Mice are one of the most common apartment pests in New York City, and if you’ve spotted one, there are almost certainly more. The good news: NYC law is firmly on your side. Your landlord is legally required to keep your apartment free of vermin, and the city has a clear enforcement process if they don’t. Here’s what to do, from sealing entry points tonight to filing complaints that carry real consequences.
Why NYC Apartments Are So Vulnerable
New York’s aging building stock is riddled with gaps mice can exploit. A mouse can squeeze through any opening wider than a pencil. The most common entry points in NYC apartments are around steam pipes and radiator risers, behind the stove where gas lines enter the wall, under baseboard heating units, and wherever cable or electrical wiring passes through walls. In prewar buildings especially, decades of plumbing repairs and renovations leave gaps that were never properly sealed.
Mice travel between apartments through shared walls, pipe chases, and the vertical shafts that run the height of a building. That’s why a mouse problem is rarely limited to one unit. If your neighbor has food sources and you have entry points, you’ll see mice regardless of how clean your apartment is.
How to Seal Entry Points Yourself
The single most effective thing you can do tonight is block every gap you can find. Walk through your apartment with a flashlight and look behind the stove, under the sink, around every radiator pipe, and along the base of every wall. Any opening the width of a pencil or larger is a potential highway.
Steel wool is the go-to material because mice can’t chew through it. Pack it tightly into each gap using a butter knife, pressing until you can’t push any more in. For larger holes, layer heavy-duty duct tape over the steel wool to hold it in place. Copper mesh works the same way and won’t rust, which matters in damp spots under sinks. For permanent seals, combine steel wool with silicone caulk so the plug stays put long-term.
Pay special attention to the quarter-inch gaps where pipes meet the wall behind your stove and under your kitchen sink. These are the two spots mice use most frequently in NYC kitchens. If you have a dishwasher, check behind it too.
Traps, Bait, and What Actually Works
Snap traps remain the most reliable option for apartment use. Place them perpendicular to walls with the trigger end facing the baseboard, since mice run along edges rather than through open space. Peanut butter is the most effective bait because mice have to work at it, which triggers the mechanism. Set at least four to six traps, even if you think you’ve only seen one mouse.
Glue traps catch mice but are widely considered inhumane because the animal dies slowly. Poison bait is risky in apartments because a mouse can eat it and die inside a wall, creating a smell that lasts weeks. Electronic traps deliver a quick kill and are easy to empty if you’d rather not handle a snap trap.
Check traps every morning. If you’re catching mice consistently for more than a week or two, you haven’t found all the entry points, or the infestation extends beyond your apartment and needs building-wide treatment.
Health Risks You Should Know About
Mice aren’t just a nuisance. Their urine, hair, and dander contain allergens that become airborne and settle into carpeting, pillows, bedding, and upholstered furniture. Indoor mouse infestations are a strong risk factor for developing allergic asthma, particularly in urban apartment settings. If you or anyone in your household has asthma or respiratory allergies, a mouse problem can directly worsen symptoms.
Mice also contaminate food and surfaces with their droppings. A single mouse produces 50 to 75 droppings per day, often in kitchen drawers, behind appliances, and along countertops. Store all food in hard plastic or glass containers, including pet food. Wipe counters with a disinfectant solution rather than sweeping dry droppings, which can release particles into the air.
Your Landlord’s Legal Responsibility
Under New York law, every residential lease includes an implied warranty of habitability. Your landlord must keep your apartment livable, safe, and sanitary, and that explicitly includes keeping it free of vermin. This right exists whether your lease mentions it or not, and any lease clause attempting to waive it is void.
Landlords of multiple dwellings are required to keep apartments and public areas clean and free of vermin, garbage, and other offensive material. That means pest control isn’t optional or a favor. It’s a legal obligation. Your first step should always be notifying your landlord in writing (email counts) and giving them a reasonable window to respond. Keep a copy of everything you send.
How to File a 311 Complaint
If your landlord doesn’t act, file a complaint with the city. You can call 311, use 311 Online, or submit through the 311 Mobile app. You’ll get a Service Request number to track your complaint’s status.
Here’s what happens next: HPD (Housing Preservation and Development) contacts your building’s managing agent to warn them that a complaint has been filed and that a violation may be issued if the condition isn’t corrected immediately. HPD will also try to call you back to check whether the problem was fixed. If you say it wasn’t, or if HPD can’t reach you, a uniformed Code Enforcement inspector is sent to your apartment. The landlord is not told the inspection date.
If the inspector confirms the problem, they write a violation. Mice and cockroaches are classified as Class C violations, the most serious category, labeled “immediately hazardous.” That puts them in the same tier as lead paint, mold, and missing window guards. Once served, your landlord has 21 days to correct the condition.
Legal Options if Your Landlord Won’t Act
A Class C violation with no correction isn’t the end of the road. You have several legal tools available.
- Rent reduction through DHCR: If you’re in a rent-regulated apartment, you can file a rent-reduction complaint with the Division of Housing and Community Renewal. You must first send your landlord written notice of the problem, then wait at least 10 days (but no more than 60 days) before filing. If DHCR finds the landlord violated the warranty of habitability, your rent can be reduced by an amount reflecting the diminished value of the apartment.
- Lawsuit for rent abatement: Any tenant, rent-regulated or not, can sue for a rent reduction in court. The reduction is calculated by subtracting the estimated value of the apartment without essential services from the actual rent.
- Withholding rent: You can withhold rent, though be aware your landlord may respond with a nonpayment lawsuit. In that case, you can countersue for breach of the warranty of habitability. This is a legitimate legal strategy, but it’s confrontational and works best with documentation showing you reported the problem and the landlord failed to act.
- Repair and deduct: In serious situations, tenants may hire an exterminator themselves and deduct the reasonable cost from rent. This remedy is reserved for extenuating circumstances and works best when you can show the landlord refused or ignored repeated requests.
For any of these options, documentation is everything. Photograph droppings, save all written communication with your landlord, and keep your 311 Service Request number. Date-stamped photos and a paper trail of ignored complaints are what turn a frustrating situation into a winnable legal case.
Building-Wide Problems Need Building-Wide Solutions
If mice are coming through shared walls and pipe chases, no amount of trapping in your unit alone will solve the problem permanently. Effective rodent control in a NYC apartment building requires sealing entry points in the basement and ground floor, treating common areas, and addressing conditions in neighboring units. This is your landlord’s responsibility, not yours.
When you file your 311 complaint, be specific about where you’re seeing mice and how long the problem has persisted. If neighbors are dealing with the same issue, separate complaints from multiple units carry more weight and make it harder for a landlord to claim the problem is isolated. Talk to your neighbors. In a city where mice move vertically through buildings as easily as horizontally, a coordinated push is the fastest way to get results.