Bathroom Renovation Plumbing Checklist for NYC Apartments

By Plumbing NYC — Master Plumber | NYC Licensed Master Plumber, 30+ Years Experience, Serving All 5 Boroughs  •  Published October 1, 2026  •  Updated October 1, 2026

Bathroom renovation plumbing in NYC is not like a remodel in the suburbs. Your pipes connect to your neighbors’ pipes, your board has its own rules, and the city enforces its own plumbing code. So the order you do things in matters as much as the fixtures you pick. This checklist walks you through each step, from paperwork to final sign-off. Use it with your contractor, or hand it to our residential plumbing team and we’ll run it for you.

Step 1: Get Your Approvals Before Anyone Picks Up a Hammer

Most apartment renovations stall in the paperwork, not in the walls. Start this step first, because nothing else can move until it’s done.

• Read your building’s alteration agreement. Co-op and condo boards in Manhattan and Brooklyn often have their own rules for wet-area work.
• Ask what the board needs from your plumber. Many boards want a license number and proof of insurance before work starts.
• Find out if your job needs a DOB permit. Swapping a toilet in the same spot usually doesn’t, but moving a fixture or changing pipes usually does.
• If it does, a Licensed Master Plumber files it. For plumbing-only bathroom work, that’s usually a Limited Alteration Application (LAA).
• Book water shutoffs with your super. Some buildings only allow riser shutdowns on set days.

Not sure which jobs need a permit? Our NYC plumbing code guide for homeowners breaks it down. Under city rules, only a Licensed Master Plumber can file an LAA. The NYC Department of Buildings LAA page explains who can file and what it covers.

Step 2: Find Out What’s Behind Your Bathroom Walls

You can’t plan new plumbing until you know what’s already there. In an apartment, some of those pipes aren’t yours, because they serve the whole line of units above and below you.

• Locate your shutoff valves and check that they actually close, since old valves often seize.
• Find the risers and the main stack. These are shared building lines, and you can’t move them without approval.
• Check your supply pipe material. Galvanized steel and old brass often need to go once the wall is open.
• Check your drain pipe material. Old cast iron can crack when you cut into it.
• Note where the vent runs. Every drain needs a vent, and it limits where fixtures can go.

Older buildings hold the most surprises. A Brooklyn brownstone or a Manhattan pre-war co-op can hide pipes that are close to 100 years old. If that’s your building, read our guide to plumbing problems in NYC pre-war buildings before you finalize your plan.

Step 3: Decide Whether Your Fixtures Stay or Move

This is the biggest choice in any bathroom renovation plumbing plan. It drives your timeline, your permit, and your price.

Keeping the toilet, tub, and sink where they are is the simple path. The drain lines and vents stay put, and you may not need a permit at all.

Moving a fixture is a different job. A toilet needs a large drain line that slopes steadily down to the building stack. In a Queens co-op with a concrete slab, that slope can be hard to get. Moving a shower can mean new venting, too. It can be done, but plan for it from day one, not halfway through.

• Mark every fixture on a floor plan: stays, moves, or new.
• Ask your plumber how far each moved fixture sits from the stack.
• Confirm with the board that floor or ceiling work is allowed. Some buildings limit coring through slabs.

Step 4: The Rough-In Checklist

Rough-in is the plumbing that goes inside your walls and floor before tile goes up. Once the walls close, mistakes get expensive, so check every item below while you can still see the pipes. Our rough-in plumbing service covers this whole stage.

Step 5: Pick Fixtures That Meet NYC Water Limits

New fixtures in NYC must meet the city’s flow limits. Most fixtures sold today already do, but check the spec sheet before you buy, especially for imported or designer pieces.

Source: NYC Plumbing Code, Table 604.4. Rain heads and multi-head showers need extra care, because the code also caps the total flow for a whole residential shower stall, not just each head. Ask your plumber to check the combined number before you order.

Need help with the install itself? See our plumbing fixture installation service.

Step 6: Inspection, Testing, and Sign-Off

If your job has a permit, it isn’t done when the tile is grouted. It’s done when the DOB signs off, so plan for that from the start.

• Don’t close walls on permitted work until your plumber confirms the inspection timing.
• Run every fixture for several minutes and look for drips under the sink and behind the toilet.
• Check the shower temperature. It should not get hotter than your valve’s limit.
• Check your water pressure at each fixture. Weak flow after a renovation often points to a blocked or undersized line. Our guide to low water pressure in NYC apartments explains the usual causes.
• Ask your downstairs neighbor to check their ceiling after the first week of use.
• Keep copies of the permit, the sign-off, and your plumber’s invoice, because your board and future buyers will ask for them.

Your Bathroom Renovation Plumbing Checklist at a Glance

Want a plumber who handles all six phases? Plumbing NYC runs bathroom renovation plumbing in Manhattan, Brooklyn, Queens, the Bronx, and Staten Island. See our bathroom plumbing and shower service for more.

Frequently Asked Questions