ADU Rules in New York, NY — 2026 Guide
Check if your New York property qualifies for an ADU in 20 seconds
New York ADU Rules at a Glance
New York has limited ADU support. Here is what you need to know.
- NYC legalized basement and cellar apartments citywide in 2024 under the "City of Yes" plan.
- Detached backyard ADUs remain restricted in most districts.
- Conversions must meet egress, ceiling height, and flood-zone safety standards.
- ADU regulations vary significantly across the five boroughs.
What ReadyPermit Checks for New York Properties
Enter any New York address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your New York lot is zoned for ADU construction under current NY and local rules.
Setbacks & Coverage
Check required setbacks, lot coverage limits, and height restrictions for your specific parcel.
ADU Size Limits
Calculate the maximum ADU square footage allowed based on your lot size and primary dwelling.
Permit Requirements
Understand what permits and approvals New York requires before you can break ground.
Flood & Hazard Zones
Identify if your property falls in a flood zone, fire zone, or other hazard overlay.
Lot & Parcel Data
Pull parcel boundaries, lot dimensions, and existing structures from county records.
Check Your New York Property Free
Enter your address below. In under 20 seconds you will know if your New York lot qualifies for an ADU — no phone calls, no waiting.
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