New York City requires DOB plans and a building permit for a new deck or porch and for structural deck work; only qualifying ordinary repairs or minor alterations avoid that filing.
Zoning, rear-yard and lot coverage, egress, structural design, fire separation, landmarks, and property-line rules remain separate.
What this tells youComputed rule answer
How precise this isComputed rule answer
Official data checkedNYC DOB deck project requirements
Next stepCheck official deck/accessory-structure rules with deck dimensions and height.
New deck or porchDOB plans and building permit required
Structural alterationDOB plans and building permit required
Possible exceptionOnly qualifying ordinary repairs or minor alterations, subject to DOB scope