NYC ADU Permit Fee Calculator
Estimate the New York City Department of Buildings permit fees for an Accessory Dwelling Unit under City of Yes. Powered by the DOB work-permit fee schedule, with each line item linked to the underlying NYC Administrative Code / 1 RCNY §101-03 citation.
Project details
About this calculator
New York City DOB permit fees are based on the estimated cost of work (NYC Admin Code §28-112.3), not square footage. For a 1–2-family alteration, the work-permit fee is $130 for the first $5,000 of cost plus $5.15 per $1,000 above that (Table 28-112.2 / 1 RCNY §101-03), plus a flat $45 records-management fee. This calculator derives the estimated cost of work from your square footage using a documented per-sqft basis.
City of Yes ADUs
City of Yes for Housing Opportunity (Local Laws 126 & 127, 2024) permits ADUs up to 800 sqft on 1- and 2-family lots citywide, subject to rear-yard, side-yard, historic- district, and flood-zone rules. Use the A-du test-fit tool to check feasibility for a specific lot.
Estimate only
Figures are best-effort estimates for planning. Detached new-building ADUs are billed differently from alterations, and additional sub-permit and surcharge fees may apply. Confirm final fees with the NYC Department of Buildings.