LIBKnowledge ledger

NYC property compliance resources

Guides for owners, managers, and boards on NYC violations, permits, and compliance workflows. Informational only — not legal or engineering advice.

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How the library is filed

Guides are grouped by agency and topic — DOB, HPD, ECB/OATH, FDNY, and DOT/DEP — so you can open the violation, permit, or program on the property instead of searching generic building-code pages.

Informational only. Not legal, engineering, architectural, or filing advice. Property-specific decisions belong with a licensed professional.

HPD Guides

HPD Violation Classes Explained

Understand Class A, B, and C violations, correction deadlines, and penalties.

HPD Class C Violations

What makes a violation "Immediately Hazardous" and how to handle ERP charges.

HPD Heat and Hot Water Requirements

Essential rules and fines for providing heat in NYC.

HPD Lead-Based Paint Violations

Learn about lead paint rules and abatement procedures.

DOB Guides

DOB Violation Classes Explained

Understand the difference between Class 1, 2, and 3 DOB violations.

BIS vs. DOB NOW

Understanding NYC's two main building systems and where to file.

Certificate of Occupancy (CO)

What it is and the difference between a CO and a TCO.

Working Without a Permit

The severe consequences of unpermitted work and how to legalize it.

NYC Permit Types 101

Guide to different DOB permit requirements.

Stop Work & OATH

The Complete Guide to SWOs

What triggers a Stop Work Order, full vs partial, and how to get it lifted.

OATH Default Penalties

What happens when you miss an OATH hearing and how much it costs.

Certificate of Correction

Why paying a fine isn't enough to close a violation.

DOB Violation Search Guide

How to find open violations and SWOs affecting your property.

More NYC Compliance Guides

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