The short answer
If your renovation moves plumbing, gas, or electrical, takes down or builds walls, or touches structure, it almost certainly needs a filing with the NYC Department of Buildings (DOB) before work starts. If you are only painting, swapping fixtures in place, refacing cabinets, or changing finishes without moving anything behind the walls, you usually do not need a DOB permit — but your co-op or condo board may still require its own approval. When in doubt, ask before demolition, not after. A full gut renovation always involves permits; a cosmetic refresh usually does not.
What needs a permit, and what does not
Needs a DOB filing: moving a kitchen sink or stove, relocating a bathroom, adding or removing walls, changing egress or room layouts, gas line work, new electrical service or panel work, and any structural change. Filings go through DOB NOW, with drawings typically signed by a licensed architect or engineer and licensed trades named on the job. Gas work in particular must be done by a licensed master plumber — no exceptions worth discussing.
Usually does not need a DOB filing: painting, replacing a faucet or toilet in the same spot, new countertops or cabinets in the existing layout, refinishing floors, and replacing appliances without changing the gas or electrical supply. The catch is that "usually" is doing a lot of work. In an older building, opening a wall for a cosmetic job can reveal knob-and-tube wiring, lead paint, or asbestos that turns a simple refresh into permitted work. And in co-ops and condos, the building's alteration agreement governs regardless — many boards still require approval and insurance certificates even for work the DOB would not care about (see our co-op board approval guide).
How long approval actually takes
There is no single answer, and any contractor who gives you one before seeing your drawings is guessing. A straightforward interior alteration filing can move through in a matter of weeks. Jobs that need plan review, corrections back and forth with the examiner, Landmarks Preservation Commission sign-off for a landmarked building or historic district, or board approval on top of the DOB filing take longer — sometimes months. The honest way to plan: treat permit time as part of the project timeline, not as a delay to it. Use the filing period to finalize finishes and order long-lead items, so the crew can move the day the permit is issued.
What permits cost
DOB filing fees themselves are usually the smaller line item — often in the hundreds to low thousands of dollars depending on the scope. The real cost is the professional work around the filing: architectural or engineering drawings, filing and expediting, and the inspections and sign-offs at the end. For a mid-size kitchen remodel or bathroom remodel that needs a filing, budget a few thousand dollars all-in for the permit side of the job, on top of construction. Be wary of any quote that shows no permit cost at all on a job that clearly needs one — that cost has not disappeared, it has just been left out.
What happens if you skip it
Skipping a required permit is a gamble with bad odds in a city where neighbors, supers, and managing agents notice construction. The DOB can issue violations and stop-work orders, which freeze the job until the work is filed and inspected — often with the finished work opened back up for inspection. Your building can halt the job independently under its alteration agreement. Unpermitted work can also complicate a future sale, when a buyer's attorney or inspector asks for sign-offs that do not exist, and it can create problems with an insurance claim if something goes wrong in the unpermitted area.
How to check before you hire
Before you sign with anyone, ask three questions. One: does this scope need a DOB filing, and who prepares it? Two: who is the licensed contractor of record, and are the plumber and electrician licensed? Three: what inspections and sign-offs close the job out? Then verify on the DOB's public Buildings Information System, which lists permits, violations, and filings by address. We handle filings, inspections, and sign-offs as part of our projects across Brooklyn, Manhattan, Queens, and Staten Island — big renovation work only, no handyman jobs — and we will tell you straight if your scope needs no filing at all.
Common questions
- Do I need a DOB permit for a kitchen or bathroom remodel in NYC?
- If the work moves plumbing, gas, or electrical, or changes walls or structure, yes. A cosmetic-only refresh with nothing moved usually does not need a DOB permit, though your building may still require its own approval.
- How long does a DOB permit take in NYC?
- Simple interior alteration filings can be approved in weeks; larger jobs needing plan review, Landmarks sign-off, or board approval take longer. Budget permit time into your schedule before you set a start date.
- What happens if renovation work is done without a required permit?
- The DOB can issue violations and stop-work orders, your building can halt the job, and unpermitted work can create problems with insurance and resale. Fixing it after the fact usually costs more than filing first.
- Does a DOB permit replace my co-op or condo board approval?
- No. They are separate approvals. Most co-op and condo boards require their own alteration agreement, insurance certificates, and licensed contractor before work starts, in addition to any DOB filing.
Related: Full Gut Renovation in NYC · Co-Op Board Approval for Renovations · NYC Renovation Pricing Guide