Yes — Structural and Waterproofing Work Require Special Permits
Any project that alters a foundation, structural wall, or drainage system requires a specific DOB permit under NYC Building Code Chapter 33. While basic cosmetic waterproofing may not need a permit, foundation underpinning, sump systems, or exterior excavation do. These involve soil stability and building safety, so licensed engineers must file plans and oversee inspections.
Permit Types Explained
• General ALT-2 permit: Covers interior waterproofing, vapor barriers, and drain installations.
• ALT-1 permit: Needed if converting space to habitable use or changing occupancy.
• Structural permit: Required for underpinning, slab replacement, or wall reinforcement.
• Plumbing permit: Needed when connecting sump or drainage systems to sewer lines.
Inspection Process
Waterproofing requires Special Inspection certification for foundation work, sealants, and vapor barriers. Inspectors verify material ratings, sump operation, and discharge compliance with DEP stormwater rules. These inspections protect both homeowner and neighboring properties from water intrusion risks.
Timeline & Coordination
Filing multiple permits simultaneously speeds approval. Coordinate with the contractor’s expeditor and structural engineer to align submissions and avoid rejections. Allow 4–8 weeks for full permit review depending on scope and site location.
Find detailed filing instructions at NYC basement waterproofing & permit filing service.