New York, NY HOA Rules: Architectural Review (2026)

Most NYC co-op and condo buildings require unit owners/shareholders to submit an alteration agreement before making any changes beyond cosmetic updates. The alteration agreement typically requires: detailed plans prepared by a licensed architect or engineer, proof of insurance naming the building as additional insured, a contractor agreement, and a security deposit (commonly $5,000-$25,000). The board reviews the scope of work and may impose conditions — co-op boards have broader discretion under the proprietary lease. Common restrictions include: no changes to building facades, no relocation of plumbing risers, no structural modifications without engineering review, and mandatory use of building-approved contractors. Work hours are typically limited to 8 AM-5 PM weekdays. In Landmark-designated buildings or historic districts, the NYC Landmarks Preservation Commission (LPC) must also approve exterior changes. All non-cosmetic work requires a DOB work permit. Condo bylaws often restrict alterations to common elements (hallways, lobby, roof) to board-approved projects only.