Table of Contents
- Most NYC construction needs a DOB permit filed through DOB NOW by a registered architect or licensed professional engineer; cosmetic work generally does not.
- Landmarks, co-op or condo boards, and tenant protection rules can apply even when the city needs no permit.
- Residential remodeling in NYC requires a Home Improvement Contractor license from the Department of Consumer and Worker Protection.
- Long Island and New Jersey permits are handled by town, village or municipal construction offices, not by the city.
- A new NYC Existing Building Code is set to govern alteration filings from July 17, 2027; current rules apply until then.
Permits are the part of a New York renovation nobody sees on a Pinterest board and everybody remembers when the schedule slips. The rules are not mysterious, but they depend on four things at once: what you are doing, where the building is, who owns the space and what the building's own rules say. A kitchen refresh in a Murray Hill co-op and a bathroom addition to a Queens Village home can need entirely different paperwork, even if the cabinets look similar.
This guide is a roadmap rather than a rulebook. It follows a project from first idea to approval, in the order decisions actually arise, and covers New York City, Long Island and nearby New Jersey. It is current as of October 2026. For the details of specific filings, our pages on NYC renovation permits explained and NYC electrical permits for renovations go deeper.
1. The Four Layers of Approval
Before you sort out which application type applies, understand that approval happens in layers. Missing a layer stops the project even if the others are in order.
- The government layer: the Department of Buildings in New York City, a town, village or city building department on Long Island, or a municipal construction office in New Jersey.
- The landmark layer: the Landmarks Preservation Commission for landmarked buildings and historic districts in the city, with local historic commissions elsewhere.
- The building layer: co-op boards, condo boards, managing agents and landlords, who set alteration agreements, insurance requirements, work hours and elevator rules.
- The professional layer: licensed contractors, design professionals and trade licensees whose credentials the other layers require.
Many owners focus on the first layer and discover the third one late. In a co-op, the board can refuse or delay work that the city would approve, and it can ask for different drawings, insurance or deposits.
2. What Work Needs a DOB Permit in New York City
As a general rule, most construction work in the city requires a Department of Buildings permit. That includes changes to layout and structure, new walls or openings, and most plumbing, gas and electrical work. Cosmetic work generally does not, and that group includes painting, simple flooring replacement and basic finishes. The final word comes from the DOB, so when in doubt check the agency's permit guidance.
| Work | DOB permit usually needed? | Other approvals to check |
|---|---|---|
| Interior painting, minor repairs | Generally no | Building rules, landlord |
| Replacing flooring only | Generally no | Co-op or condo rules, sound rules |
| Kitchen or bath refresh, same layout | Often yes if plumbing, gas or electric changes | Alteration agreement |
| Moving walls, new openings | Yes | Structural drawings, board |
| Combining apartments | Yes | Board, occupancy review |
| New or relocated bathroom | Yes | Plumbing stack capacity |
| Exterior work on landmark | Yes plus Landmarks | LPC permit |
| Basement finishing, cellar use | Yes | Egress, flood rules |
Our page Do I Need a Permit? gives plain-language examples if your scenario is not on this list.
3. Who Files and Who Is Responsible
In New York City, alterations are filed through DOB NOW: Build. The applicant of record has to be a New York State registered architect or a licensed professional engineer. That person prepares drawings, certifies compliance with the code and files the application. Plumbing, electrical and other trades require their own licensed professionals to file or perform specific scopes.
The application types
- New Building (NB): a new structure.
- Alteration-CO: work that changes use, egress or occupancy.
- Alteration (Alt): other alterations, such as many kitchen and bathroom jobs.
Some permit renewals and legacy filings remain in the older BIS and eFiling systems, and the DOB posts changes on its service updates page, which is worth checking if you have heard conflicting advice.
The contractor's role
New York City requires residential remodelers to hold a Home Improvement Contractor license from the Department of Consumer and Worker Protection. The license is separate from permits and applies to the person doing the work. Ask for the license number and verify it on the city's licensing resources before you sign a contract. For a checklist, see our guide to hiring a renovation contractor in NYC.
4. Landmarks, Historic Districts and Visible Changes
If your building is individually landmarked or sits in a historic district, the Landmarks Preservation Commission regulates the exterior. That covers facades, windows, stoops, rooftops visible from the street, doors and ironwork. LPC issues three types of permits: a Certificate of No Effect for work that does not change protected features, a Permit for Minor Work, and a Certificate of Appropriateness for more significant changes. You can see application details on the LPC applications page.
LPC permission does not replace a DOB permit, and a DOB permit does not replace LPC approval. They are separate reviews, and landmarked projects commonly add about 15 to 20 percent to time and budget in typical planning ranges. DUMBO, with its converted warehouse buildings and the DUMBO Historic District, is a good example of a neighborhood where windows and masonry changes can trigger LPC review while a loft's interior stays outside it.
5. Co-ops, Condos and Landlords
Whatever the city says, a co-op board or condo board has the power to control what goes on behind your door. Typical building requirements include:
- An alteration agreement signed before work starts.
- Proof of contractor insurance with the building named as additional insured.
- Drawings stamped by a registered design professional for anything involving walls, plumbing or electrical.
- Work hours, commonly weekdays only and often within a narrower window than the city Noise Code allows.
- Freight elevator reservations, floor protection and debris removal rules.
- Deposits and review fees.
Industry reports state that the Department of Buildings reinstated, effective January 26, 2026, a board attestation inside DOB NOW confirming that alterations in co-ops and condos are board-approved. This has been reported and should be confirmed with the DOB and your managing agent. The practical lesson is the same either way: line up your board approval before filing, because the two now travel together more than they used to. Our permit checklist page pairs well with this section.
6. A Realistic Permit Timeline
Timelines move with scope, completeness of drawings and the number of reviewers involved.
| Stage | What happens | Typical duration |
|---|---|---|
| Scope and budget | Define the job, get a written estimate | Days to weeks |
| Design and drawings | Architect or engineer prepares plans | Weeks |
| Board and landlord review | Alteration agreement, drawings reviewed | 2 to 8 weeks, varies widely |
| DOB filing and review | Application, plan review, objections | Weeks for simple, months for complex |
| LPC review (if applicable) | Staff or commission review | Weeks to months |
| Permit issuance and start | Notices, insurance, scheduling | Days to weeks |
| Construction | Varies by scope | Bath 3 to 6 weeks; kitchen 6 to 12 weeks |
| Sign-off | Inspections, close-out | Weeks |
For a full apartment gut, plan four to nine months including approvals. Many of these stages can overlap if drawings and board paperwork are prepared together, and a contractor who has done the sequence before can often compress the calendar without cutting corners.
7. New Rules Worth Knowing
Several changes are on the books. As of October 2026:
- Local Law 33 of 2026 enacts a new NYC Existing Building Code that replaces the 1968 code for alterations. The DOB says it takes effect July 17, 2027 and will govern all alteration applications. Until then, current rules apply.
- Local Law 47 of 2026 aligns the city energy code with the state code.
- Local Law 102 of 2025 requires residential gas detectors near gas-fed appliances beginning January 1, 2027.
- New sidewalk shed rules took effect August 13, 2026, which matters if your project includes facade work.
- The DOB began accepting cellar accessory dwelling unit applications for one- and two-family homes in April 2026.
You can read the underlying code and updates on the city's construction codes page. If you are planning a project that will straddle the 2027 effective date, ask your design professional which code the application will fall under.
8. Long Island and New Jersey: Different Doors, Same Logic
Outside the city, the structure is local. On Long Island, building permits are issued by the town, village or city building department, such as Hempstead, Oyster Bay or Garden City. Nassau and Suffolk counties require home improvement contractor licensing through county consumer affairs. Village permits can be stricter than the town around them. Our Nassau County permit guide and Suffolk County permit guide walk through the differences.
In New Jersey, permits come from the local municipal construction office under the Uniform Construction Code, and New Jersey requires home improvement contractors to register with the state Division of Consumer Affairs. Neighborhood-level rules vary, as do flood-zone requirements in places with a river or bay edge.
9. Why Let Your Contractor Coordinate Permits
An owner can learn the permit system. Most do not want to, and they are right: the cost of a missed step is high. Work done without a permit can lead to stop-work orders, fines, trouble at resale or refinancing, and orders to open finished walls for inspection. Insurers can also push back on claims tied to unpermitted work.
N.Y. Renovation Services handles that coordination as part of the job. Our in-house design-and-build team works with registered architects and engineers on drawings and filings, prepares the co-op and condo board package, schedules freight elevators and inspections, and sequences trades so that plumbing, electrical, tile, flooring and painting happen in the right order. For landmarked buildings, we prepare the Landmarks submission along with the DOB filing so the two do not conflict.
Send the address and a rough scope through our free estimate form and we will map the likely approvals before you pay for drawings. That early read is often where owners save the most, because it shows whether the job is a filing, a board matter or neither.
You get a written, itemized contract that shows design and filing costs separately from construction, so you can see where the typical 15 to 25 percent soft-cost allowance goes. We also pledge 5 percent of total project cost to a nonprofit of your choosing. To compare costs, look at our renovation cost guide for 2026, and use the ROI calculator to see how an approved, permitted renovation affects value.
10. Neighborhoods and ZIP Codes We Serve
Permit paths look different depending on where the project sits.
- Murray Hill (Manhattan), ZIP 10016: Mid-rise co-ops and condos, brownstones and walk-ups. Board alteration agreements and freight elevator booking are the first hurdle, and brownstones need DOB filings handled by a registered professional.
- DUMBO (Brooklyn), ZIP 11201: Converted warehouse lofts with exposed brick inside the DUMBO Historic District. Interior changes may need only DOB and condo approvals, while windows and facades add LPC review.
- Queens Village (Queens), ZIPs 11428, 11429: Detached homes with basements. Finishing a basement or adding a bath usually triggers a DOB filing, and egress and flood considerations matter.
- St. George (Staten Island), ZIP 10301: Ferry-adjacent apartments and Victorian houses, with a Landmarks district nearby. Exterior changes should be checked with the LPC.
- Hempstead (Nassau County, Long Island), ZIP 11550: The Town and Village of Hempstead have separate building departments, and capes, colonials and multifamily homes mean filings vary by address.
- East Orange (Essex County, NJ), ZIPs 07017, 07018: Older multifamily buildings and Victorians. Permits come from the local construction office, and older buildings often require lead and asbestos checks before demolition.
We also serve other parts of the city, Long Island and New Jersey; see our DUMBO luxury apartment renovation page for how we handle loft projects, or read how to navigate NYC renovation codes in the outer boroughs.
11. Next Steps: Get Your Free Estimate
Start with scope. Decide what you want to change, whether walls, plumbing or electrical move and whether the work touches an exterior or a shared element. Then ask your building for its alteration rules and, if you are in a historic district, check the LPC's map before you spend on design.
When you are ready, request a quote. Tell us the address, the building type and the rooms involved. We will schedule a site visit, outline the permits and approvals your project needs, and send a written, itemized estimate. If the scope turns out to be cosmetic, we say so, and you avoid paying for filings you do not need. If it needs a registered architect or engineer, we bring one in and show their fee as its own line, so the soft costs are never buried in a lump sum. After approval, one project manager keeps the schedule, deliveries and building inspections moving, which matters in buildings where elevator time and work hours are tightly controlled. If the project is a kitchen, our kitchen remodeling page shows what a full scope looks like, from design to final paint. For gut renovations, tile, flooring and interior and exterior painting, the approach is the same: plan the approvals first, then build.
Safety Note: All work follows OSHA 30 safety and EPA Lead-Safe practices for pre-1978 homes. Check local permit requirements before starting.
James - Lead Renovation Editor. With over 20 years in renovation and construction, James writes and edits our guides. More about James