You have found the perfect layout for your apartment. The kitchen moves to where the dining room used to be, and a second bathroom goes where there’s currently a closet. Then your board says no, citing the “wet over dry” rule.
This rule surprises many New York City apartment owners, and it can reshape an entire renovation. Here is what it means, why buildings enforce it and what options you may have.
What Is the Wet Over Dry Rule?
In apartment buildings, “wet” areas are rooms with plumbing and water: kitchens, bathrooms and laundry areas. “Dry” areas are living spaces like bedrooms, living rooms and dining rooms.
The wet over dry rule says you cannot place a wet area directly above a neighbor’s dry area. In other words, you generally can’t build a new bathroom or kitchen over the bedroom or living room of the apartment below you.
The rule is not part of the NYC building code. It is a building-specific rule set by co-op and condo boards, usually found in the alteration agreement or house rules. That means how strictly it is applied varies from building to building.
Why Buildings Enforce It
The reason is simple: water damage. When a pipe leaks or a shower pan fails over another bathroom, the damage is usually limited and easier to repair. When it happens over a bedroom or living room, it can ruin ceilings, walls, floors and furniture in a neighbor’s home.
There is also a practical plumbing reason. In most buildings, kitchens and bathrooms are stacked vertically so they share drain and vent lines. Moving a wet area away from those stacks means running new pipes horizontally, which can be difficult or impossible depending on the building’s structure.
What the Rule Usually Affects
- Moving a kitchen to a different part of the apartment
- Adding a new bathroom in a space that was previously a bedroom or closet
- Expanding a bathroom into an adjacent dry room
- Adding a washer and dryer in some buildings
- Combining apartments, where layouts often shift wet areas
Updating a kitchen or bathroom in its current location is usually not affected, because you are keeping wet over wet.
Are There Exceptions?
Sometimes. Some boards will consider exceptions, particularly when:
- You own the apartment below, or the unit below is a duplex you control
- The space below is also a wet area or a non-living space
- The design includes enhanced waterproofing, such as full-floor membranes, drip pans or leak detection systems
- The building’s engineer approves the plumbing plan
Every exception is at the board’s discretion. Even when approved, you should expect stricter requirements, additional engineering review and possibly an agreement to take responsibility for future leak damage.
How to Plan Around the Rule
Check your building’s rules before designing. Ask your managing agent for the alteration agreement and house rules, and look for wet over dry language.
Find out what is below you. Your managing agent or building’s architect may be able to tell you the layout of the apartment below.
Stay close to the existing stacks. Designs that keep kitchens and bathrooms near their current locations are faster to approve and less expensive to build.
Work with a team that knows buildings. An architect and contractor who renovate NYC co-ops regularly can tell you early what is likely to be approved.
Plan for extra waterproofing. If your board allows an exception, expect to invest in enhanced waterproofing, and make sure your contractor installs it correctly.
Waterproofing Matters Either Way
Whether or not you move a wet area, waterproofing is the most important part of any bathroom or kitchen renovation in an apartment. Proper membranes, correct slopes to drains and flood testing before tile installation protect you, your neighbors and your relationship with your board.
How Dacaj Helps
Dacaj Construction has worked in NYC co-ops and condos since 2006. We review your building’s rules with you at the start, work with your architect on layouts that can realistically be approved and build waterproofing systems that meet or exceed building requirements.
Learn more about our bathroom renovation and kitchen remodeling services, or call (917) 564-1006 to schedule a free consultation.