Bathroom remodel in Brooklyn, where the permit forks before the tile does
Brooklyn is its own county — Kings County — and on paper it runs on the same rules as the rest of New York City: the same Department of Buildings, the same DOB NOW filing system, the same construction codes. What is different is what is actually behind the wall, and how the paperwork splits depending on what you are asking a contractor to do. Just under half of Brooklyn's housing was built before 1940, a true single-family house is genuinely rare here, and a bathroom remodel can be filed two entirely different ways depending on a dollar figure most homeowners have never heard of. None of that makes a Brooklyn bathroom harder to do well. It means the sequence matters, and it is worth knowing before you get a quote, not after.
Brooklyn's housing stock, in the actual numbers
According to the Census Bureau's 2024 American Community Survey (1-year estimates), Brooklyn has about 1,122,521 housing units, and 543,541 of them — roughly 48 percent — were built in 1939 or earlier. At the other end, only about 50,812 units, or 4.5 percent, are true single-family detached houses. Roughly 40 percent sit in the borough's classic one-unit-attached, two-unit, and three-to-four-unit rowhouses and brownstones, and just over half — about 55 percent — sit in buildings of five units or more.
What that means in practice: whether your bathroom is in a two-family brownstone or a fifty-unit building, it is almost never plumbing you own outright end to end — a shared wet wall or a shared vertical stack is the norm here, not the exception. And because so much of the stock predates 1940, construction from that era typically started with galvanized supply lines and cast-iron waste stacks. That is a reasonable expectation for what is behind a pre-1940 wall, not a guarantee about yours — decades of prior repairs may have already replaced some of it. Ask your contractor what they expect to find and what happens to the price if they find something else, before signing.
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Two different DOB filings, and which one you need depends on a number: $35,000
A Limited Alteration Application (LAA1) can be filed directly by a Licensed Master Plumber, with no architect or engineer involved at all, for water plumbing work that includes new fixtures and plumbing piping systems — exactly what a straightforward bathroom remodel is. The catch is a real dollar cap: Category 1 LAA1 work is capped at $35,000 per building, including appliances and labor, in any 12-month period. A remodel that keeps the same footprint and swaps fixtures and piping in place will often fit inside that cap.
Cross that cap, or reconfigure the room — move a wall, relocate a fixture beyond an incidental adjustment, combine two bathrooms, add a bath where none existed — and the project needs a full Alt-2 alteration application instead. That filing has to be submitted by a Registered Architect or Professional Engineer through DOB NOW: Build, with the plumbing scope documented under its own schedule and executed by a Licensed Master Plumber. Ask directly which track your project is actually on before you sign anything, since it changes who has to be involved, not just what it costs.
What DOB actually charges, in the current fee table
Under the current schedule in NYC Administrative Code §28-112.2, a one-, two-, or three-family building pays a minimum of $130 for the first $5,000 of declared construction cost, plus $5.15 for each $1,000 (or fraction of it) above that. Larger buildings — condos, bigger multifamily — are billed on a steeper tier: $195 for the first $3,000, plus $20 per $1,000 for the next $2,000, plus $10.30 per $1,000 above $5,000.
Run the arithmetic on a realistic job and it stops being abstract. On $25,000 of declared work in a one-, two-, or three-family building, that is $130 + (20 × $5.15) = $233. The same $25,000 job in a larger building works out to $195 + $40 + (20 × $10.30) = $441. Fee schedules do change, so confirm current figures before budgeting — what will not change is that this is a real, checkable number, and a quote that rounds it into a vague “permits: $500” line has not actually looked it up. Our bathroom remodel cost guide covers how to read a quote critically.
The Brooklyn borough office moved — and it is not where you file anymore anyway
DOB's Brooklyn Borough Office is at 345 Adams Street, 3rd Floor, Brooklyn, NY 11201. It relocated there in November 2022 from its longtime home at 210 Joralemon Street. Customer service can be reached at (718) 802-3675, and Certificate of Occupancy questions specifically go to (718) 802-3680. The office also runs walk-in “Buildings After Hours” sessions the first and third Tuesday of each month, 4 to 7 p.m., for anyone who cannot get there during standard 8:30-to-4:00 hours.
What the office is no longer for is actually submitting your filing. Plumbing and alteration applications go through DOB NOW: Build online — the department stopped accepting paper filings some years ago — so the borough office now mostly handles records requests, Certificate of Occupancy questions, and in-person plan-exam appointments. A homeowner calling to “drop off” a permit application in Brooklyn will be told to file it online instead.
Rowhouses, brownstones, and layouts that do not forgive a bad call
A Brooklyn rowhouse or brownstone bathroom is usually narrow, often without an exterior wall of its own, and built around a wet wall it shares with the unit above, below, or both. In that kind of building, moving a drain is a bigger undertaking than in a house where you own the entire plumbing run — door swing, vanity storage, and whether a tub-to-shower conversion actually gains floor space or just relocates the problem all matter more when there is so little room to correct a bad call once the plumbing is set.
And because just over half of Brooklyn's housing sits in buildings of five units or more, co-op or condo board sign-off is a real possibility on top of whatever DOB requires — ask early whether your building has its own approval process. If accessibility is part of why you are remodeling, our guides on tub-to-shower conversions and walk-in and accessible showers cover what the plumbing actually has to do to support it.
Why no one can honestly quote you an average Brooklyn bathroom price
It is worth being straight about this, because every other page you will find on this search tries to give you a number. Remodeling/Zonda's annual Cost vs Value report is the one source built for exactly this question, and it does track cost against resale value across roughly 115 U.S. markets using contractor-estimate data and real-estate-professional surveys — but its published breakdown does not split results out by borough, and we could not get independent, verifiable access to a current New York City figure from the report itself. The numbers circulating under Brooklyn's name elsewhere come from contractor lead-generation and blog content with no disclosed sample size or methodology, and they range from roughly $15,000 to $90,000-plus for what is described as the same project — a spread that on its own tells you these are not measurements of the same thing.
What is actually knowable here: the DOB fee math above, whether your plumbing scope stays under the $35,000 LAA1 cap or needs a full Alt-2 with an architect, whether your building's wet wall is shared, and what a pre-1940 wall is likely to have behind it. Our guide on how to hire a bathroom remodeler walks through what else to verify before you sign.
ZIP codes we cover in Brooklyn
11201, 11203, 11204, 11205, 11206, 11207, 11208, 11209, 11210, 11211, 11212, 11213, 11214, 11215, 11216, 11217, 11218, 11219, 11220, 11221, 11222, 11223, 11224, 11225, 11226, 11228, 11229, 11230, 11231, 11232, 11233, 11234, 11235, 11236, 11237, 11238, 11239, 11241, 11242, 11243, 11249, 11252, 11256
Common questions
Do I need a permit for a bathroom remodel in Brooklyn?
Yes, but which one depends on scope. A remodel that swaps fixtures and piping without moving walls, at or under $35,000 in declared plumbing cost per building per year, can be filed as a Limited Alteration Application (LAA1) directly by a Licensed Master Plumber — no architect needed. Anything that reconfigures the room, relocates a fixture beyond a minor adjustment, or crosses that cap needs a full Alt-2 alteration application filed by a Registered Architect or PE through DOB NOW: Build.
What does the permit actually cost?
Under NYC Administrative Code §28-112.2, a one-, two-, or three-family building pays $130 for the first $5,000 of declared cost plus $5.15 per $1,000 above that — $233 on a $25,000 job. Larger buildings are billed on a steeper tier: $195 for the first $3,000, $20 per $1,000 for the next $2,000, and $10.30 per $1,000 above $5,000, which comes to $441 on that same $25,000. Confirm current figures before budgeting, since fee schedules change.
Does my plumber need a specific license?
Yes. NYC permits for plumbing work are only issued to a Licensed Master Plumber, and only that license holder can be the applicant on either an LAA1 or the plumbing schedule of a full Alt-2 filing. A general remodeler who is excellent at tile cannot pull this permit unless they hold the license themselves — ask for the name and license number before you sign.
My building is from before 1940. What should I expect behind the tile?
Roughly 48 percent of Brooklyn's housing was built in 1939 or earlier, per the Census Bureau's 2024 American Community Survey, and construction from that era typically started with galvanized supply lines and cast-iron waste stacks. That is a reasonable expectation, not a guarantee about your specific wall — ask your contractor what they expect to find and what happens to the price if they find something else.
What will a Brooklyn bathroom remodel cost?
We will not invent a number. The one report built for this question, Remodeling/Zonda's Cost vs Value survey, does not break its results out by borough, and we could not independently verify a current New York City figure from it directly. Figures published under Brooklyn's name elsewhere come from lead-generation sites with no disclosed methodology and range from about $15,000 to $90,000-plus for ostensibly the same project. What actually drives the number here is whether your plumbing scope stays under the $35,000 LAA1 cap, whether the stack is shared, and what is really behind a pre-1940 wall.
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