If you own a one- or two-family home on Staten Island and you’ve been wondering whether you can legally add an apartment in your basement, garage, or backyard, the answer is yes — with conditions. The city’s “City of Yes for Housing Opportunity” zoning reform, passed in late 2024, made accessory dwelling units legal across all five boroughs for the first time. But nearly 18 months into implementation, the experience on Staten Island reveals a gap between what the law allows and what the permit process has actually delivered.

Here’s what Staten Island homeowners need to know right now before starting any ADU project.

What the Law Actually Allows

Under City of Yes for Housing Opportunity, owners of one- and two-family homes in eligible neighborhoods can convert a basement, garage, attic, or backyard structure into a legal rental apartment. On Staten Island — especially in lower-density neighborhoods across the South Shore, Mid-Island, and North Shore — many properties qualify.

The potential rental income is real. Legal ADUs in Staten Island neighborhoods have been generating in the range of $1,800 to $2,500 per month, depending on location and unit size, according to housing analysts tracking the new program.

The city’s Department of Buildings has published a guide to ADU rules and preapproved plans at nyc.gov/site/buildings/codes/adu.page. Homeowners can also use the city’s ADU eligibility tool to check whether their specific address qualifies.

The “City of Not Yet” Problem

Here’s where the reality gets complicated. Multiple Staten Island homeowners who applied for ADU permits in early 2025 found their projects caught in a compliance audit. The Department of Buildings discovered that several filings were not fully code-compliant under the new rules, requiring applicants to revise and resubmit paperwork — or risk stop-work orders on projects that were already underway.

This isn’t a Staten Island-specific problem. Reporting from The City found that the first wave of ADU permits across the five boroughs encountered similar friction, as the rules governing basement apartments and ancillary units only fully took effect in June 2025, months after the zoning change was passed. Projects filed before the implementing rules were finalized had to be reconciled against the new standards.

The practical lesson: homeowners who file without a thorough understanding of the current code requirements risk delays, mandatory revisions, and potential enforcement action.

The Plus One Program: Free Help and Financing

The city and state have tried to address the complexity barrier through the Plus One ADU program, which offers free design assistance and low-cost financing to eligible homeowners. The first application round drew roughly 2,800 homeowners citywide — with Staten Island, Queens, and the Bronx accounting for a large share of applicants, reflecting where the most ADU-eligible properties are concentrated.

In March 2026, Mayor Mamdani’s administration also reopened ADU financing after a two-year pause under the prior administration, making it easier for homeowners to access funds for construction. Applications for the current Plus One round are open through June 12, 2026. Eligible homeowners can learn more at hpd.nyc.gov or contact their local housing development organization.

The Political Context on Staten Island

It’s worth noting that the City of Yes zoning reform was not universally welcomed on Staten Island. Elected officials representing the borough were among the most vocal opponents of the changes, particularly the provisions allowing new housing in neighborhoods previously zoned exclusively for one- and two-family homes. Some community members share those concerns.

For homeowners who do want to move forward, that political backdrop means navigating a permitting environment that is still settling — and being prepared for the process to take longer than it might look on paper.

What You Need to Know

• What’s allowed: Basement, garage, attic, or backyard ADUs on eligible one- and two-family properties across Staten Island under City of Yes for Housing Opportunity.
• Check eligibility: Use the city’s ADU eligibility tool at nyc.gov/site/buildings/codes/adu.page before spending money on plans.
• Free help available: The Plus One ADU program offers free design assistance and low-cost financing. Applications open through June 12, 2026.
• Key risk: Filing incomplete or non-compliant paperwork can trigger stop-work orders. Work with a licensed expediter or architect familiar with the current ADU rules.
• Financing reopened: The Mamdani administration restored ADU financing in March 2026 after a two-year gap.
• Rental income range: Legal ADUs on Staten Island are generating roughly $1,800–$2,500/month depending on neighborhood and unit size.

The opportunity is real, but so is the process complexity. If you’re a Staten Island homeowner considering an ADU, start with the city’s official resources — nyc.gov/site/buildings/codes/adu.page — before committing to any design or construction. For more on tenant and housing rights in New York City, see the HelpNewYork guide to NYC housing court and the latest on what’s happening on Staten Island in 2026.