All work must be approved by the Board; this usually takes place with a privately scheduled meeting of the board members. All architectural plans, permits must be issued and approved, contractor scheduling coordinated with the building management and super, elevators secured and booked ahead of time, etc., etc.; some buildings only allow cvertain type of work to take place in the summer months so as not to disrupt the ebb and flow of the building owners, what with nannies and children and strollers etc; it all depends on the building. Additionally, dumpsters have to be stationed outside the building along with ancillary permits issued by the Sanitation Department so as to ensure that contstruction detritus and debris is hauled off in a timely manner as well as ensure that parking is available. Licensed contractors only inlcuding plumbers, painters, etc. Before embarking on any kind of work, you should check out the terms of your Proprietary Lease with the help of your real estate attorney to make sure you are covered in terms of any liabilities.