Ant Control NYC: Carpenter, Odorous & Pavement

Every spring, New Yorkers across all five boroughs start seeing ants. Whether it is a trail of tiny black ants crossing the kitchen counter in a Queens row house, large black carpenter ants in a Brooklyn brownstone basement, or pavement ants pushing soil up through sidewalk cracks near a Bronx apartment building entrance, ant season in New York City is predictable — and so is the confusion about what species you are dealing with and what to do about it.

The three ant species most commonly encountered in NYC homes and buildings are carpenter ants, odorous house ants, and pavement ants. Each requires a completely different treatment approach, and misidentification leads to wasted money and ongoing infestations.

Carpenter Ants: The Structural Threat

Carpenter ants are the largest common ant species found in NYC, typically measuring 1/4 to 1/2 inch in length. They are usually black, though some species are bicolored red and black. Unlike termites, carpenter ants do not eat wood — they excavate it to build galleries for their nests. This excavation weakens structural wood over time and represents a genuine property damage risk.

In NYC's dense housing stock, carpenter ants are frequently found in:

• Basement and crawl space framing with moisture damage
• Around window and door frames in brownstones and row houses
• Wood near leaking pipes or condensation sources
• Roof eaves and fascia boards in attached housing

Treatment involves locating and treating the satellite colonies (which are often inside the structure) as well as the parent colony (which may be outdoors in a tree or log). Simply baiting foraging workers does not solve a carpenter ant problem. Professional inspection to find moisture sources and nesting sites is essential.

Odorous House Ants: The Kitchen Invaders

Odorous house ants (Tapinoma sessile) are the small brown-black ants most often found trailing along baseboards and across kitchen counters in NYC apartments. They are 1/16 to 1/8 inch long and emit a distinctive rotten coconut smell when crushed — hence the name. Unlike carpenter ants, they are primarily a nuisance pest rather than a structural threat.

Odorous house ants forage aggressively for sweets and proteins and can establish large colonies with multiple queens inside wall voids, under flooring, and behind appliances. In NYC multi-unit buildings, infestations frequently spread between units through wall penetrations and utility chases. Treating one apartment while neighboring units are untreated often leads to reinfestation.

Effective treatment uses gel bait formulations that workers carry back to the colony, combined with crack and crevice applications at entry points. The key to long-term control in NYC apartment buildings is coordinating treatment across multiple units simultaneously.

Pavement Ants: The Sidewalk and Foundation Species

Pavement ants (Tetramorium immigrans) are small brown ants (about 1/8 inch) that nest under sidewalks, driveways, and building foundations — common sights across every NYC neighborhood. They enter structures through cracks in foundations and expansion joints, foraging for food particularly in kitchens and storage areas at ground level.

Pavement ant colonies can number in the thousands, and multiple colonies often compete aggressively in NYC urban environments where concrete surfaces are dense. Treatment focuses on exterior perimeter applications and targeting nesting sites at foundation level, supplemented with bait placements inside the structure.

NYC-Specific Challenges: Dense Buildings and Multi-Unit Spread

One of the defining challenges of ant control in New York City is the density of the housing stock. Row houses, pre-war apartment buildings, co-ops, and condos share walls, floors, and utility chases that provide highways for ants to travel between units. An ant infestation on the fourth floor of a Manhattan building may originate from a colony two floors below.

This is why professional treatment in NYC must include not just targeted application in the affected unit but also inspection of adjacent spaces and communication with building management about coordinated treatment across the building.

When to Call a Professional

Store-bought ant sprays and bait stations can suppress light surface activity but rarely eliminate established colonies in NYC buildings. If you are seeing ants regularly after two weeks of DIY treatment, or if you have identified large carpenter ants near wooden structural elements, call Control Exterminating at (212) 696-4164. With over 53 years of NYC pest control experience, our technicians know how to find the source and eliminate it.