Carpenter ants are among the most concerning pests that homeowners may encounter. Unlike many other ants, these insects don’t just forage for food inside your home—they can actually cause structural damage by tunneling into wood to build their nests. If you suspect that carpenter ants have found their way into your house, understanding why your home appeals to them and how to identify an infestation is critical for protecting your property.
Why Are Carpenter Ants Attracted to Your Home?
Carpenter ants do not eat wood like termites do, but they do excavate it to create nests, which can lead to costly damage over time. There are several reasons why your house might be an ideal environment for these ants:
1. Moisture Problems
Carpenter ants prefer damp or decayed wood because it’s easier to tunnel through. Leaking pipes, clogged gutters, roof leaks, or poor ventilation can create moist conditions that attract carpenter ants. Even small amounts of water damage inside walls or under floors can provide the perfect breeding ground for these ants.
2. Wood in Contact with Soil
If wood components of your home, such as siding, decks, or porch structures, are in direct contact with the soil, it gives carpenter ants easy access to establish colonies. They often begin their nests outside in rotting logs, stumps, or tree roots before moving indoors.
3. Access Points and Structural Gaps
Cracks, gaps, and holes in the foundation, walls, or around windows and doors make it easier for carpenter ants to enter and move inside your home. These entry points provide a protected route to reach wooden structures for nesting.
4. Nearby Trees and Vegetation
Trees and shrubs touching your home act as bridges, enabling carpenter ants to travel indoors. Dead or decaying trees in your yard are also common nesting sites and sources of carpenter ant colonies that can spread toward your house.
How to Identify Carpenter Ant Infestations
Knowing the signs of carpenter ants in house is the first step in addressing the problem before it worsens. Here are the most common indicators to watch for:
1. Sightings of Large Black or Red Ants
Carpenter ants are noticeably larger than many other ant species, measuring between 1/4 to 1/2 inch long. They can be black, red, or a combination of both colors. Seeing these ants frequently indoors or outdoors near your home suggests a nearby colony.
2. Rustling Sounds in Walls
Because carpenter ants hollow out wood for nesting, you may hear faint rustling or tapping noises coming from inside walls, ceilings, or floors, especially at night when the colony is active.
3. Frass Piles
Frass is a sawdust-like material made up of wood shavings and ant debris. Carpenter ants push frass out of their tunnels, creating small piles near entry points or baseboards. Spotting frass is a clear sign of active tunneling.
4. Damaged Wood
Wood that sounds hollow when tapped, or shows visible grooves and tunnels, indicates carpenter ant activity. The damage might be hidden under paint or behind wall coverings, so a thorough inspection is often necessary.
5. Winged Ants (Swarmers)
During mating season, winged carpenter ants leave the nest to start new colonies. Seeing large winged ants indoors or near windows is a strong sign of infestation.
Do Carpenter Ants Bite?
A common concern is whether do carpenter ants bite and if their bites are dangerous. Carpenter ants can bite using their strong mandibles to defend themselves if disturbed. While their bites may be painful and can cause minor skin irritation, they do not inject venom like fire ants or other stinging insects.
Most people experience only mild discomfort from a carpenter ant bite, but anyone with allergies should monitor for reactions and seek medical attention if symptoms worsen.
Why Ignoring Carpenter Ants Is Risky
While carpenter ants may not pose a direct health threat like some other pests, ignoring their presence can lead to serious structural damage. Over time, the tunnels and nests they create weaken wood beams, flooring, window frames, and other wooden parts of your home.
Damage caused by carpenter ants can be costly to repair, and an untreated infestation can quickly spread as the colony grows. Additionally, their presence may attract other pests, compounding the problem.
Preventing Carpenter Ant Infestations
Keeping carpenter ants away requires attention to conditions that attract them:
- Fix leaks and reduce moisture: Repair plumbing, improve drainage, and ensure proper ventilation in crawl spaces and attics.
- Maintain your home’s exterior: Seal cracks and gaps, keep wood trim painted and well-maintained, and avoid direct wood-to-soil contact by using concrete or metal barriers.
- Remove wood debris: Clear away stumps, dead trees, and firewood piles near your house.
- Trim vegetation: Keep branches and shrubs trimmed back from the home to prevent easy access.

When to Seek Professional Help
If you notice any signs of carpenter ants in house or suspect an infestation, professional inspection and treatment are the safest ways to protect your home. Carpenter ants often nest inside walls or hidden areas, making DIY solutions ineffective or temporary.
Professional pest control Delano providers use targeted treatments and can identify all colony sites, including satellite nests, to fully eradicate the infestation and advice on preventing future problems.
About Killian Pest Control
Killian Pest Control is a leading pest management company, we specialize in comprehensive pest control Delano CA solutions for homes and businesses, including expert treatment and prevention of carpenter ant infestations.
Our knowledgeable technicians combine thorough inspections with safe, effective methods tailored to your specific needs. Whether you are dealing with carpenter ants or other pests, Killian Pest Control is dedicated to protecting your property with reliable and professional service.