Bathroom remodel in Staten Island, a borough of houses, not towers

Staten Island is the one borough of New York City that never got built up. Walk most residential blocks here and you are looking at a house with its own yard and its own plumbing run, not an apartment sharing a stack with the units above and below — a housing stock that looks a lot more like a New Jersey or Long Island suburb than it does Brooklyn or the Bronx. That changes which questions matter. The co-op board approvals and shared cast-iron stacks that dominate advice written for “New York City” bathrooms barely apply here. What actually matters on this island is what is sitting in the basement, whether the street was ever connected to a sewer main, and whether the house sits in a flood zone that changed the rules after 2012. Here is what is specifically true about remodeling a bathroom in this borough.

A borough of houses, not towers, and a median build year of 1973

This is worth establishing with real numbers because it changes everything downstream. The Census Bureau's 2024 American Community Survey puts Staten Island at roughly 185,800 housing units, and of those about 63,500 are detached one-family homes and 47,400 are attached one-family homes — add another roughly 41,800 two-family homes, and just over 82 percent of the borough's housing sits in one- or two-family structures. The same survey puts the median year a Staten Island home was built at 1973.

The practical upside is real: most homeowners here own their entire plumbing run rather than sharing a waste stack with neighbors, so moving a drain or adding a fixture is rarely the multi-party negotiation it is in a Manhattan co-op. The practical catch is that a house built in the early 1970s commonly still has its original cast-iron waste lines, and often a finished or semi-finished basement that predates every flood-resistant construction rule the city has adopted since. That basement, not a shared stack, is where a Staten Island bathroom project usually runs into something nobody planned for — more on that below.

The permit runs through the same citywide system — but it is still two filings, priced an unusual way

Staten Island bathroom remodels go through the identical Department of Buildings process as the rest of the city: filed through DOB NOW: Build, generally as an Alteration Type 2 (Alt-2) job. Where this differs from a Westchester or Long Island suburb is the fee structure. Neither Yonkers' per-fixture plumbing charge nor Huntington's flat plumbing fee applies here — New York City's Administrative Code (Table 28-112.2) prices both the general alteration filing and the separate plumbing filing off the same formula, applied to two different declared construction costs. For a one-, two- or three-family dwelling, the alteration permit carries a minimum filing fee of $170 for the first $5,000 of declared alteration cost, plus $5.15 for every $1,000 above that — and that cost figure explicitly excludes anything related to plumbing.

That last detail is why the plumbing needs its own filing: the Alt-2 cost calculation is written to leave plumbing out, so plumbing work is filed and billed separately, off its own declared cost, using that same $170-plus-$5.15-per-$1,000 formula. Run a realistic $25,000 bathroom split roughly $18,000 general construction and $7,000 plumbing, and the two filings come to about $237 and $180 — a little over $400 combined, well under the $1,500–$6,500 in “DOB fees” some renovation lead-generation sites quote, which usually bundle in architect and expediter charges rather than the permit fee itself. DOB revises this schedule periodically — a fee bulletin took effect February 2, 2026, changing several related alteration charges — so confirm the current numbers before you budget them.

Only a Licensed Master Plumber can file that second permit, and there is no homeowner exemption

New York City requires plumbing work — supply lines, drain lines, venting, all of it — to be filed and supervised by a Licensed Master Plumber (LMP) holding a Department of Buildings license, full stop. Some New York suburbs carve out an exception letting a homeowner do plumbing work in their own one- or two-family house without a license; New York City does not offer that exemption anywhere in its five boroughs. If the person doing your tile and vanity work is not personally an LMP, a licensed one has to be attached to the job, and their name and license number belong on your contract before you sign, not just on the permit application after the fact.

DOB publishes a free public tool — Check License & Registration Status, on the Buildings section of nyc.gov — where you can look up any licensed trade, plumbers included, by name or license number. It takes a couple of minutes and most homeowners never run it. The alternative is finding out mid-project, or worse at a home sale or insurance claim, that the plumbing on your bathroom was never actually filed by anyone licensed to do it.

Adding a fixture below grade is where Appendix G gets involved

Staten Island took a disproportionate share of Hurricane Sandy's damage in 2012. FEMA logged 10,904 individual-assistance inspections on the island afterward, and among the properties inspected, 31 percent had first-floor flooding up to four feet, another 25 percent had living space flooded higher than that, and 39 percent had basement-only flooding — a combined 95 percent of inspected Staten Island properties with some form of flood damage. The city's NY Rising Enhanced Buyout Program went on to demolish 473 homes on Staten Island outright, according to the Comptroller's October 2022 Ten Years After Sandy report. Separately, the NYC Department of City Planning's Floodplain by the Numbers report puts roughly 49,000 Staten Island residents inside the combined FEMA 1% and 0.2% annual-chance floodplains, per the 2010 Census — a meaningful share of a borough with under 200,000 housing units total.

The part that actually touches a bathroom remodel: NYC Building Code Appendix G, the flood-resistant construction rules DOB adopted after Sandy, allows in-kind replacement of a plumbing fixture below the design flood elevation without extra requirements. Installing a new fixture that increases the fixture count in a space below that elevation is a different matter — Section G102.1 requires backflow prevention and/or sewage ejection in that case. In plain terms: swapping the toilet in an existing basement bathroom is generally routine; adding a second bathroom, or a first one, in a basement or ground floor that sits inside a mapped flood zone is a conversation to have with your contractor before demo, not after. Not every Staten Island address is in a mapped zone — this applies specifically to the East Shore, South Shore and other FEMA-mapped areas, and it is worth checking your own address against FEMA's flood maps rather than assuming either way.

Parts of the South Shore were not on a sewer main until surprisingly recently

This is the wrinkle that is purely local to this borough. Staten Island's sewer buildout reached its South Shore later than the rest of the city, and the Department of Environmental Protection has spent much of the last two decades closing that gap street by street: it connected 100 homes in Pleasant Plains ($20.8 million) and 107 homeowners in Tottenville ($11.4 million) by mid-2010, brought roughly 150 Rossville homes onto the sewer main in a $24 million project completed in 2014, and let 114 homeowners in Arden Heights and Annadale discontinue septic use in a further $23 million project finished in January 2015. A separate $48 million project begun the same year was still connecting close to 600 more homes in the Woodrow area as late as 2017.

New private septic systems are tightly restricted inside city limits for exactly this reason: the Rules of the City of New York (Title 24, §8001-01) bar the Department of Health and Mental Hygiene from permitting an individual on-site sewage disposal system anywhere DEP determines a public sewer connection is feasible. In practice that means any septic or cesspool system still running on Staten Island today is almost certainly a legacy system rather than a new one. If your house sits on a South Shore street that was sewered within the last fifteen years or so, it is worth confirming with your plumber whether you are actually on the city main before you add fixture count — a septic system sized for the original house was never engineered around a second full bath.

Why nobody can honestly quote you an average Staten Island bathroom price

Every other page on this search will hand you a number. We looked for one specific to Staten Island, or even to New York City broadly, with an actual stated methodology and sample size, and did not find one. The lead-generation sites that surface first disagree with each other by a wide margin — quoted “New York” bathroom remodel ranges swing from roughly $8,000 to $85,000 depending on which site you land on, and none of them disclose how the figure was built. The remodeling industry's Cost vs. Value data, the most credible source of this kind of number nationally, reports at the metro level (New York–Northern New Jersey–Long Island), not by borough, so even that more credible figure is not something we could verify down to a Staten Island-specific number. Repeating one of those ranges here would be a guess wearing a citation, so we will not.

What we can tell you is what actually moves the number for a Staten Island bathroom specifically: whether the plumbing filing is a straightforward reuse of what is there or a full re-pipe of 1970s-vintage lines, whether the project is in a mapped flood zone and adds fixture count, and whether the house is on a sewer main that has been there for decades or one connected within the last fifteen years. Our bathroom remodel cost guide breaks down how those pieces stack up so you can read a real quote critically, which is worth more than an invented average.

ZIP codes we cover in Staten Island

10301, 10302, 10303, 10304, 10305, 10306, 10307, 10308, 10309, 10310, 10311, 10312, 10314

Common questions

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