How do I keep rats out of my NYC apartment building?

Keeping rats out of an NYC building requires systematic exclusion — sealing every opening larger than 1/2 inch in the building exterior and foundation with metal-based materials (not foam). Install door sweeps with metal bottoms on all basement and ground-level exterior doors. Repair or replace damaged floor drains and sump covers. Maintain proper trash storage in covered rigid containers. Professional exclusion inspection identifies entry points that property owners typically miss.

What repels rats in NYC?

No single repellent product reliably keeps rats away from NYC properties with consistent food and harborage conditions. Electronic ultrasonic devices, peppermint oil, and similar products have not demonstrated effectiveness in peer-reviewed studies or professional field experience. The only reliably effective rat deterrents are structural exclusion (sealing entry points), sanitation (eliminating food and harborage), and professional rodenticide programs that reduce the local population.

Are there NYC rules about rat prevention for buildings?

Yes. NYC property owners are required under the NYC Health Code and Administrative Code to maintain their properties free from rats and to correct rat harborage conditions. The NYC Department of Health issues rat violation notices and can fine property owners who fail to correct conditions. The NYC Department of Sanitation has rules about proper trash storage and containerization. Properties with active DOH rat violations must document corrective actions within the violation compliance timeframe.

How do I report rats in my NYC building?

Tenants in NYC rental buildings should report rat problems to the landlord in writing first. If the landlord does not respond, file a complaint with the NYC Department of Housing Preservation and Development (HPD) via HPD Online or by calling 311. For outdoor rat activity on public property (sidewalks, parks), call 311. For restaurant-related rat sightings, file a complaint with the NYC Department of Health. All 311 complaints generate an inspection.

Do rats come out during the day in NYC?

Rats are primarily nocturnal, but seeing rats during the day — particularly in outdoor areas with abundant food — is common in NYC neighborhoods with high rat densities. Daytime rat activity often indicates a large, stressed population that has depleted available nighttime food resources. Regular daytime rat sightings near a building are a strong indicator that professional pest control intervention is needed immediately.

Does Control Exterminating do rat exclusion work in NYC?

Yes. Control Exterminating provides comprehensive rodent exclusion services for NYC properties, including professional inspection of all exterior potential entry points, material specifications for sealing gaps, and coordination with building owners on structural repairs. We apply EPA-registered rodenticides in tamper-resistant exterior stations and provide service documentation required for HPD violation compliance. Call (212) 696-4164 to schedule a rodent exclusion inspection.

Rat Prevention Tips for NYC Homes & Businesses

Preventing rat infestations requires a combination of exclusion, sanitation, and professional treatment. Follow these expert tips to keep rats out of your NYC property.

Preventing rats in New York City is a different challenge than preventing rats in most other cities. NYC's Norway rat population is enormous, well-fed by the city's food-waste infrastructure, and housed in a sewer and subway network that runs beneath every block. For property owners and building managers, rat prevention is not a one-time project — it is an ongoing program that combines structural exclusion, sanitation management, monitoring, and professional pest control. This guide covers the specific measures that work in NYC's urban environment, both for residential properties and commercial operations.

Exclusion: The Foundation of Rat Prevention

Norway rats can squeeze through any opening larger than 1/2 inch — approximately the diameter of a quarter. Effective exclusion means systematically identifying and sealing every gap of this size or larger on the building exterior. In NYC's dense building stock, the most common entry points are:

Foundation gaps and cracks: Mortar deterioration in older brick foundations, particularly in buildings more than 40 years old throughout the five boroughs, creates gaps that rats exploit. Concrete patching with rodent-proof materials (not foam alone — rats chew through foam) is required.
Pipe and utility penetrations: Any pipe, conduit, or cable that enters the building through the exterior wall or foundation must be sealed around the penetration with steel wool packed into the gap and covered with caulk or metal flashing. Rats follow utility lines into buildings regularly.
Door sweeps and door frames: The gap under commercial loading dock doors, delivery entrances, and even residential building basement doors is a primary rat entry point in NYC. Door sweeps with metal bottom sweeps (not rubber alone) and properly fitted door frames prevent rat entry that occurs on every NYC block nightly.
Sewer and drain connections: Floor drains, sump pits, and cleanout caps that are damaged, missing, or corroded allow rats to enter from the sewer system directly. Regular inspection and replacement of damaged drain hardware is essential for buildings in older neighborhoods.

Sanitation: Eliminating What Attracts Rats

Sanitation is the second pillar of rat prevention. NYC's rat population thrives on the city's food waste — outdoor restaurants, trash collection points, uncovered garbage cans, and improper food storage all sustain rat populations that then pressure nearby buildings. Property-specific sanitation measures include:

Proper trash storage: Use rigid, covered metal or heavy plastic trash containers rather than bags alone on the sidewalk. In NYC, the NYC Department of Sanitation and the Department of Health have issued guidance on containerized trash — proper containers dramatically reduce rat foraging opportunities at your property.
No overnight garbage exposure: For residential buildings, put trash out as close to collection time as practical rather than overnight. For commercial operations, refrigerate food waste or use secured internal storage between collection days.
Eliminate harborage conditions: Rats need shelter as well as food. Eliminate debris piles, wood piles against building foundations, overgrown vegetation at the building perimeter, and storage under decks or porches. Keep the building perimeter clear of materials that provide nesting cover.
Food storage in commercial operations: All food stored off the floor in sealed containers. Regular cleaning under and behind refrigeration equipment, particularly reach-in coolers and walk-in refrigerators where grease and food debris accumulate along base rails.

Monitoring: Knowing Before You Have a Problem

Early detection is far less expensive than remediation of an established rat infestation. Monitoring measures include:

Regular inspection of building perimeter for fresh burrow activity (fresh soil disturbance, smoothly worn pathways in vegetation, gnaw marks on wood near the foundation)
Snap trap or glue board monitoring in basement areas and near known high-risk entry points
Professional monitoring stations with tracking medium (wax blocks that show gnaw marks when visited by rodents) placed at exterior foundation perimeter
Regular review of NYC 311 rat complaint data for your block — neighborhoods with high complaint rates should implement more aggressive prevention programs

Professional Rodent Control: When to Call

Property owners who find any of the following should call a licensed pest management professional immediately:

Live or dead rats on the property
Fresh rat burrows along the building foundation or in nearby soil
Fresh rat droppings (spindle-shaped, about 3/4 inch long) near the building interior or exterior
Gnaw marks on wood, food packaging, or utility lines
An HPD or DOH rat violation notice

A professional rodent control program for NYC properties includes licensed rodenticide application in tamper-resistant exterior stations, exclusion recommendations with structural repair guidance, and documentation needed to satisfy HPD and DOH requirements. Control Exterminating has provided these services throughout New York City since 1973.

NYC-Specific Resources

NYC property owners can access rat activity data for their neighborhood through the NYC Rat Information Portal at rat.nyc.gov. The portal maps 311 rat complaints and inspection results by block, allowing property managers to see real-time rat pressure around their buildings. The NYC Department of Health also maintains a Rat Academy educational program providing guidance on property-level rat prevention best practices.

Why Choose Control Exterminating?

Control Exterminating has served New York City since 1973 — over 53 years of experience treating every pest NYC throws at us. Our licensed technicians know how pests move through NYC's dense housing stock, aging infrastructure, and commercial corridors. Whether it's German cockroaches spreading between apartment units, Norway rats exploiting the sewer system, or bed bugs hitchhiking through a mid-rise building, we've seen it all and eliminated it all. Call us at (212) 696-4164 or book online for fast, discreet service across all 5 boroughs, Nassau, Suffolk, and Westchester.