NYC building compliance is split across multiple city agencies, and the divisions are not intuitive. Owners regularly send filings to the wrong agency, contest violations to the wrong tribunal, and spend time confused about which department is doing what to their building. A short, practical reference.
DOB — Department of Buildings
DOB regulates the physical building: how it was constructed, how it operates, how it is altered. Most of the local laws people associate with NYC compliance — LL97, LL11/FISP, LL84, LL87, LL126, LL152 — are administered by DOB.
DOB jurisdiction includes:
- Building permits and certificates of occupancy.
- Construction code compliance.
- Periodic inspection programs: facade (LL11), parapet (LL126), gas piping (LL152), elevators, boilers.
- Energy and emissions: LL97 reports, LL87 audits, LL84 benchmarking submissions.
- Building-system safety: elevators, hoists, cranes, scaffolds, sidewalk sheds.
If your violation is about something built into the building — its structure, its systems, its energy or emissions — it is almost certainly DOB.
HPD — Housing Preservation and Development
HPD regulates the habitability of multi-family rental housing. Where DOB asks "is the building safe?", HPD asks "is the unit livable?".
HPD jurisdiction includes:
- Housing maintenance code violations: heat, hot water, repairs, conditions inside units.
- Multifamily property registration.
- Lead paint (Local Law 31, Local Law 1) — this overlaps with DOB but the housing-side enforcement is HPD.
- Indoor allergens (Local Law 55).
- Mold remediation in occupied housing.
- Tenant harassment and lockout referrals.
- Affordable housing and rent regulation oversight (in coordination with DHCR).
If your violation is about a condition inside an occupied unit — heat, leaks, mold, pests, lead paint — it is HPD.
DEP — Department of Environmental Protection
DEP regulates water, sewer, air emissions, asbestos, and noise. Many owners forget DEP exists until they get a stop-work order over an asbestos investigation.
DEP jurisdiction includes:
- Water and sewer: meters, billing, shutoff, backflow prevention.
- Cooling tower registration and Legionella (under LL77 and DOH coordination).
- Air permits: for boilers above certain capacities, generators, kitchen exhaust.
- Asbestos: ACP-7 filings before any work that could disturb asbestos-containing materials.
- Noise code enforcement.
- Hazardous materials reporting.
If your violation is about what comes out of the building or what is being released during work — air, water, asbestos, noise — it is DEP.
DOH — Department of Health
DOH coordinates with DEP on cooling towers and Legionella, manages restaurant inspections, and handles certain public health matters. For most building owners, DOH only appears in cooling tower work and food-establishment compliance.
FDNY — Fire Department
FDNY regulates fire safety: standpipes, sprinklers, fire alarm systems, fire pumps, fire safety plans, and emergency action plans. FDNY runs its own inspection program and its own violation tribunal coordinated through OATH.
If your violation involves fire suppression, fire alarms, or evacuation — it is FDNY.
DSNY — Sanitation
DSNY enforces commercial waste rules, recycling compliance, and the new commercial waste zone obligations rolling out citywide. Owners of buildings with commercial tenants increasingly see DSNY violations for waste handling.
Where the seams cause confusion
The agencies divide cleanly on paper, less cleanly in practice.
Lead paint. HPD enforces in occupied units (LL31, LL1). DOB enforces during construction (RRP rules for renovations disturbing lead). DEP can be involved if abatement creates dust outside.
Mold. HPD for habitability inside occupied units. DOL (state) for licensing of remediators. DEP for site air quality during remediation.
Cooling towers. DOB for registration. DOH for Legionella and the MPP. DEP for water and air aspects.
Boilers. DOB for periodic inspection. DEP for air permits if above the threshold. FDNY if oil storage is involved.
Construction work. DOB for permits and code. DEP for asbestos and noise. FDNY for fire-safety review of plans.
A complex piece of work — say, a boiler replacement in a commercial-mixed-use multifamily — can involve all five agencies before it is over. The good general contractors and expediters know how to sequence these. The ones who don't get owners into trouble.
Where to file what
A short reference for the most common filings:
| Filing | Agency | Portal | | --- | --- | --- | | LL97 emissions report | DOB | DOB NOW: Safety | | LL84 benchmarking | DOB (via EPA) | Energy Star Portfolio Manager | | LL87 EER and RCx | DOB | DOB NOW: Safety | | LL11 / FISP TFR | DOB | DOB NOW: Safety | | LL126 parapet observation | DOB (records) | Owner-retained | | LL152 gas piping cert | DOB | DOB NOW: Safety | | LL77 cooling tower reg | DOB | DOB NOW: Cooling Towers | | Legionella sampling cert | DOH | DOH portal | | HPD property registration | HPD | HPD eRegistration | | HPD violation cure | HPD | HPD eCertification | | OATH hearing for any NOV | OATH | OATH ePortal |
When in doubt, the BIN search on DOB NOW shows all current DOB filings on a building, and the HPD Online property page shows all HPD violations and registrations. Use those as starting points.
For owners managing multi-agency exposure across a portfolio, LLDesk maps each obligation to the right agency, the right portal, and the right deadline so the inter-agency complexity stops being a memory game.
Key takeaways
- DOB regulates the physical building. HPD regulates habitability of rental housing. DEP regulates environmental impacts.
- FDNY handles fire safety. DOH handles cooling towers (with DEP) and public health.
- The seams between agencies are where most owner confusion happens — lead paint, mold, cooling towers, asbestos.
- Filing portals differ by filing type. DOB NOW: Safety handles most periodic compliance.
- Use BIN-based searches on DOB NOW and HPD Online as the canonical sources for current building status.