Do You Need a Permit? NYC Guide for Every Project Type

New York City has some of the strictest building codes in the country. The Department of Buildings (DOB) regulates nearly every type of construction, and the penalties for unpermitted work are steep. Fines, stop work orders, and forced removal of completed work are all on the table.

This guide covers the ten most common "do I need a permit" questions for NYC homeowners and property owners. For each project type, you'll get a clear yes or no answer, the specific permit type required, and the details that determine which side of the line your project falls on.

Quick Reference: NYC Permit Requirements by Project Type

Project Type	Permit Needed?	Permit Type	Notes
Bathroom remodel	Only if plumbing/electrical moves	Alt-2 or Alt-3	Cosmetic updates are permit-free
Kitchen remodel	Only if gas/plumbing/electrical moves	Alt-2 or Alt-3	Gas work always requires a permit
Roof replacement	Yes	Alt-2 or Alt-3	All roof work requires filing
Basement finishing	Yes	Alt-1	Change of use triggers major filing
Shed	Over 120 sqft or 10ft tall	Alt-2 or Alt-3	Under 120 sqft and under 10ft = no permit
Window replacement	Only if size/location changes	Alt-2 or Alt-3	Same-size, same-location = no permit
Fence	Over 6ft tall	Alt-3	Under 6ft = no permit
Deck	Yes	Alt-2 or Alt-3	All decks require structural plans
Flooring replacement	Generally no	N/A	Only if subfloor or fire-rating affected
Wall removal	Yes (most cases)	Alt-2 or Alt-3	Load-bearing walls always need a permit

For the official DOB resource, see NYC DOB: Do I Need a Permit?

NYC DOB Permit Types: A Quick Overview

Before diving into each project type, it helps to understand the five main DOB permit categories. The type you need depends on your project's scope.

• NB (New Building). For entirely new construction from the ground up.
• Alt-1 (Alteration Type 1). Major alterations that change the building's use, egress, or occupancy. Basement conversions typically fall here.
• Alt-2 (Alteration Type 2). Alterations involving multiple work types (plumbing, electrical, and construction) but no change of use or egress.
• Alt-3 (Alteration Type 3). Minor alterations involving one work type. A straightforward plumbing reroute or single-trade job usually qualifies.
• DM (Demolition). Full or partial demolition of a structure. Requires ACP-5 asbestos certification and utility disconnects before filing.

NYC also introduced the new Existing Building Code (EBC) in 2026, which updates requirements for alterations to existing buildings. Your architect or permit expediter should be filing under the current code provisions.

Do You Need a Permit to Remodel a Bathroom in NYC?

It depends on the scope. If you're moving plumbing lines, adding new fixtures (like a second sink or a new shower where there wasn't one), or adding electrical circuits, you need a DOB permit. The filing is typically an Alt-2 or Alt-3 depending on how many trades are involved.

Cosmetic bathroom work doesn't require a permit. That includes replacing tile, installing a new vanity in the same location, swapping fixtures without moving supply or drain lines, and repainting. If the pipes stay where they are and no new electrical is added, you're in the clear.

The gray area comes with things like moving a toilet or adding a heated floor (which requires new electrical). When in doubt, check with a licensed plumber or permit expediter before starting work. Unpermitted plumbing work can cause problems when you sell, especially in co-ops where board approval requires DOB sign-offs.

For a full cost breakdown, see our bathroom renovation cost guide.

Do You Need a Permit for a Kitchen Remodel in NYC?

Only if you're moving gas, plumbing, or electrical. Replacing cabinets, installing new countertops, adding a backsplash, or painting are all cosmetic changes that don't require a DOB permit.

But the moment you relocate the sink (moving drain and supply lines), add or move a gas line for a range or cooktop, or run new electrical circuits for additional outlets or appliances, you need to file. Gas work in NYC always requires a licensed master plumber and a DOB permit. There are no exceptions.

Many kitchen renovations end up needing permits because homeowners decide to reconfigure the layout. Moving the sink from one wall to another or adding a kitchen island with a gas cooktop are common triggers. If your kitchen remodel involves any layout changes beyond surface finishes, assume you'll need a permit.

Our kitchen renovation cost guide covers what to budget for permitted vs. cosmetic kitchen projects.

Do You Need a Permit to Replace a Roof in NYC?

Yes. Roof replacement in NYC requires a DOB permit. This applies to all building types, from single-family homes to commercial properties. The filing is usually an Alt-2 or Alt-3 depending on the scope of work.

A registered architect or professional engineer (PE) must be the applicant of record. Your roofing contractor handles the installation, but the permit application needs a design professional's stamp. The application goes through DOB NOW Build, and you'll need to include details about roofing materials, drainage, and structural adequacy.

Roof repairs (patching a leak, replacing a few damaged shingles) are generally considered maintenance and don't require a permit. But a full tear-off and replacement does. If you're adding rooftop equipment like HVAC units or solar panels, those require separate permits as well.

Do You Need a Permit to Finish a Basement in NYC?

Yes, and it's one of the most complex permit types. Converting an unfinished basement into livable space is considered a change of use by DOB. This triggers an Alt-1 filing, which is the most involved alteration permit category.

Alt-1 applications go through full DOB plan review (not professional certification), and the requirements are extensive. Your plans need to address minimum ceiling height (typically 7 feet for habitable space), emergency egress (windows or doors to the outside), waterproofing, flood zone compliance, and electrical and plumbing work.

If your property is in a FEMA flood zone, the requirements get even stricter. Basements in flood zones may not qualify for conversion to living space at all, or may require expensive flood-proofing measures.

The consequences of finishing a basement without a permit are severe. DOB can issue a vacate order, forcing occupants out until the space is brought into compliance or restored to its original condition. This isn't a theoretical risk. NYC has been actively enforcing basement safety rules, particularly after flooding events.

A permit expediter can help navigate the Alt-1 process, which typically takes 3 to 6 months for approval depending on DOB's review backlog.

Do You Need a Permit for a Shed in NYC?

It depends on the size. Sheds under 120 square feet in floor area and under 10 feet tall are generally exempt from DOB permits. Anything larger than those thresholds requires a permit filing.

Even if your shed is small enough to skip the DOB permit, you still need to follow zoning rules. That means checking setback requirements (how far the shed must be from property lines), lot coverage limits, and whether your zoning district allows accessory structures at all. In some residential zones, lot coverage is already maxed out, and adding a shed would violate zoning.

If your property is in a landmark or historic district, even a small shed may need approval from the Landmarks Preservation Commission (LPC) before you can build it. LPC reviews the design, materials, and visibility from the street.

Pre-fabricated sheds from big box stores still need to meet these rules. "It came from Home Depot" is not a permit exemption.

Do You Need a Permit to Replace Windows in NYC?

Same size, same location: no permit. Different size or location: yes. This is one of the cleaner rules in NYC building code. If you're doing a like-for-like window replacement where the new window fits the existing opening without any structural modification, no DOB permit is needed.

If you want to enlarge a window, add a new window where there wasn't one, or change the shape of an opening, that's altering the building envelope and requires a permit. The structural framing around the opening needs engineering, and the plans go through DOB review.

In landmark and historic districts, even like-for-like window replacements may require LPC approval. The commission reviews window materials, profiles, and configurations to ensure they match the building's historic character. This applies to both individual landmarks and buildings within historic districts.

Co-op and condo buildings typically have their own window replacement policies on top of DOB requirements. Many require specific window brands, colors, or configurations to maintain a uniform building appearance. Check your building's alteration agreement before ordering windows.

Do You Need a Permit for a Fence in NYC?

Under 6 feet: no permit. Over 6 feet: yes. Fences under 6 feet tall are exempt from DOB permit requirements in New York City. If your fence exceeds 6 feet, you'll need to file for a permit.

Regardless of height, all fences must comply with zoning regulations. Corner lots have visibility triangle requirements that restrict fence height near intersections. Front yard fences have different height limits than side or rear yard fences in many zoning districts. And in some residential zones, certain fence materials (like chain link with barbed wire) are prohibited.

Landmark districts add another layer. Even a code-compliant fence under 6 feet may need LPC review if it's visible from a public street and your property is in a designated historic district.

Shared property line fences are a common source of neighbor disputes in NYC. Before building, confirm the exact property line with a survey. Building on your neighbor's property, even by a few inches, creates legal and practical problems that a permit won't solve.

Do You Need a Permit for a Deck in NYC?

Yes. All decks require a DOB permit in NYC. Decks are considered structures, and they need to meet structural, zoning, and egress requirements. There's no size exemption for decks like there is for sheds.

You'll need a registered architect or PE to prepare structural plans showing the deck can support the required loads. The filing is typically an Alt-2 or Alt-3 through DOB NOW Build. Plans must address foundations, structural connections to the existing building (if attached), railing height and spacing, and compliance with lot coverage and setback rules.

Rear yard decks are the most common type in NYC's residential neighborhoods, particularly in Brooklyn and Queens. These need to comply with rear yard setback requirements, which vary by zoning district. A deck that extends too far into the required rear yard can trigger a zoning variance, which means going before the Board of Standards and Appeals (BSA). That's a months-long process you want to avoid.

Rooftop decks have additional requirements including structural load analysis of the existing roof, guardrail specifications, and fire access compliance. If you're in a co-op or condo, the board must approve rooftop deck plans before you file with DOB.

Do You Need a Permit to Replace Flooring in NYC?

Generally, no. Standard flooring replacement is considered cosmetic work. Swapping carpet for hardwood, installing new tile, or laying laminate flooring doesn't require a DOB permit. This is true for both houses and apartments.

There are exceptions. If your flooring project involves structural subfloor work (replacing damaged joists, sistering beams), you're doing structural work that requires a permit. Similarly, if you're changing floor levels in a way that creates a step or affects door clearances, that may trigger a filing.

In multi-family buildings and co-ops, there's a practical concern beyond DOB: noise. Many co-op and condo buildings require 80% carpet coverage or specific STC (Sound Transmission Class) ratings for hard flooring. Your building's alteration agreement may require board approval and a flooring plan even though DOB doesn't require a permit. Violating your building's carpet rule can result in fines from the board and complaints from downstairs neighbors.

If you're removing flooring to expose a concrete slab in a multi-story building, check whether the existing flooring was part of the fire-rated floor assembly. Removing it could compromise the fire rating between floors, which is a code issue that does require DOB involvement.

Do You Need a Permit to Remove a Wall in NYC?

Yes, in most cases. Removing a load-bearing wall always requires a DOB permit and structural engineering plans. A licensed PE or RA must design the replacement structural support (typically a steel beam and columns) and stamp the plans for DOB submission.

Non-load-bearing walls are less straightforward than you might think. Even if a wall isn't structural, it may serve as a fire separation between units, a fire-rated corridor wall, or a demising wall that defines the legal apartment layout. Removing any of these requires a permit and potentially an amendment to the certificate of occupancy.

In co-ops and condos, wall removal almost always requires board approval through an alteration agreement, plus a review by the building's architect. The board wants to ensure the work doesn't affect the building's structure, fire safety, or other units. This is in addition to any DOB requirements.

The safest approach: have a licensed engineer or architect assess the wall before you touch it. They can determine if it's load-bearing, fire-rated, or otherwise regulated. If you remove a load-bearing wall without a permit and proper engineering, you risk a partial structural collapse. That's not just a fine. It's a safety emergency.

For projects involving wall removal as part of a larger renovation, see our gut renovation cost guide.

What Happens If You Skip the Permit?

Working without required permits in NYC carries real consequences. Here's what you're risking:

• Stop work orders. DOB can issue a stop work order if an inspector discovers unpermitted work. All construction stops until the violation is resolved. Fines start at $2,500 and can go up to $25,000. Our stop work order guide covers the full process.
• ECB violations and fines. The Environmental Control Board (ECB) handles DOB violation hearings. Fines for working without a permit range from $800 to $25,000 depending on the violation class. See our ECB violation guide for details.
• Forced removal of completed work. DOB can require you to remove finished work and restore the space to its original condition at your expense. This is common with unpermitted basement conversions and illegal room additions.
• Problems selling your property. Open violations show up on title searches. Most buyers and their attorneys will require violations to be cleared before closing. Unpermitted work can kill a sale or significantly reduce your price. Our violation removal service helps clear these issues.
• Insurance complications. If unpermitted work causes damage (a fire, water damage, structural failure), your insurance company may deny the claim. They have a legitimate argument that the work wasn't done to code.

The cost of getting a permit is almost always less than the cost of dealing with the consequences of not getting one. A typical Alt-3 permit costs a few hundred dollars in DOB filing fees plus expediting fees. An ECB violation for working without a permit can cost thousands.

How to File for a Permit in NYC

If your project does need a permit, here's the basic process:

1. Hire a registered architect or PE. Nearly all DOB permit applications require a licensed design professional as the applicant of record. They'll prepare the plans and specifications.
2. File through DOB NOW Build. Your architect or permit expediter submits the application through NYC DOB's online portal. The application includes plans, scope of work, and required documentation.
3. DOB review or professional certification. The application either goes through DOB plan review (2 to 12 weeks depending on complexity and type) or is professionally certified by the architect (faster, but subject to DOB audit).
4. Permit issuance. Once approved, DOB issues the work permit. Post the permit at the job site before starting work.
5. Inspections and sign-off. DOB inspects the work at various stages. After final inspection, you receive a letter of completion or updated certificate of occupancy.

Permitted work in NYC can only happen during approved hours: 7am to 6pm on weekdays, with limited weekend work allowed. If your project needs to run outside those hours, you'll need an After-Hours Variance (AHV) permit, which costs $0 to $420 depending on the type.

For a complete walkthrough of the permit process, see our NYC renovation permits guide.

NYC-Specific Rules That Catch People Off Guard

A few things that are unique to New York City and trip up even experienced property owners:

• Co-ops and condos have their own rules. DOB permits are just one layer. Co-op and condo boards require alteration agreements, board approval, insurance certificates, and sometimes a building architect review. These requirements exist on top of DOB, not instead of DOB.
• Landmark districts need LPC approval first. If your property is in a designated historic district or is an individual landmark, you must get Landmarks Preservation Commission approval before filing with DOB. LPC reviews exterior changes (and sometimes interior changes for individual landmarks). Filing with DOB before getting LPC sign-off is a common mistake that adds months to your timeline.
• Open violations can block new permits. If your property has unresolved DOB or ECB violations, DOB may refuse to issue new permits until those violations are cleared. Always check your property's violation history on BIS before starting a new project.
• The 2026 Existing Building Code (EBC). NYC updated its building code provisions for alterations to existing buildings in 2026. If you're researching permit requirements, make sure you're looking at current code, not outdated information. Your architect or expediter should be filing under the latest provisions.

Get Help With Your NYC Permit

Figuring out whether you need a permit is step one. Actually getting it filed, approved, and inspected is where most of the time and frustration lives. That's what we do.

At Permit Experts NYC, we handle the full permit process: DOB filings, plan review coordination, violation resolution, and multi-agency coordination. Whether you're doing a bathroom remodel that needs plumbing permits or a full basement conversion requiring Alt-1 approval, we'll manage the filing from start to finish.

Check our pricing page for transparent rates by permit type, or reach out for a free project assessment.