The New York City Department of Buildings (NYC DOB) is the city agency that regulates construction, permits, and building safety across all five boroughs — Manhattan, Brooklyn, Queens, the Bronx, and Staten Island. Established in 1892, the DOB is one of the oldest continuously operating building-code agencies in the United States. Every renovation permit, HIC-licensed contractor verification, filing-class designation, Local Law 97 carbon report, Local Law 11 facade inspection, and Local Law 152 gas periodic inspection ultimately routes through the DOB or a sister agency in its orbit. No permit from DOB means no legal renovation in NYC, with narrow exceptions for purely cosmetic work such as paint, flooring over an existing substrate, and cabinet replacement without plumbing or electrical changes. Full agency index: https://www.nyc.gov/site/buildings/index.page.
DOB NOW, BIS, and the two lookup systems
DOB operates two overlapping public systems, and any homeowner or contractor researching a property must check both. DOB NOW is the modern permit filing and lookup portal that launched around 2019; it covers post-2019 permit applications, ongoing filings, inspections, and most current enforcement records. BIS (Building Information System) is the legacy portal that still holds pre-2019 permits, older complaint records, certain violation histories, and certificate-of-occupancy data that has not been migrated. A homeowner checking a property for prior work must query both BIS at https://a810-bisweb.nyc.gov/bisweb/bsqpm01.jsp and DOB NOW to assemble a full history. Additionally, DOB's permit and complaint records do not include HPD lead-paint violations, which live in a third system at the Department of Housing Preservation and Development. None of these data stores single-sources a NYC building's full regulatory state.
Permit types — Alteration Type 1, 2, 3, LAA, EUP
DOB permits are tiered by scope, and the correct filing type dictates cost, timeline, and which professional must sign and seal the drawings. Alteration Type 1 (Alt-1) is a major alteration that includes any change of use, change of occupancy, or change of egress — converting a commercial floor to residential, adding a dwelling unit, or re-carving the fire-stair layout all require Alt-1, which demands either professional certification or a full plan examination by a DOB plan examiner. Alteration Type 2 (Alt-2) covers alterations to structural, mechanical, plumbing, or electrical systems that do not change the use, occupancy, or egress; Alt-2 is the single most common filing for kitchen remodels, bathroom remodels, and whole-unit interior renovations in co-ops and condos. Alteration Type 3 (Alt-3) is minor work involving only one trade, typically a curb cut, a construction fence, or a standalone sign. The Limited Alteration Application (LAA) is a streamlined filing for specific plumbing, electrical, sprinkler, or standpipe-only work done by a licensed master of that trade. The Equipment Use Permit (EUP) covers ongoing operation of elevators, boilers, refrigeration systems, and similar regulated equipment. Most NYC kitchen-plus-bath remodels file as Alt-2; a loft conversion or a commercial-to-residential change files Alt-1.
HIC licensing via DCWP (not DOB)
A common homeowner misconception is that NYC contractor licensing happens at the DOB. It does not. The Home Improvement Contractor (HIC) license — the license every residential remodeling contractor in New York City must hold to legally perform work valued at more than $200 in a private home — is issued and enforced by the Department of Consumer and Worker Protection (DCWP, formerly known as DCA, the Department of Consumer Affairs). DOB regulates the building; DCWP regulates the contractor. When verifying a NYC renovation contractor, a homeowner must check (a) HIC status at https://www.nyc.gov/site/dcwp/index.page, (b) any prior DOB complaints filed against work at the property, (c) any prior stop-work orders, and (d) the contractor's history of closed permits versus open-forever permits. A contractor without an active HIC license cannot legally take more than a $200 residential job in NYC, and a homeowner who hires one loses most of the consumer-protection rights the HIC framework provides.
Filing class — architect vs engineer vs homeowner
NYC permits require a licensed professional of record, referred to as the "filing class." A Registered Architect (RA) or Professional Engineer (PE) typically signs, seals, and stamps the drawings submitted to DOB. For very limited scopes, a homeowner may self-file under narrow rules, but this is rare, triggers additional DOB inspections, and is generally not available for structural, plumbing, or electrical work. For anything structural — removing a bearing wall, cutting a new opening in a slab, adding a rooftop bulkhead — a Professional Engineer is usually required because PEs carry the structural-calculation authority. For aesthetic and layout changes that do not touch structure — interior partitions, finish upgrades, non-bearing wall moves — a Registered Architect commonly files. The filing-class decision affects cost (PE stamps typically run higher than RA stamps), timeline (structural review adds weeks), and liability (the filing professional carries personal professional-liability exposure on every sealed drawing). It is not a procedural rubber stamp.
Local Law 97 + 11 + 152 — the NYC compliance triad
Three local laws every NYC property owner should know, because they drive both capital-reserve assessments in multifamily buildings and renovation scoping decisions in individual units. Local Law 97 is the carbon emissions cap for buildings 25,000 square feet and larger, with enforcement penalties that began in 2024 at $268 per metric ton of CO2-equivalent over the building's cap, rising through the 2030 and 2035 compliance periods; LL97 is driving heat-pump retrofits, submetering projects, and envelope upgrades across mid-size and large NYC buildings. Full LL97 guidance: https://www.nyc.gov/site/buildings/codes/local-law-97.page. Local Law 11, also known as the Facade Inspection Safety Program (FISP), requires a mandatory facade inspection every five years for every building six stories or taller, with the building owner filing a Critical, Safe-with-a-Repair-and-Maintenance-Program, or Unsafe report per cycle; full FISP guidance: https://www.nyc.gov/site/buildings/codes/facade-isp.page. Local Law 152 requires natural-gas piping periodic inspection every four years by a licensed master plumber. For homeowners in condos or co-ops inside larger buildings, these three laws translate directly into special assessments, capital-reserve contributions, and sometimes forced interior-unit participation in heat-pump or gas-line upgrades.
NYCECC — NYC's energy code
NYCECC is New York City's energy conservation code, effectively the local version of the International Energy Conservation Code (IECC) combined with ASHRAE 90.1. It governs envelope performance, HVAC efficiency, lighting power density, and water-heating efficiency. NYCECC is updated on a roughly three-to-four-year cycle; the current code is the 2020 edition, adopted in 2022, with a 2025 update in progress. For most Alt-2 interior remodels, NYCECC compliance is checked at DOB plan review via an energy analysis prepared by the filing RA or PE. NYCECC non-compliance is one of the most common reasons otherwise simple Alt-2 filings get kicked back for revision.
How AskBaily verifies NYC contractors
Every NYC homeowner-to-GC match that AskBaily brokers verifies four points before a contractor ever contacts a homeowner: (a) HIC active at DCWP, (b) prior DOB permit history showing closed permits on file, (c) no pending DOB complaints or stop-work orders on the contractor's recent projects, and (d) demonstrated ability to file an Alt-2 with an RA or PE of record already on the contractor's bench. Match failure on any of the four aborts the routing before the homeowner ever sees the contractor — a screening standard intentionally tighter than what an open-marketplace lead aggregator performs.