Seasonality in Central NY

Spring (Apr–Jun): prime season. Colonies wake, foragers appear, and winged reproductives may swarm — the best time to treat before satellites establish.
Summer: peak activity, most visible at dusk. Storm moisture can expand nesting sites.
Fall and winter: activity slows; ants overwinter in wall voids and sometimes appear on warm winter days, a sign of an indoor nest.

What it costs

Carpenter ant treatment is priced by the extent of the infestation and whether structural nesting is involved — a single satellite nest is a smaller job than a colony spread through a moisture-damaged wall.

We quote honestly after locating the nests, and if carpenter ants have caused damage that needs a carpenter, we'll tell you straight rather than paint over it.

How to prevent it

Fix roof, gutter, and plumbing leaks promptly — carpenter ants need moisture-softened wood.
Keep firewood off the ground and away from the house; trim branches touching the roof.
Correct wood-to-soil contact on decks, porches, and siding.
Seal gaps around windows, sills, and utility lines.

Confirming carpenter ants — and finding the nest

Carpenter ants are the large ants — roughly a quarter to a half inch — usually black or a mix of dark red and black, with a smoothly rounded upper thorax and a single node at the waist. The single most useful sign of an active structural nest is frass: coarse, sawdust-like shavings mixed with bits of dead insects that the ants push out of their galleries. A small cone of frass under a windowsill, door frame, deck ledger, or basement beam is strong evidence that a nest is inside that wood.

Central New York homeowners most often notice carpenter ants indoors on warm days from late winter into spring, and a steady indoor presence in that window usually means an established parent colony nearby, often with satellite nests spread through the structure. Some people also report a faint rustling or crinkling sound inside walls where a large colony is active. Winged reproductives (swarmers) emerging indoors are another sign — and it is worth distinguishing them from termite swarmers, which have straight antennae and equal-length wings, versus the carpenter ant's elbowed antennae and unequal wings.

Why carpenter ants thrive in CNY homes

Carpenter ants are arguably the defining structural pest of Central New York, and the reason is the combination of mature woods and moisture-prone older housing. They do not eat wood; they excavate it to nest, and they strongly prefer wood that is damp or has been previously water-damaged. Our climate — heavy snow, ice dams, humid summers, and a lot of century-old homes with imperfect flashing and drainage — creates exactly the soft, moist wood they seek out.

That is why activity so often centers on predictable spots: around roof edges and gutters where ice dams back water up, near chimneys and skylights, under decks and porches, around basement windows, and behind bathrooms and kitchens where small leaks go unnoticed. A carpenter ant problem is frequently a moisture problem the ants discovered first, which is why lasting control and finding that hidden dampness go hand in hand.

The structural stakes

In much of New York, where aggressive subterranean termites are less of a constant threat than in the South, carpenter ants are the wood-destroying insect most homeowners actually need to watch. They work more slowly than termites, but an established colony — especially one operating for years with multiple satellite nests — can hollow out significant galleries in structural framing, trim, and decking over time. Because they favor already-compromised wood, their damage often compounds an existing moisture problem.

There is also the early-warning value: a carpenter ant nest is frequently the first visible sign that water is getting somewhere it shouldn't. Treating the ants without finding and fixing that moisture source tends to invite them right back, so the two problems are best addressed together. Catching it early — at the first spring foragers and the first frass — is far cheaper than repairing years of hidden excavation.

Why reaching the colony matters more than spraying ants

Carpenter ants are a textbook case of why spraying visible ants backfires. A repellent spray can cause a colony to 'bud,' splitting and relocating into several new satellite nests, so a week later you have ants in three rooms instead of one. And because the workers you see foraging are only a small fraction of the colony — the queen and brood stay hidden in the wood — killing foragers does nothing to end the nest. The whole game is reaching the colony.

Professional control uses non-repellent products and targeted baits that foragers carry back into the galleries, moving the active ingredient through the colony to the queen, combined with locating the likely nest by reading the trails, the frass, and the moisture clues. For a lasting fix we also flag the water source that drew them — the leaking gutter, the damp sill, the ice-dam damage — because a carpenter ant program that ignores the moisture is one that gets a repeat call next spring.

Frequently asked questions

How do I know these are carpenter ants and not regular ants?

Carpenter ants are large — ¼ to ½ inch — and usually black. Sawdust-like frass near woodwork, activity at night, and winged ants indoors in spring all point to a carpenter ant colony nesting in the structure.

Do carpenter ants really damage a house?

They can. They don't eat wood, but they excavate galleries in damp or damaged wood to nest, and an established colony left alone for years can weaken structural members. Moisture is always the common thread.

Why didn't the ant spray from the store work?

Repellent sprays kill visible foragers and can split the colony into more satellite nests. We use non-repellent products and baits carried back to the nest, treating the source instead of the symptom.

What's the difference between carpenter ants and termites?

Both damage wood, but carpenter ants leave clean galleries and sawdust-like frass, while termites eat wood and leave mud tubes. If you're buying or selling, our WDI inspection covers both.

Where are the ants nesting?

Usually in moisture-damaged wood — around leaky roofs, gutters, window and door frames, decks, and bathroom or kitchen walls — with a parent nest often outdoors and satellites inside. We trace them to the source.

How long until they're gone?

Trails thin within days, but fully affecting the colony through bait takes a couple of weeks. We follow up to confirm the nest is knocked down, not just the ants you were seeing.

Will they come back next year?

Not if the nest is eliminated and the moisture that drew them is corrected. We treat the source and point out the leaks and wood-to-soil contact behind the problem.

Should I wait to see if they go away in winter?

No. Carpenter ants overwinter inside heated walls and resume in spring, and the longer a colony works in damp framing, the more damage it does. Early treatment is cheaper and protects the wood.

How is this different from your general ant service?

General ant control handles the smaller trailing ants (odorous house ants, pavement ants) that are mostly a kitchen nuisance. Carpenter ant control is a structural service: it's about locating and eliminating a wood-nesting colony that can damage your home, and addressing the moisture that attracted it. The identification and the stakes are different, so the approach is too.

I see a few big black ants inside every spring — is that a problem?

Potentially, yes. Large black ants appearing indoors on warm spring days often mean a colony is nesting in or near the structure and has been active long enough to forage inside. If you also find frass (coarse sawdust with insect bits) under a sill or beam, that's a strong sign of a nest in the wood, and it's worth an inspection.

Do carpenter ants mean I have a moisture problem?

Very often. Carpenter ants prefer damp or previously water-damaged wood, so a nest frequently points to a hidden leak, condensation issue, or ice-dam damage nearby. Part of solving it for good is finding and flagging that moisture source — treating the ants alone tends to invite them back.

Can I just spray the ants I see?

It usually makes things worse. Repellent sprays can cause the colony to split and relocate into multiple new nests, and the foragers you see are only a fraction of the colony. Non-repellent baiting that reaches the queen is what actually eliminates a carpenter ant nest.

Our guarantee

Covered by our defined-term service guarantee: if covered pests return during the service period, we re-treat at no additional charge. See Our Guarantee for terms and exclusions.

Read our guarantee terms →