Dormers: Structure + Zoning + Energy
Yes—habitability changes and any roof enlargement (dormers) generally require DOB permits, stamped drawings, and often zoning review. Common delays arise from incomplete structural calcs (header sizing, rafter ties), unclear fire separation at party walls, and missing energy code details for the new roof/wall assemblies.
Egress, Stairs, and Heights
Approvals stall when dormer windows fail emergency escape sizing, stair headroom is under minimum, or guard/handrail specs are vague. Provide window schedules with net clear opening dimensions, full stair sections (rise/run/headroom), and guard/rail details with fastening notes.
Streamline the Filing
Bundle architectural, structural, and energy sheets; include manufacturer cut sheets for skylights and insulation with labeled R-values and vapor control notes. If in a landmark district, submit exterior elevations and materials early. Pre-file RFIs on edge cases to avoid resubmissions.
For an approval roadmap specific to attic dormers, visit our NYC attic remodel permits & dormer compliance guide.