NYC Heat, Mold, and Lead Paint Violations: What Renters and Buyers Need to Know

Heat, mold, and lead paint are the three HPD violation categories that show up most often in due diligence — and the three that carry the most legal weight. All three typically land as Class C (immediately hazardous) violations. All three signal something deeper than a broken hinge. This guide breaks down how each one works under NYC law, how violations get issued, and what a pattern of them tells you about a building.

Heat Violations

NYC heat season rules

New York City's heat season runs from October 1 through May 31. During that window, landlords must maintain minimum indoor temperatures under the Housing Maintenance Code (Administrative Code §27-2029):

• Daytime (6 AM – 10 PM): at least 68°F inside whenever the outside temperature drops below 55°F.
• Nighttime (10 PM – 6 AM): at least 62°F inside at all times, regardless of outdoor temperature.

Hot water is a separate obligation — landlords must supply hot water (at minimum 120°F at the tap) 365 days a year, not just during heat season.

How heat violations get issued

The typical path starts with a tenant calling 311 or using the NYC311 app. HPD dispatches an emergency inspector, often within hours for no-heat complaints during cold weather. If the inspector confirms temperatures below the legal minimums, HPD issues a violation under the Housing Maintenance Code on the spot.

The violation goes on the building's permanent record immediately. The landlord doesn't get a warning — the violation is issued, the 24-hour cure clock starts, and the record is public. Tenants in multiple units frequently call 311 independently, so a single boiler failure can generate a cluster of violations for the same date.

Heat violations are almost always Class C

No heat in winter is classified as immediately hazardous under the Housing Maintenance Code, which puts it squarely in the Class C tier. The cure window is 24 hours after notice. Landlords who don't cure within 24 hours can face civil penalties of $250–$500 per violation per day, and HPD can refer the building to the Emergency Repair Program.

Full breakdown of HPD violation classes (A, B, C) →

What repeat heat violations actually mean

A single heat violation in a 10-year building history is a minor flag — boilers fail. What's significant is a pattern: the same building getting heat violations in multiple consecutive winters, or heat violations clustered across several units on the same date year after year.

Repeat heat violations are one of the strongest signals that a landlord is deferring boiler capital investment — operating aging equipment until it fails rather than replacing it. Boiler replacements in a mid-size NYC multifamily can cost $50,000–$150,000+. Landlords who are cash-flow stressed or opposed to capital spending tend to produce exactly this pattern in the public HPD record.

For buyers, a building with five or more heat violations in the last three winters should trigger a boiler inspection and a request for maintenance records before closing.

HPD Emergency Repair Program

When a landlord fails to restore heat and HPD determines tenants are at risk, the city can step in through the HPD Emergency Repair Program (ERP). Under the ERP, the city contracts a private vendor to make the emergency repair — typically restoring boiler function or providing temporary heating equipment — and then bills the landlord for the cost plus administrative fees.

If the landlord doesn't pay, HPD can place a lien on the property. ERP liens are public record. A building with active ERP liens is a building where the landlord has been so unresponsive that the city had to step in and fund repairs itself — one of the strongest red flags on any property record.

Mold Violations

Local Law 55 of 2018 — NYC's mold law

Local Law 55 of 2018 established specific obligations for NYC landlords around indoor mold and allergen hazards. The law requires landlords to investigate and remediate mold conditions in apartments and common areas. It also created a new category of HPD violation — Indoor Allergen Hazard — that covers not just visible mold but also cockroach and mouse allergens.

Under Local Law 55, landlords of buildings with three or more units must:

• Investigate for mold and allergen hazards annually and when a tenant reports a condition.
• Remediate mold conditions following Department of Health and Mental Hygiene (DOHMH) guidelines — which generally require identifying and fixing the moisture source before surface remediation.
• Use a licensed Mold Assessor or Mold Remediation Contractor for large mold conditions (over 10 square feet under state law, DEC Part 945).

How HPD mold violations are classified

Mold violations are typically issued as Class B (hazardous) or Class C (immediately hazardous) depending on the extent and location of the mold condition. A small, contained mold condition in a bathroom may land as Class B; an active mold condition spreading across multiple walls, or a mold condition in a unit with an immunocompromised tenant or infant, is more likely to be Class C.

DOHMH also has authority to issue mold violations independently of HPD, particularly in cases involving health complaints. DOHMH violations follow a separate enforcement track but show up in the building's overall compliance picture.

What mold on a building record actually signals

Mold doesn't appear spontaneously — it follows moisture. When you see a cluster of mold violations on a building's record, you're almost always looking at one of these underlying conditions:

• Roof failure: water infiltrating through a deteriorated roof membrane runs down interior walls and pools at lower floors.
• Plumbing leaks: slow leaks behind walls or ceilings that go unrepaired for months create sustained moisture conditions.
• HVAC condensation: improperly insulated or maintained ductwork generates condensation, particularly in older cast-iron-radiator buildings converted to central air.
• Basement or foundation water intrusion: buildings in low-lying areas of Brooklyn, Queens, and the Bronx are particularly susceptible.

The mold violation is a symptom. The question for buyers and renters is: has the underlying moisture source been repaired, or is the landlord re-treating surface mold while the root cause keeps producing it?

Mold disclosure requirements

New York state requires landlords to disclose known mold conditions to prospective tenants and buyers. Under New York Real Property Law §235-b and the NYC Housing Maintenance Code, landlords cannot knowingly conceal a mold condition that affects habitability. For residential sales, New York's seller disclosure law (RPL §462) requires disclosure of known mold conditions on the Property Condition Disclosure Statement.

In practice, the disclosure statement is only as useful as the seller's honesty. A clean disclosure statement on a building with five open mold violations in the HPD record is a contradiction worth raising during negotiation.

Lead Paint Violations

Local Law 1 of 2004 — the NYC lead paint law

Local Law 1 of 2004 is the primary lead paint law for NYC rental housing. It applies to residential buildings built before 1960 (and buildings built between 1960 and 1978 where the owner has actual knowledge of lead-based paint) that contain a child under the age of 6.

Under Local Law 1, landlords of covered buildings must:

• Conduct an annual visual inspection of each apartment for peeling paint and deteriorated surfaces.
• Provide tenants with an annual notice inquiring whether any child under 6 resides in the unit.
• Remediate any peeling paint or deteriorated surfaces in apartments where a child under 6 resides, using safe work practices defined by the NYC Department of Health and Mental Hygiene.
• File an Annual Bedbug and Lead Disclosure form with HPD (this is separate from the lead-paint obligation itself but part of the same compliance package).

Buildings built after 1978 are generally outside the scope of Local Law 1 because lead paint was banned from residential use in the US in 1978.

Lead paint violations are always Class C

HPD classifies lead paint violations — specifically, peeling paint in an apartment with a child under 6 in a pre-1960 building — as Class C, immediately hazardous. There is no Class A or B path for lead paint in the presence of a young child. The 24-hour cure clock applies, and the violation stays open until HPD verifies the remediation.

This is one of the few HPD violation categories where the cure requirement is ongoing: if lead paint reappears — because the underlying surface continues to deteriorate — the landlord must remediate again. A building with recurring lead paint violations has a lead-paint problem that hasn't been permanently addressed.

Window guard and lead testing requirements

Window guards are legally separate from lead paint but are often enforced together. Buildings with children under 10 must provide window guards on all windows above the first floor. HPD tracks window guard compliance through the same annual disclosure process.

For actual lead testing, the standard method used by HPD inspectors and environmental consultants is XRF (X-ray fluorescence) testing. XRF is a non-destructive method that uses X-ray technology to detect lead content in paint layers without requiring paint samples. An XRF reading above 1.0 mg/cm² is considered positive for lead-based paint under NYC and federal standards.

XRF testing is performed by a New York State-licensed lead inspector. It's faster and cheaper than paint chip laboratory analysis and produces results on-site. Buyers purchasing pre-1960 buildings with families should consider ordering an XRF survey as part of their due diligence — the cost is typically $500–$1,500 depending on building size.

What lead violations mean for buyers

For buyers, open lead paint violations on a building create several layers of exposure:

• Abatement cost: proper lead paint abatement in a pre-1960 NYC multifamily is not cheap. Encapsulation (covering intact lead paint with an approved sealant) costs less than full removal, but removal in a building with extensive lead paint can run $10,000–$30,000+ per unit depending on the number of surfaces affected.
• Liability: a landlord who fails to remediate a known lead paint condition in a unit with a child can face civil liability for lead poisoning-related health damages. Lead poisoning cases in NYC have produced significant jury awards.
• Financing complications: FHA and VA loans have stricter requirements around lead paint in pre-1978 buildings. If lead paint is identified and not remediated, the loan may not close.

A building with five or more open or recently cured lead paint violations should be treated as having a systemic lead paint management problem, not isolated incidents.

How to Check for These Violations on Any Building

All HPD violations — heat, mold, lead paint, and everything else — are public record and searchable through several channels:

• HPD Online (hpdonline.hpd.nyc.gov): the official HPD building search. Look up any address to see open and closed violations, complaint history, and registration status. The interface is functional but shows a lot of raw data without context.
• NYC Open Data: the full HPD violations dataset is published on NYC Open Data and updated daily. Useful for bulk analysis but requires SQL or spreadsheet skills.
• Our audit tool: Run a free property audit on any NYC address to see HPD violations alongside DOB, OATH, and ACRIS records — all in one place, with violation class labels and open/closed status.

The Systemic Deferred-Maintenance Red Flag

Buildings with all three violation types — heat, mold, and lead paint — visible in the same record period are not showing three unrelated problems. They're showing a single underlying pattern: systemic deferred maintenance.

Here's why the combination matters:

• Chronic heat failures mean the boiler is being run until it breaks rather than maintained proactively.
• Mold violations mean moisture intrusion — roof, plumbing, or HVAC — is not being addressed at the source.
• Lead paint violations mean the pre-1960 building's painted surfaces are deteriorating without being properly remediated.

All three are expensive to fix properly. Landlords who defer all three simultaneously are typically doing so because the cost of proper maintenance exceeds what they're willing to spend — or because the building's cash flow doesn't support it. Either way, the public record is telling you something about the building's long-term capital trajectory.

For renters, a building with all three types of open violations is a building where you should expect enforcement problems to continue. For buyers, it's a building where the purchase price should reflect the cost of remediation — or where you should walk away.

Check Any NYC Building's Violation Record

Before signing a lease or making an offer, pull the full HPD violation history. Heat, mold, and lead violations all show up in the same record with class labels and dates — you can see at a glance whether the issues are isolated and old or recurring and recent.

Run a free property audit →