Removing a wall in New York City will normally require a permit. You must hire an architect to prepare the plans and documentation needed to submit a modification. You must hire an architect to prepare the plans and documentation needed to file a modification with the New York City Department of Buildings. A general contractor can request permission after the architect's plans are approved. Generally speaking, a DOB permit is not required for “cosmetic or surface improvements”.
This includes painting, wallpapering and coating floors. Building a wall in New York requires a permit. This means that you will have to hire an architect and submit the plans to the Department of Buildings to obtain a permit before construction can begin. For example, installing new kitchen cabinets doesn't require a permit, but contractors must have a home improvement contractor (HIC) license from the Department of Consumer Affairs.