Table of Contents
- Most NYC construction work needs a Department of Buildings permit, while cosmetic work such as painting generally does not, though building rules still apply.
- Alterations are usually filed in DOB NOW: Build by a New York State-registered architect or professional engineer acting as applicant of record.
- Co-op and condo projects need board approval, and landmarked buildings need Landmarks Preservation Commission permits for covered work.
- Simple filings can take weeks and complex ones months; design and permit fees often add roughly 15 to 25 percent to construction costs.
- A new Existing Building Code, Local Law 33 of 2026, is expected to take effect July 17, 2027, so confirm which rules apply to your filing date.
New Yorkers have a complicated relationship with building permits. Some think of them as paperwork that slows down a good project. Others discover too late that a permit was needed, usually when a buyer's attorney asks for sign-offs. The truth is simpler. A permit is the city's way of confirming that someone qualified has reviewed your plans, and that the work will be inspected. It protects your safety, your insurance and your resale.
This guide explains how permitting works in New York City as of October 2026: when you need one, what the process looks like in DOB NOW, who does what, and how long it takes. It also covers the layers that surround the permit, such as co-op boards, Landmarks and licensed contractors. For quick first answers, see Do I Need a Permit?, and for deeper dives, our articles on when you need a building permit in New York and how long a building permit takes in NYC.
1. What a Building Permit Is and Why It Matters
A building permit is the Department of Buildings (DOB) authorization to perform construction work that has been reviewed against the city's codes. It covers structural integrity, fire safety, egress, plumbing, gas, electrical, energy and zoning. After the permit, the work is inspected, and a sign-off closes the file.
Why it matters:
- Safety: reviewers check that walls, exits, gas lines and electrical work meet code.
- Insurance: unpermitted work can complicate claims.
- Resale: buyers, lenders and attorneys often ask for permit history and sign-offs.
- Neighbors: permits protect adjoining units from unsafe shared systems.
The DOB publishes the basics on its page about obtaining a permit, and its codes page links to the construction codes.
2. Which Projects Need a Permit and Which Do Not
In New York City, most construction work needs a DOB permit. The following table shows common patterns. It is a guide, not legal advice, and a licensed professional should confirm yours.
| Project | Permit typically needed? | Notes |
|---|---|---|
| Moving or removing walls | Yes | Structural review may be required |
| Moving plumbing, gas or electrical lines | Yes | Licensed trades and filings |
| Kitchen or bathroom remodel with layout change | Yes | Co-op or condo approval too |
| Combining apartments | Yes | Alteration filing and board approval |
| New windows in an existing opening, same size | Often simpler or no filing | Landmark and building rules apply |
| Painting, wallpaper, minor patching | Generally no | Building rules still apply |
| Replacing flooring only | Generally no DOB permit | Co-op sound rules apply |
| Cabinet swaps without moving utilities | Often no | Confirm with a pro |
| Roof, facade or structural repairs | Yes | Often tied to inspection rules |
| Basement or cellar conversion | Yes | Habitability and egress issues |
Cosmetic work does not need a DOB permit, but a co-op, condo or landlord may still require approval, insurance certificates and an alteration agreement.
3. The Filing Types: NB, Alt-CO and Alt
DOB categorizes filings by what the project does to the building.
- New Building (NB): constructing a new building.
- Alteration-CO (Alt-CO): work that changes use, egress or occupancy, and so requires a new or amended certificate of occupancy.
- Alteration (Alt): other alterations, from interior renovations to some structural work.
Most apartment renovations are Alt filings. Certain permit renewals and some filings remain in legacy systems, such as BIS and eFiling, while many filings move through DOB NOW. Because system details change, check the DOB's service updates page for the current state.
4. The Process, Step by Step
Step 1: Define the scope
Decide what you want to change. A clear scope, even a rough one, lets a design professional tell you what will be filed.
Step 2: Check your building's rules
For co-ops and condos, request the alteration agreement and house rules. They define board submission requirements, insurance, work hours, deposits, approved contractors and acoustic requirements.
Step 3: Hire a design professional
Alterations are filed by a New York State-registered architect or licensed professional engineer who acts as the applicant of record. They prepare drawings, calculations and the application.
Step 4: Prepare drawings and board package
The drawings show existing and proposed conditions. Boards typically want drawings, a scope letter, contractor information and insurance certificates before they approve.
Step 5: File in DOB NOW: Build
The applicant submits the application and fees. Industry reports state that DOB reinstated, effective January 26, 2026, a board attestation inside DOB NOW: Build confirming that alterations are board-approved. Confirm the current requirement with DOB and your managing agent.
Step 6: Plan review and objections
DOB reviewers examine the filing and may issue objections. The professional responds with revised drawings or explanations. This back-and-forth is the main source of timeline variation.
Step 7: Approval, fees and permit issuance
After approval, remaining fees are paid, contractor and insurance information is entered, and the permit is issued. Work cannot begin before this.
Step 8: Construction and inspections
Licensed trades perform plumbing, gas and electrical work. Required inspections occur at set stages, and the professional submits sign-offs.
Step 9: Sign-off and closeout
When work is complete and inspected, the professional closes the filing. Keep the paperwork for resale.
5. Beyond the DOB: Boards, Landmarks and Contractor Licensing
Co-op and condo approval
Boards review plans against building rules and often require their own engineer or architect review. Allow time, since boards meet on schedules. Our guides on navigating the process for obtaining building plans and work permits and how to get a building permit for your NYC renovation add detail.
Landmarks
If the property is a landmark or in a historic district, the Landmarks Preservation Commission (LPC) must approve covered work. Permit types include a Certificate of No Effect, a Permit for Minor Work and a Certificate of Appropriateness. See the LPC permit applications page. Landmarked buildings often add about 15 to 20 percent to time and budget.
Contractor licensing
Residential remodeling in New York City requires a Home Improvement Contractor license from the Department of Consumer and Worker Protection. Plumbing and electrical work must be done by appropriately licensed trades.
Environmental rules
Older buildings may require an asbestos survey before disturbance, and the EPA's lead rule applies to paid work that disturbs paint in pre-1978 homes. Silica dust control applies to cutting and demolition. These are line items to plan for, not afterthoughts.
6. Timelines and Costs
Timelines vary widely. Simple filings can take weeks, while complex ones can take months. The largest variables are how complete the drawings are, how quickly objections are answered, and how fast the board approves.
| Phase | Typical range |
|---|---|
| Design and drawings | 2 to 6 weeks |
| Board review | Weeks, depending on meeting schedule |
| DOB plan review | Weeks to months |
| Construction | Depends on project; a kitchen is about 6 to 12 weeks, a bathroom 3 to 6 weeks |
As typical 2026 planning ranges, design, engineering, expediting and permit fees often add roughly 15 to 25 percent to construction costs. A written, itemized quote governs. For a deeper fee breakdown, read our NYC renovation cost guide.
Common permit mistakes that cost time
- Hiring the contractor before the building's rules are read, then discovering the board requires a different insurance certificate or an approved vendor list.
- Starting demolition while the board or DOB review is still open, because the schedule felt tight.
- Filing drawings that do not match what is actually planned, such as a relocated sink that appears nowhere on the plans.
- Forgetting that lead, asbestos and silica rules apply to demolition, even in a small project.
- Leaving sign-offs open, which can surface years later during a sale or refinance.
- Assuming that a lower price from a contractor who says no permit is needed is a bargain; ask for a free written estimate and compare the scope line by line.
A realistic plan also builds in time for objections. Reviewers often ask for clarifications on egress, fire separation, ventilation or structural support, and the professional answers with revised sheets. That is normal, not a sign the project is in trouble.
7. Rule Changes to Watch
- A new Existing Building Code, enacted as Local Law 33 of 2026, replaces the 1968 code for alterations. 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's energy code with the state code.
- Local Law 102 of 2025 requires residential gas detectors near gas-fed appliances from January 1, 2027.
- New sidewalk shed rules took effect August 13, 2026.
- DOB began accepting cellar accessory dwelling unit applications for one- and two-family homes in April 2026.
Rules change often, so confirm with the DOB before you rely on any summary, including this one.
8. Neighborhoods and ZIP Codes We Serve
Permitting looks different across the region. On the Upper West Side (ZIPs 10023, 10024 and 10025), pre-war co-ops, brownstones and plaster walls come with historic districts and thorough boards, so board packages are often the longest step. DUMBO (ZIP 11201) has converted warehouse lofts in the LPC DUMBO Historic District, where exposed brick and exterior work trigger Landmarks review.
Whitestone (ZIP 11357) has detached and semi-detached homes on large lots, where additions and exterior work are the common filings. Dongan Hills (ZIPs 10304 and 10305) in Staten Island has detached homes and basements, where cellar conversions and egress are common questions. Woodmere (ZIP 11598) in Nassau County's Five Towns has large colonials, and permits come from the town or village building department, so check with your municipality. Millburn (ZIP 07041) in Essex County, New Jersey has large colonials and downtown condos, where permits come from the municipal construction office under the Uniform Construction Code, administered by the state's Division of Codes and Standards. See our pages for the Upper West Side and DUMBO.
9. Why Work With a Licensed Design-Build Team on Permits
The permit itself is a form. The hard part is everything around it: the right drawings, the board's checklist, the contractor's insurance certificates, the sequence of inspections and the discipline to wait until the permit is issued before demolition begins.
N.Y. Renovation Services is a licensed and insured design-build contractor serving the five boroughs, Long Island and nearby New Jersey. Alteration filings are made by a New York State-registered design professional, and we coordinate the process around them. That coordination is where projects usually go wrong.
What our in-house team handles:
- Scope and sequencing: we align the scope with what will be filed, so drawings match what is built.
- Board paperwork: we assemble contractor information, insurance certificates and alteration agreement requirements for your managing agent.
- Licensed trades: plumbing, gas and electrical work is performed by properly licensed trades, scheduled around inspections.
- Hazmat steps: asbestos surveys, lead-safe practices and silica controls are built into the plan.
- Itemized pricing: design, filing, permit and construction costs appear as separate lines in a written contract with no hidden fees.
- Closeout: we keep documentation organized so sign-offs are straightforward.
Skipping the process, or hiring someone who says you do not need a permit when you do, is one of the most expensive mistakes in a renovation. The saving is rarely more than a few weeks, while the cost can include stop-work orders, fines, insurance disputes and a renovation that has to be opened up for inspection. Residential remodeling in New York City also requires a Home Improvement Contractor license from the Department of Consumer and Worker Protection, and our contractor hiring checklist shows what else to verify. We also donate 5 percent of total project cost to a nonprofit of the client's choice.
New Jersey and Long Island projects add their own twist. NJ permits come from the local construction office under the UCC, and contractors must be registered with the state, while Long Island permits come from the town, village or city building department, and county licensing may apply. We help you identify the right office and what it will want to see.
10. Next Steps: Get Your Free Estimate
If you are planning a renovation, start with the scope and your building's rules, and we will tell you what a realistic path looks like.
- Describe what you want to change, and gather photos and your building's alteration agreement.
- Note any deadlines such as a move-in date, a sale or a lease start.
- Request a free estimate on our quote page or call (347) 455-1741, Monday through Saturday, 8 AM to 5 PM.
- Review a written, itemized proposal with approvals, construction and finishes separated.
Our Kitchen Remodeling NYC page shows a common project that often needs filings, and the Renovation ROI Calculator helps you weigh scope against return before you invest in drawings.
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