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Can You Build an ADU in New York City?

ADU rules in New York City are set by local zoning in New York. Many New York cities allow ADUs — here's what to check, plus typical costs ($222,000–$363,000 for a 700 sq ft detached unit).

Construction in New York City runs about 20% above the New York average, so budget toward the higher end of these ranges.

Detached ADU (700 sq ft)

$222,000–$363,000

Garage conversion (400 sq ft)

$69,000–$126,500

Statewide protection

Local rules

What applies in New York City

We do not yet publish a verified New York City ordinance summary. Use this page for a planning-level cost estimate, then check New York City's planning or building department for rules that apply to your parcel.

Estimate your New York City ADU cost

Your property

ADU type

Estimated cost in New York

$222,000 – $363,000

≈ $317–$518/sq ft turnkey · midpoint $292,500

$198,800
Construction
$52,700
Design & permits
$41,000
Site work
ADU rules in New York are set by your city — here's what to check.
  • iSize set locally. This state leaves ADU size limits to your city — typical caps run 600–1,200 sq ft. Check your local code.
  • iParking. Set by local ordinance — commonly 1 space per ADU unless near transit.
  • iOwner-occupancy varies. Owner-occupancy rules are set locally in this state.
  • ✓Lot has room. A 700 sq ft ADU uses about 12% of your 6,000 sq ft lot — comfortably within typical coverage limits.

Rule basis: Local zoning governs — rules vary by city/county

If you rent it out

$1,275–$2,100

est. rent/mo

7%

gross yield

15.4 yrs

payback

~$18,972/yr after a 7% vacancy allowance, before financing & maintenance.

Financed over 20 yrs at 7.5%, the build is about $2,356/mo — vs ~$1,700/mo in estimated rent.

Get your detailed feasibility report →

Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.

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Other New York cities

BuffaloRochesterYonkersSyracuseAlbany

Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.