What do I do if I see mice in my Manhattan apartment?

Notify your landlord in writing immediately and file a 311 complaint if the landlord does not respond within a reasonable time. Document evidence with photos. The landlord is legally required to address the infestation.

How do mice get into Manhattan high-rise apartments?

Through the building's utility shafts, plumbing chases, HVAC connections, and any gap at ground level or in the basement. Even upper-floor units are accessible via vertical pipe runs.

What is an HPD rodent violation in Manhattan and how serious is it?

HPD classifies rodent infestations as Class B violations (hazardous). Unresolved HPD violations appear on the property record and can affect the owner's ability to raise rents or transfer the property.

How long does building-wide rodent treatment take?

Initial inspection and exclusion work takes 1–2 visits. Trapping programs run for 2–4 weeks. Full elimination with follow-up verification typically takes 4–6 weeks for a standard Manhattan apartment building.

Mice and Rats in Manhattan Apartments: Complete Guide

Mice and rats in Manhattan apartments are among the city's top 311 complaints. Here's how to eliminate them and keep your building compliant with NYC health codes.

Manhattan is the most densely populated borough in the United States, and that density extends to its rodent population. Mice and rats in Manhattan apartments are so common that rodent complaints consistently rank in the top three 311 categories citywide. From pre-war buildings on the Upper West Side to glass towers in Midtown, every type of residential building is susceptible. Understanding how rodents enter, where they nest, and what building-wide treatment looks like is essential for both tenants and property managers.

How Rodents Enter Manhattan Apartment Buildings

House mice can squeeze through a gap the diameter of a dime — approximately 6mm. Norway rats (the large brown rats of NYC) can squeeze through a gap the size of a quarter. In Manhattan's aging building stock, entry points are abundant: gaps around utility pipes entering from the exterior or basement, damaged door sweeps on building entry doors, gaps in the mortar of brick facade at ground level, and basement-to-apartment connections through hollow walls and pipe chases. Buildings that share walls with restaurants, bodegas, or food-handling businesses are at especially high risk because the adjacent food source draws rodents who then explore neighboring structures.

DOH Rat Violations in Manhattan

The NYC Department of Health and Mental Hygiene (DOHMH) conducts rat inspections and issues Rat Index violations for properties with evidence of active rodent activity. A failed inspection results in a violation notice and a re-inspection within 30 days. Landlords who fail the re-inspection face fines starting at $300 per violation, escalating for repeat violations. Manhattan buildings in designated Rat Indexing zones — primarily in Upper Manhattan, East Harlem, the Lower East Side, and sections of Midtown — face regular DOHMH inspection cycles. Control Exterminating provides documentation of treatment for HPD and DOHMH compliance purposes.

Building-Wide Rodent Treatment Programs

Effective rodent control in a Manhattan apartment building is never a one-apartment job. Our process: (1) Full building inspection to identify all entry points, harborage areas, and active runways; (2) Exterior exclusion — sealing all ground-level entry points with steel wool backed by caulk, hardware cloth over vent openings, and door sweep installation or repair; (3) Interior trapping program in basement and utility areas; (4) Building management receives a written exclusion report for HPD/DOH compliance. Bait stations are used only in locked, tamper-resistant exterior housings — never in occupied apartment areas.