NYC Permits and Building Code for Water-Damage Repair and Reconstruction

Do you need a NYC permit for water-damage repairs?

The starting point in the New York City Administrative Code is broad. Section 28-105.1 makes it unlawful to construct, alter, repair, move, demolish, or change the use of a building, or to alter its plumbing, mechanical, or fire-protection systems, until a written permit has been issued. The permit is the rule; the exemptions are the exception. That framing matters, because the honest answer to "do I need a permit" is almost never a flat yes or no. It is "it depends on what you are touching."

For water damage, the work usually splits into two phases. The first phase is stabilization and removal: extracting standing water, drying the structure, and pulling out saturated, non-structural finishes like wet carpet, soaked baseboard, or ruined drywall. Much of that falls under the ordinary-repair exemption and proceeds without a DOB permit. The second phase is reconstruction: putting the home back. That is where the answer can flip, because the moment the work touches structure, fire-rated assemblies, plumbing beyond a simple fixture swap, electrical circuits, or a flood zone, a permit and a licensed filing generally come into play.

The exemption that covers most first-phase work is section 28-105.4.2, ordinary repairs. The next section breaks down where that exemption ends, because the boundary is narrower than most homeowners assume.

What repair work is exempt from a NYC permit, and what never is

The Administrative Code lists the categories of work that do not require a permit in section 28-105.4: emergency work, minor alterations and ordinary repairs, certain public-utility work, ordinary plumbing work, and certain signs. Two carry the most weight after a water loss: ordinary repairs and emergency work. An exemption never authorizes work that violates the code, and it never relieves the owner of obligations to other agencies, so an exempt job can still carry, for example, an asbestos survey duty.

Ordinary repairs, defined in section 28-105.4.2, are like-for-like replacements with the same or equivalent materials, done in the ordinary course of maintenance, that do not affect health, fire safety, or structural safety. Swapping a damaged plumbing fixture, a length of piping, or a faucet from an exposed stop valve to the inlet side of a trap sits inside this exemption. So does replacing ruined drywall on a non-load-bearing, non-fire-rated wall with equivalent material.

The companion list, section 28-105.4.2.1, spells out what is not ordinary, and this is the part that catches people. It is not ordinary to cut away any load-bearing wall, floor, or roof, or any required fire-rated assembly. It is not ordinary to remove, cut, or modify a beam or structural support. And most plumbing beyond that exposed-valve-to-trap window is excluded. In plain terms: if the wet wall you want to open is holding the house up, or is the rated separation to a garage, or hides plumbing that runs deeper than a fixture connection, the job has likely left the exemption and needs a permit.

This is also where a flood zone overrides everything, which the flood-zone section below covers in full. Inside a mapped flood hazard area, the ordinary-repair exemption does not save you the way it does on higher ground.

Emergency work after a water loss: the two-business-day rule

There is a specific provision for work that cannot wait for a permit. Section 28-105.4.1 allows work that would otherwise require a permit to be performed, to the extent necessary, to relieve an emergency condition. The catch is documentation and timing: a permit application must be filed within two business days of starting the work, with a written description of the emergency condition and the measures taken to address it. The code gives examples such as stabilizing an unsafe structural condition or repairing a gas leak.

It is worth being precise about how narrow this is, because the phrase "emergency work" gets stretched in marketing. Most water mitigation, the extraction, the drying, the removal of wet non-structural finishes, is exempt ordinary work that never required a permit in the first place, so the two-business-day clock does not even start for it. The emergency provision is the bridge for the smaller subset of work that would have needed a permit but cannot wait, such as shoring a structural element that has become unsafe from saturation. The permanent reconstruction that follows takes its own permit on its own timeline. A contractor who tells you every flooded basement triggers a two-day DOB filing is overstating it; one who treats a sagging, water-compromised structural member as something to document and file on is reading the code correctly.

What triggers an ACP-5 asbestos check before demolition

Building age changes the sequence. Under section 28-106.1, the Department of Buildings will not issue a demolition or alteration permit for a building whose plans were submitted for approval on or before April 1, 1987, unless the applicant provides the asbestos certification required by the Department of Environmental Protection, or DEP has granted a variance. In practice that certification is an ACP-5, filed by a DEP-certified asbestos investigator, stating the work is not an asbestos project, or an ACP-7 where it is. Buildings filed after that 1987 date can typically demonstrate an exemption instead.

Staten Island has a meaningful share of older housing, so this is not a rare edge case here. According to NYC Planning data drawn from the American Community Survey, the borough has roughly 181,000 housing units, with a large portion built before 1980, which is the era this rule is aimed at. On a pre-1987 home, the asbestos survey is a gate that sits in front of demolition, before any wall comes down.

One nuance that protects homeowners from a nasty surprise: the DEP asbestos thresholds operate independently of whether DOB requires a building permit. An asbestos project is defined by the amount of asbestos-containing material disturbed, more than 25 linear feet or more than 10 square feet, and that survey-and-abatement obligation can attach even to work that is otherwise permit-exempt. So a job can be an ordinary repair for DOB purposes and still carry an asbestos duty on an older building. The survey is the trigger, not the permit.

Lead is the parallel issue on pre-1978 homes. The federal Renovation, Repair and Painting rule applies to compensated renovation in pre-1978 housing that disturbs more than six square feet of interior painted surface in a room, and it requires lead-safe work practices and a certified firm. It is a federal requirement that applies in New York City; homeowners doing their own work are exempt. Treat it as part of the same age-driven sequence: on an older Staten Island home, the contractor you hire for any cutting or demolition should be operating under the appropriate asbestos and lead protocols.

Rebuilding in a Staten Island flood zone: the dual-map reality

For a large stretch of Staten Island, the South Shore and the East Shore especially, the flood maps change the whole calculation, and they do it in a way that surprises people who only think about flood insurance. Two things are essential here.

First, the flood zone overrides the ordinary-repair exemption. Under 2022 NYC Building Code Appendix G, section G104.1, anyone intending to conduct development within a flood hazard area must apply for and obtain a permit under section 28-105.1, notwithstanding any exemption in section 28-105.4. Development is defined broadly: essentially any man-made change to real estate, including building, filling, grading, paving, and excavation. So the like-for-like drywall swap that would be exempt on higher ground does not get the same free pass inside a mapped flood zone.

Second, there is the 50 percent rule. Appendix G defines substantial damage as damage where restoring the structure would cost 50 percent or more of its pre-damage market value, and substantial improvement as work whose cost reaches 50 percent or more of the structure's market value. Costs are tracked cumulatively, not job by job. When the Department of Buildings determines a structure is substantially damaged, the repair is treated as a substantial improvement, which forces full Appendix G compliance, including elevation requirements, even if the owner never intended to raise the house. For a waterfront-perimeter or low-lying Staten Island home that took serious water, that determination is the difference between patching and a code-driven rebuild.

The map situation itself is genuinely confusing, and it is worth stating clearly because a lot of bad advice flows from collapsing it. Following the City's successful appeal in 2016, two different flood maps are in use at once. Flood insurance rates are still based on the 2007 maps, while the 2015 preliminary maps are used for building code, zoning, and planning, with the more restrictive of the two governing on the code side. They are not the same map and they do not serve the same purpose. New York City's FEMA community number is 360497. Do not assume your insurance map and your building-code map agree.

Because these designations turn on your exact address, the responsible move is to verify the specific property rather than rely on a neighborhood rule of thumb. The NYC Flood Hazard Mapper from City Planning and the FEMA Map Service Center are the authoritative lookups, and a determination from the Department of Buildings is what actually governs a substantially damaged structure.

Who pulls the permit, the homeowner or the contractor?

This is the question with the most misinformation around it, and getting it right protects you from hiring the wrong party. The short version: legal responsibility and filing authority are two different things.

The property owner is ultimately responsible for making sure required permits are obtained, and the owner attests electronically in DOB NOW. But the owner is generally not the one who pulls a general-construction work permit. For a one- to two-family alteration, plans are filed by a licensed Professional Engineer or Registered Architect as the applicant of record, and the construction work permit issues to a Department of Buildings registered General Contractor. Since November 2008, it has been unlawful to conduct business as a general contractor in New York City without a DOB general-contractor registration, and registered general contractors carry their own insurance, including a general liability policy that DOB requires at a minimum of one million dollars.

Plumbing and electrical sit under their own licensed filers, with no homeowner workaround. Plumbing work beyond the ordinary-repair window must be performed under a Licensed Master Plumber, who files the plumbing application under his own seal. Electrical work requires a New York City licensed electrical contractor, who files a separate electrical permit. These are not roles a general contractor or a homeowner can self-perform or self-sign.

Here is how that maps onto a Staten Island water-damage rebuild, and where Anajur fits honestly. Anajur Construction Corp. holds a New York City DCWP Home Improvement Contractor license, number 1220350-DCA, which is the consumer-protection license that governs residential home-improvement work and is required in addition to the trade and registration roles above. On a job that needs filed permits, the work is coordinated the way the code contemplates: the registered general contractor of record pulls the building permit, the Licensed Master Plumber files the plumbing, the licensed electrician files the electrical, and Anajur runs the home-improvement scope and the rebuild as the contractor of record, keeping the licensed filers and inspections in sequence. The value to the homeowner is a single point of accountability for the reconstruction without anyone claiming a license or a filing authority they do not hold.

What unpermitted work actually costs you

The reason to take the permit question seriously is not abstract. Unpermitted work creates a liability that travels with the property and tends to surface at the worst possible moment, when you sell or refinance.

Start with the direct penalty. Under DOB rule 1 RCNY 102-04, work performed without a required permit on a one- or two-family dwelling is assessed at the greater of six times the current permit fee, capped at $10,000, or $600. There is a separate civil-penalty track as well: for an immediately hazardous violation, the Administrative Code sets a civil penalty of not less than $2,500 and not more than $25,000, plus an additional penalty of up to $1,000 for each day the condition goes uncorrected. That $2,500 floor took effect in November 2022. And if the Department issues a stop-work order, the penalty for violating it runs $6,000 for the initial violation and $12,000 for each subsequent violation, payable before the order is lifted.

The larger cost is usually not the fine. It is the open record. Unpermitted work and open violations block the issuance or amendment of a certificate of occupancy, and they show up in title and due-diligence searches. A buyer's attorney finds the discrepancy between what is filed and what was built, and the deal stalls until it is resolved. Lenders balk at refinancing against work that was never legalized. The repair that seemed faster and cheaper without a permit becomes a cloud on title that you pay to clear later, on someone else's timeline.

If prior unpermitted work already exists, there is a path to legalize it. It runs through a retroactive as-built filing in DOB NOW, a full plan examination, the required inspections, and payment of the civil penalty before a permit issues. Voluntary pre-violation legalization on a one- or two-family dwelling is assessed at $600. There is no statute of limitations that makes the obligation go away, and it lands on the current owner, so inheriting unpermitted work means inheriting the job of legalizing it.

Why a licensed, code-compliant contractor matters

Everything above points to the same practical conclusion: on a water-damage rebuild in New York City, the contractor you choose is a code-compliance decision, not just a price decision. A licensed contractor who reads the permit boundary correctly keeps the job inside the lines, knows when the asbestos survey gates demolition on an older home, knows when the flood zone overrides the exemption, and brings in the licensed plumber and electrician to file under their own seals rather than papering over the filings.

There is a consumer-protection layer that rewards using a properly licensed contractor, too. New York City's Home Improvement Contractor Trust Fund can reimburse a homeowner when a DCWP-licensed contractor fails to complete contracted work or owes money, and as of July 2025 the maximum reimbursement for an approved claim is $20,000. That protection exists only where the contractor held a DCWP license at the time of the contract and paid into the fund. Hire an unlicensed operator and there is no Trust Fund to fall back on, on top of the contract itself being unenforceable for payment under the licensing law.

Anajur has worked Staten Island water-damage rebuilds since 1997, under the DCWP Home Improvement Contractor license, with the permit and licensed-trade coordination handled the way this guide describes. If you are staring at a flooded basement or a storm-damaged ground floor and trying to figure out what the city will require to rebuild it legally, that is a conversation worth having before the first wall comes down.