Can I patch my own walls in a NYC apartment?
Cosmetic repairs — filling nail holes, patching small cracks, touching up paint — are generally fine to do yourself in both owned and rented units without any formal process. The line gets complicated when work involves opening walls, replacing sections of drywall, or anything that might affect shared building systems (plumbing, electrical, HVAC chases).
In a co-op or condo, most buildings have alteration agreements that require board approval for work beyond cosmetic repairs. The threshold varies by building, but it's usually defined in your house rules. Rental apartments require landlord permission for any alterations, which in most NYC leases means you need written approval before doing anything beyond patching nail holes.
The practical answer is: for a three-inch crack or a small patch, do it yourself and don't worry about it. For anything involving a significant section of wall or ceiling, check with your building management first.
My walls are plaster, not drywall. What's different about repairing them?
Pre-war NYC apartments almost always have the original three-coat plaster over wooden lath. This is a completely different material from drywall and it requires different repair products and techniques.
The most important thing to know is that standard joint compound does not bond reliably to old plaster. It shrinks more than plaster as it dries, the bond is weak, and patches made with joint compound on plaster typically crack or fall off within months to a year.
For small repairs on plaster walls, use a plaster repair product such as Durabond 45 (a setting compound that gets harder as it cures rather than just drying) or a dedicated plaster patching compound. Mix to the consistency of peanut butter for small holes. For large sections of failed plaster, you're really looking at either professional replastering or removing and replacing with drywall. Both require more work and cost than the equivalent drywall repair.
How do I know if my plaster is failing?
The tap test. Knock on the wall with your knuckles. Sound plaster has a solid, slightly hard sound. Plaster with failed keys — the mechanical locks that hold it to the lath — sounds hollow, almost like knocking on a cardboard box. This hollow sound means the plaster has lost its bond and may sag or come down.
Visually, failing plaster often shows cracks in a map or spider-web pattern (called crazing), sections that appear to sag slightly from the vertical, or edges at cracks that feel like they're floating rather than solid. In severe cases you can actually see the plaster moving slightly when you press on it.
Small areas of hollow plaster that aren't cracked or sagging can sometimes wait. Large areas of hollow plaster, or any section that is visibly sagging, should be addressed soon — not because the building is at risk, but because plaster coming down is a mess and can cause damage to floors and furniture below.
Do I need a permit to replace drywall in my NYC apartment?
For work that involves removing and replacing existing drywall or plaster in the interior of a unit, NYC building code generally does not require a permit for like-for-like replacement of interior finish materials. However, there are exceptions: work that affects fire-rated assemblies (party walls, corridor-adjacent walls) or that involves modifying any structural elements does require permits.
The NYC Department of Buildings (DOB) has a property search tool on their website where you can look up open permits and violations on any building, which is useful context for understanding how actively managed your building is. The DOB's guide to permits has a section specifically on residential interior work that's worth reviewing.
Practically speaking, your co-op or condo board may have requirements that go beyond the DOB's permit thresholds. A building can require approval for work the city doesn't require a permit for. Check your house rules.
What is Type X drywall and do I need it?
Type X is 5/8-inch fire-rated drywall. It's required by NYC building code in specific locations in multi-family buildings: party walls (between units), walls adjacent to public corridors, and some utility and mechanical rooms.
You can identify it by the thickness (5/8-inch vs. the standard 1/2-inch) and by the "Type X" or "Fire" designation typically printed on the back of the panel. If you pull out a section of existing drywall in a shared wall or a wall adjacent to a hallway and it's 5/8-inch, replace it with Type X.
Using 1/2-inch standard drywall in a location that requires Type X is a code violation and a potential liability issue. The cost difference is modest — Type X drywall runs about $1–2 more per panel than standard — so there's no reason to use the wrong material if you're doing the repair properly.
The apartment above me flooded and damaged my ceiling. Who pays?
This is a common situation in NYC stacked buildings and the answer depends on the cause and your building's governing documents.
If the leak came from a building system (a main supply line, shared drain stack, or building-wide plumbing), the building is typically responsible for repairing both the source and the resulting damage. If the leak came from the apartment above (overflowed tub, burst appliance supply line, condensate drain clog), responsibility depends on your co-op or condo bylaws and sometimes the specific circumstances of how the leak occurred.
Document everything immediately — photos with timestamps, written notice to management, any communications. Your building management should be notified in writing as soon as damage is discovered. Many NYC co-op and condo buildings require written notification within a specific timeframe after water damage for insurance and warranty purposes.
In a rental, the landlord is responsible for repairs to the structure and building systems. If the damage came from another tenant's negligence, the landlord may pursue that tenant, but the repair of your unit is the landlord's responsibility.
How do I find a good drywall contractor in NYC?
Word of mouth from neighbors in your building is the most reliable source. Buildings with similar age and construction produce similar problems, and a contractor who has worked in your building or in similar buildings nearby will know what they're dealing with before they walk in the door.
For buildings that require alteration agreements, your building management office often has a list of approved or preferred contractors. Using someone from this list reduces the administrative friction of getting work approved.
Yelp and Google reviews are less reliable for specialty trades like plastering and drywall in NYC than they are for more common services. Look specifically for reviews that mention pre-war buildings, plaster work, or co-op renovations — those are the most relevant to the specific challenges of older NYC housing stock.
Get at least two quotes and ask each contractor specifically whether they have experience with the type of walls in your building (plaster vs. drywall, and the approximate age of the building). A contractor who has to ask what three-coat plaster is probably isn't the right person for a pre-war repair.
Can I convert my plaster walls to drywall?
Technically yes, but it's more complicated in NYC than it sounds. Removing plaster walls in a co-op or condo typically requires board approval and may require permits depending on the extent of the work. In a rental, it's not something you can do without landlord permission.
The practical considerations: replacing plaster with drywall changes the wall profile by roughly 1/2 inch to an inch (depending on what you're doing with the lath). This affects how the trim fits, whether doors still open and close properly, and the appearance of window and door casings — all of which are more visible and more architecturally significant in a pre-war building than in a newer home.
A common compromise is to repair failing plaster in significant areas and hang drywall over intact plaster in rooms where the plaster is sound but you want a fresh surface. This adds thickness but avoids a full demolition and keeps the original lath-and-plaster system in place where it's working.