The four classes, worst first
The Housing Maintenance Code is about living in a building — heat, hot water, pests, paint, mould — and it is a different thing from the Department of Buildings violations that are about building work. A violation is written in one of four classes, and the class decides how serious the city considers it and how long the owner has.
| Class | What it means | To fix | Open citywide |
|---|---|---|---|
| C — Immediately hazardous | The city considers the condition a danger now. If the owner does not correct it the city may do the work itself and bill them. No heat or hot water in season, lead paint where a child under six lives, a broken smoke detector, rodents, a collapsing ceiling. | 24 hours | 599,145 |
| B — Hazardous | A real defect that is not an emergency. This is the largest class by a long way, and a building with a few is ordinary rather than alarming. Peeling paint, a leaking fixture, a defective window guard, a door that will not self-close. | 30 days | 1,401,638 |
| A — Non-hazardous | Something that should be put right but endangers nobody while it waits. A missing sign, chipped plaster in a common area, an unlabelled mailbox. | 90 days | 686,732 |
| I — Information order | Paperwork. The owner has not told the city something it is required to be told, and the flat itself may be in perfect order. No valid property registration on file, no annual bedbug report filed. | As the order states | 233,920 |
A big number is not a verdict
The two most common open violations in New York are both paperwork: 208,218 for an owner who has not filed a valid property registration, and 190,415 for an unfiled annual bedbug report. Together that is about 14% of every open violation in the city, and neither is something you would notice standing in the flat.
So a building with forty open violations may have a landlord who has not filed a form, and a building with three may have three broken boilers. The count tells you to look; the classes tell you what you are looking at.
“Open” means not yet certified
An open violation is one the Department of Housing Preservation and Development has not recorded as corrected. That is not the same as one nobody has fixed: an owner can repair something and not certify it, and the violation stays open until they do. It also works the other way — a violation can be certified and the problem come back.
The city publishes the apartment each violation was written against. This site does not carry that, on any page: a count says a building has a problem, an apartment number says whose.
Where they are
| Borough | Open violations |
|---|---|
| Brooklyn | 1,223,990 |
| The Bronx | 668,444 |
| Queens | 497,520 |
| Manhattan | 462,187 |
| Staten Island | 69,294 |
Counted from the city’s open-violation extract on Sep 15, 2026. Brooklyn holds more than the Bronx and Manhattan together, which is a fact about where the rented housing is rather than about where the worst of it is.
On this site
1,477 addresses here have been checked against the extract. 448 carry at least one open violation and 281 carry at least one the city calls immediately hazardous. Each building page states its own counts by class.
What to do with it
If something in your own flat is on this list, the violation is the city’s record that it agrees with you — it is worth quoting by number. If nothing is, calling 311 is what puts it there. HPD Online is the city’s own lookup and the authority on any particular violation; this page explains what its answers mean.
How filings work · What each filing status means · Every dataset behind the site