Reference
DOB Class 1 violations, and every other NYC violation class. One page.
The city uses two ranking systems. DOB/ECB counts 1 to 3, worst first. HPD uses letters, worst last. Here are both, with the money and the deadlines.
DOB / ECB classes: 1, 2, 3
Cure date: no
Cure date: some codes
Cure date: yes
Penalty ranges are set in DOB's penalty schedule (1 RCNY §102-01). Repeat and aggravated violations cost more. How the hearing, the penalty and the balance due work is on the ECB violations page.
The DOB Class 1 violation and AEUHAZ1
Class 1 is the one that hurts. You can't cure it early, so the case always goes to a hearing. And if you don't file an accepted Certificate of Correction, DOB writes a second violation, AEUHAZ1: failure to certify Class 1, with its own $5,000 penalty. There are about 159,000 AEUHAZ1 violations on record, which tells you how often owners fix the condition and forget the paperwork.
Cure dates for Class 2 and 3
Every Class 3 violation, and Class 2 violations the penalty schedule marks curable, gets a cure date printed on the summons. If DOB accepts your Certificate of Correction before that date, there's no penalty and no hearing. Go by the date printed on your violation.
HPD classes: A, B, C, I
| Class | What it means | Time to correct | On record |
|---|---|---|---|
| A | Non-hazardous | 90 days | 2.52M |
| B | Hazardous | 30 days | 5.16M |
| C | Immediately hazardous | 24 hours (some exceptions) | 2.53M |
| I | HPD Orders (repair, repair/vacate) | n/a | 0.81M |
Class C exceptions: heat and hot water must be fixed immediately, while lead-based paint, window guards, mold and pests get 21 days. Service generally counts as complete five days after HPD mails the notice. To check HPD records on a single building, use the HPD violations search. Full detail, with real code examples, at HPD violation classes.
DOB violation categories aren't classes
Plain DOB violations (not ECB) don't have a severity class. They have a type code: E for elevator, LL6291 for boilers, FISP for facades and so on. See the full DOB violation codes table.
To answer which class is my violation?, search the address: ECB records show the severity class, HPD records show the letter.
Last checked against nyc.gov and 1 RCNY §102-01: October 23, 2026. Counts: NYC Open Data, June 2026.
Common questions
Violation classes: common questions
Short answers first. Still stuck? Call (347) 201-2336 and a person picks up.
What is the DOB penalty schedule?
The DOB penalty schedule is the Buildings Penalty Schedule in 1 RCNY §102-01, the rule that lists each violation DOB can charge with its class, whether it can be cured or settled by stipulation, and its standard, mitigated, default and aggravated penalty. DOB publishes it as a PDF on nyc.gov. Find the section of law printed on your summons in the table to see what a hearing, a default or a repeat would cost.
What is a DOB Class 1 violation?
An ECB violation DOB considers immediately hazardous: the conditions where someone could get hurt today. Penalties start at $1,000 and go to $25,000. There's no cure period. Correct it right away and file a Certificate of Correction, or DOB adds an AEUHAZ1 "failure to certify" violation with a $5,000 penalty.
Is a Class 1 worse than a Class C?
They're different systems. Class 1–3 are DOB/ECB severity levels. Class A, B, C (and I) are HPD housing code classes. Both put the most dangerous conditions at the top: Class 1 for DOB, Class C for HPD.
What does "aggravated" mean on an ECB violation?
Aggravated I and II mark repeat or especially serious violations. They carry higher penalties, and Aggravated II violations can't be cured early even if the code would normally allow it.
What is HPD Class I?
HPD lists its Orders, such as Orders to Repair and Orders to Repair/Vacate, on the violation list with a hazard class of I. They're not A, B or C housing code conditions. There are over 800,000 on record.
Where do I see the class on my violation?
ECB records show "severity" (CLASS - 1, 2 or 3). HPD records show the class letter. Both appear in the search results on this site.