Construction Permits - New Buildings and Alterations (Midtown West)

Construction Permits - New Buildings (NB) and Alterations (ALT) - ALT1 - ALT 2 - ALT3

DOB divides construction work into two main categories: New Buildings (NB) and Alterations (ALT). Alterations are further divided into three types--ALT1s, ALT2s and ALT3s--depending upon the scope of work. An ALT1 is a major alteration in which the use or occupancy of an existing property changes. Some examples of ALT1s include:

• Changing the occupancy of a one-family home to a two-family home
• Changing the use of a facility from commercial to residential
• Changing the building's egress

An ALT2 is an alteration in which the use or occupancy of a facility does not change, but includes multiple work types, i.e., plumbing and construction. ALT1s and ALT2s must be filed by a registered architect or licensed engineer.

An ALT3 is a minor alteration that involves only one work type such as a curb cut or construction fence. Certain ALT3s do not require detailed plans and can be filed by a non professional.

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