When a NYC agency issues a violation, the class drives almost everything that happens next — how fast you have to respond, how big the fine is, and what kind of compounding penalties accrue. The classes are not interchangeable, and "Class A vs. Class B" is the first question to ask when an NOV lands.
The three classes
The NYC violation classification system primarily applies to HPD housing maintenance code violations and to some DOB violation codes. Most agencies follow a parallel structure even where the labels differ.
Class A — Non-Hazardous
Class A violations are conditions that are not immediately dangerous. Examples include cosmetic issues, minor maintenance items, and conditions that affect quality of life but not health or safety.
- Cure period: 90 days
- Typical penalty: $10 to $50 per day if uncorrected
- Examples: peeling paint in non-child-occupied unit, missing bulbs in non-egress areas, cosmetic floor damage
Despite the name, "non-hazardous" doesn't mean "not serious" — repeat Class A violations on the same condition escalate, and patterns of Class A violations across a portfolio attract aggregate enforcement attention.
Class B — Hazardous
Class B violations are conditions that pose a real but not immediate risk. The 30-day cure window is the critical operational fact.
- Cure period: 30 days
- Typical penalty: $25 to $100 per day if uncorrected
- Examples: defective plumbing, faulty wall outlets, defective windows in non-child units, lack of heat below threshold, broken elevators in occupied buildings
Class B is the workhorse of NYC enforcement. The majority of HPD violations issued each year are Class B, and the 30-day clock is what most owners are managing against.
Class C — Immediately Hazardous
Class C violations are conditions presenting immediate danger to occupants. The cure period is short — often 24 hours for safety conditions, up to 21 days for less acute Class C items — and the penalties are severe.
- Cure period: 24 hours to 21 days, depending on the condition
- Typical penalty: $50 to $250+ per day, plus per-violation immediate fines
- Examples: lead paint hazards in child-occupied units, no heat in winter, no hot water, rodent infestations in food-prep areas, structural defects, fire safety failures
Class C violations also typically trigger HPD's Emergency Repair Program — if the owner doesn't fix it in time, HPD does the work and bills the owner at premium rates.
Class versus penalty
Class drives both the cure timeline and the penalty rate. A Class C violation that lingers ten days costs dramatically more than a Class A that lingers ten days. The math:
| Class | Daily Penalty | 30-day Cost | 90-day Cost | | --- | --- | --- | --- | | A | $10–$50 | $300–$1,500 | $900–$4,500 | | B | $25–$100 | $750–$3,000 | $2,250–$9,000 | | C | $50–$250+ | $1,500–$7,500+ | $4,500–$22,500+ |
These are housing-code-style violations. DOB civil penalties for build-code violations have a different schedule, and ECB hearing officers can adjust based on circumstances.
How class affects strategy
For a Class A: cure is straightforward, penalty exposure is modest. Often best to certify by mail or correct and certify if you have the documentation.
For a Class B: 30-day clock is the hard constraint. Cure within 30 days, document, certify cure. If you cannot cure in 30 days, file for an extension before the deadline runs.
For a Class C: drop other priorities. Cure now, document everything, certify the moment work is complete. Class C violations on the books generate ongoing penalties and trigger inspector follow-ups.
Repeat and aggregate violations
A condition cited, corrected, and re-cited within a defined window often re-classifies upward. A Class B that recurs becomes a Class C in some agencies' rules. Three Class A violations on the same condition in 12 months flag the building for elevated scrutiny.
Agencies also look at portfolio-wide patterns. An owner with a clean record at 19 buildings and one with a stack of Class C items doesn't get the same OATH treatment as an owner with Class C items at 14 of 20 buildings.
What to do when an NOV arrives
Regardless of class:
- Read the class. It is on the first page.
- Calendar the cure deadline. Use the issuance date plus the class window.
- Inspect the cited condition. Photograph it the day you receive the NOV.
- Cure if possible, with timestamped photos and contractor invoices.
- Certify cure in the appropriate portal (HPD eCertification for HPD violations; OATH portal for ECB).
- Track the certification. Cure not certified is cure not credited.
For owners with multiple buildings, sorting incoming NOVs by class — and tracking each one to certification — is exactly the kind of administrative work that gets dropped between hands. LLDesk keeps each violation tracked from issuance through resolution alongside the underlying compliance obligation.
Key takeaways
- Class A: 90 days, low penalty rate. Class B: 30 days, moderate. Class C: short window, high rate.
- Class C violations trigger HPD's Emergency Repair Program if uncured — HPD does the work and bills you.
- Repeat violations re-classify upward and accumulate aggregate enforcement attention.
- Calendar every NOV the day it arrives by class. The cure clock starts on issuance, not on receipt.
- Cure not certified is cure not credited. Always certify in the appropriate portal.