Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your New York City ADU cost →Building an ADU in New York City costs between $150,000-$300,000 for new construction, with per-square-foot costs averaging $300-$600. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $120,000-$260,000, while prefab/modular ADUs fall in between at Rarely feasible (site access/crane limits).
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | $5,000-$10,000 |
| Impact Fees | Varies by borough |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. Get up to 3 free quotes from ADU builders serving New York City — no obligation.
Get New York City builder quotes →Permit fees in New York City are $5,000-$10,000. The review timeline is 120-180 days, with plan check: 6-8 weeks. Impact fees are Varies by borough. Pre-approved plans: Yes — DOB/HPD Pre-Approved ADU Plan Library launched with 11 designs (growing); pre-reviewed for code compliance for faster approval.
| 1-Bedroom Rent | $2,200-$3,200/month |
| 2-Bedroom Rent | $2,800-$4,200/month |
| Annual Rental Income (est.) | $32,400/year |
| Payback Period (est.) | 6.9 years |
| Short-Term Rental | Heavily restricted (primary unit rule) |
| Overall ROI Estimate | 4-6% annual return |
A typical ADU in New York City generates approximately $32,400 per year in rental income based on average 1-bedroom rents. At an average construction cost of $225,000, the estimated payback period is 6.9 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in New York City and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in New York City: $120,000-$260,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: Rarely feasible (site access/crane limits).
3. Pre-approved plans — available in New York City, which can save $3,000-$10,000 in design costs and 2-3 months in review time.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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