The ceiling leaks, the wall is black, and the landlord says it is cosmetic.

RPL § 235-b · NYC LOCAL LAW 55 OF 2018

Why leaks and mold are habitability breaches.

Real Property Law § 235-b, which reads an implied warranty of habitability into every New York residential lease, covers conditions that are detrimental to life, health, or safety. Active water intrusion and mold growth qualify: damp walls and ceilings invite structural damage and electrical hazards, and mold is a recognized respiratory irritant, especially for children, the elderly, and anyone with asthma. A landlord who knows of a leak and lets it continue, or who paints over mold rather than removing the moisture source, is in breach.

In New York City, the obligation is more specific. Local Law 55 of 2018, often called the Asthma-Free Housing Act, treats mold and pests as indoor allergen hazards. It requires owners of multiple dwellings to inspect units annually for mold and pest conditions, to remediate them using safe work practices, and to correct the underlying moisture condition that caused the mold, not just wipe the surface. Mold violations issued by HPD are classified by the size of the affected area, with larger areas treated as hazardous or immediately hazardous conditions. The practical effect is that "we painted it" is not compliance; the leak has to be found and fixed.

The statewide framework, including the order of steps and the retaliation protections, is on our landlord repairs hub.

Documenting a leak so it cannot be painted over.

Leaks and mold are the conditions most likely to be "fixed" cosmetically the day before an inspection. Your record has to survive that. Start now:

• Photograph and video with dates. Wide shots that show the room, then close-ups. Capture active dripping on video. Your phone timestamps files; also put a dated newspaper or your phone's lock screen in the frame for anything important.
• Measure the area. Hold a tape measure against mold growth. Violation classes and abatement percentages both scale with size.
• Log every event. Date, time, weather (leaks that follow rain point to roof or facade), what was wet, what was damaged. Note every call, text, and visit from the super.
• Keep damaged property. Ruined clothes, a warped dresser, a destroyed mattress: photograph, record replacement cost, keep receipts. These are damages separate from the abatement.
• Write to the landlord, dated, every time it recurs. Each notice should reference the earlier ones. A chain of six emails over four months, each unanswered or answered with a promise, is the core of your case.
• Medical records. If anyone in the household has had respiratory symptoms, ask the doctor to note the home conditions. This is not required for an abatement, but it matters for the percentage and for any separate health claim.

Then call 311 and request an HPD inspection for the leak and for mold. Ask for the inspection even if the landlord has scheduled a repair; a violation on record fixes the date and the condition in a way no later paint job can erase.

The health side, stated carefully.

We are lawyers, not physicians, and an abatement claim does not require proof of illness. But the reason courts treat mold seriously is the health dimension: mold exposure is associated with asthma exacerbation, allergic reactions, and respiratory irritation, and the City's Local Law 55 exists precisely because of childhood asthma rates in damp housing. If a household member has developed or worsened symptoms, keep the medical records and tell us. A personal injury claim for mold exposure is a different and harder case than an abatement; it requires medical causation evidence, and we will tell you candidly whether the facts support one. Most tenants are better served by getting the leak fixed and the rent reduced than by litigating causation.

What the abatement looks like for a leak.

An abatement is a percentage reduction in rent for the period the condition persisted after the landlord had notice, sized to how much of the apartment was impaired. A leak that took one bedroom out of use is different from a drip in a closet. Some illustrations, not predictions:

• Rent of $2,400; a bedroom ceiling leak with visible mold made the room unusable for four months after notice. An abatement in the range of 20 to 35 percent for those months is roughly $1,900 to $3,400.
• Rent of $3,200; a bathroom leak and mold behind the vanity, usable but unpleasant, three months after notice. A lower-range abatement of 10 to 15 percent is roughly $960 to $1,440.

Add the replacement value of damaged property, and a months-long leak becomes a claim that is worth pursuing and that a landlord would rather settle than try. The mechanics of how judges set these percentages, and how to demand one in writing, are at rent abatement under the warranty of habitability.

What an attorney demand letter does here.

A demand letter for a leak or mold condition does three things a 311 complaint cannot. It sets out the full notice chronology, which is what establishes the start date of the abatement period. It frames the condition under RPL § 235-b and, in NYC, under Local Law 55, which means the landlord's lawyer sees the statutory exposure immediately. And it demands specific relief by a date: investigation and permanent repair of the moisture source, professional mold remediation using safe work practices, reimbursement for damaged property, and a stated rent abatement for the period already elapsed. The letter makes clear that an HP action and an abatement claim follow if the deadline passes.

Landlords who have ignored a tenant for months frequently respond to this within days, because a letter that lists an open HPD mold violation and a documented four-month notice history is a preview of what a Housing Court judge will read. Settling for the repair and a rent credit is the rational response. We send these for a flat fee through DemandLetterNY; see flat-fee demand letters for how the process works.

When a letter is not the right move: if water is actively pouring through an electrical fixture, call 311 and, if needed, 911; that is an emergency, not correspondence. If the leak originates from a neighbor's apartment and your landlord is genuinely working to gain access, a letter may be premature, though your notices should continue. And if you have already moved out and the only issue is money, a small claims case may be the more direct route, with a letter as the step that often settles it first.

Do not stop paying rent over a leak.

The same warning we give on every repairs page applies with extra force to mold, because mold cases turn on documentation and a tenant who has withheld rent gives the landlord a simpler story to tell. Keep paying, keep documenting, and claim the abatement affirmatively. If you are considering withholding, talk to a lawyer first and, if you do it, set aside every dollar. Retaliation for your complaints is prohibited by Real Property Law § 223-b, so the complaint history itself is not a reason to hold back.

Related problems and next reads.

Leaks in winter often arrive with heating failures from burst or frozen pipes; see no heat or hot water in NYC. If you are weighing whether to file an HP action yourself, read HPD complaint vs. demand letter. Tenants outside the five boroughs have the same warranty and a different enforcement path: landlord repairs outside NYC.