City of Yes for Housing: ADUs, Parking and What Changed in NYC

City of Yes for Housing Opportunity allows backyard and basement ADUs, a 20% affordable housing bonus and fewer parking mandates. What changed and what did not.

By Seayora Editorial Team · Published October 28, 2026 · Facts checked October 28, 2026 · 4 min read

Short answer: City of Yes for Housing Opportunity, adopted by the New York City Council on December 5, 2024, changed the city’s zoning to allow more housing in every neighborhood. Owners of one- and two-family homes can add one accessory dwelling unit of up to 800 square feet, buildings in R6 to R10 districts get about 20% more floor area for permanently affordable homes, and parking mandates for new housing were removed or reduced across much of the city.

Key takeaways

One accessory dwelling unit of up to 800 square feet is allowed per one- or two-family building, with added restrictions where flooding is a concern.
The Universal Affordability Preference adds about 20% more floor area in R6–R10 districts when the extra homes are permanently affordable at an average of 60% of area median income.
Parking mandates for new housing are gone in Zone 1, reduced in Zone 2 and largely unchanged in Zone 3.
Zoning permission is not a building permit: an ADU still needs Department of Buildings approval and must meet the Building Code.

What is City of Yes for Housing Opportunity?

It is a citywide amendment to the text of the Zoning Resolution and the third of the City of Yes amendments, after City of Yes for Carbon Neutrality (approved December 2023) and City of Yes for Economic Opportunity (approved June 2024). The City Council adopted it, with modifications, on December 5, 2024, and the Department of City Planning expects it to enable about 82,000 homes over 15 years (DCP: City of Yes for Housing Opportunity).

Can you add an accessory dwelling unit to your house?

In many cases, yes. Owners of one- and two-family homes can now create one accessory dwelling unit, or ADU, per building, with a maximum size of 800 square feet (DCP final plan). An ADU can be a backyard cottage, a garage conversion, an attic unit or a basement apartment. During public review, rules were added in response to concerns about flooding and neighborhood character, and law firm summaries note that ground-floor and basement ADUs are excluded in some areas (Nixon Peabody). The Department of City Planning’s ADU guide explains which rules apply where.

Count the units, too. Multiple Dwelling Law § 4(7) defines a multiple dwelling as a building occupied by three or more families living independently (MDL § 4), and multiple dwellings carry additional state requirements. Ask an architect how an ADU in a two-family house will be classified before you build; see the certificate of occupancy guide.

What is the Universal Affordability Preference?

In medium- and high-density districts (R6 to R10), the Universal Affordability Preference gives a zoning bonus of about 20% more residential floor area when the additional homes are permanently affordable at an average of 60% of area median income. The Council’s modifications require that 20% of the affordable units be affordable at 40% of area median income in projects of more than 10,000 square feet (New York Housing Conference).

What changed for parking?

City of Yes rolled back parking mandates for new housing with a three-tier system: no parking mandates in Zone 1, reduced mandates in Zone 2 and mandates that largely remain in Zone 3 (DCP applicability map). Zone 1 includes most of Manhattan, Long Island City and parts of western Queens and Brooklyn (Nixon Peabody). Removing a mandate does not ban parking; an owner can still choose to build it.

What else changed?

Town center zoning in lower-density districts, allowing apartments above ground-floor businesses on commercial streets.
Transit-oriented development, allowing modest apartment buildings on certain larger lots near transit in lower-density districts.
Easier conversions of vacant offices and other non-residential buildings to housing.
Rules enabling small and shared apartments, and infill on campuses with existing buildings.

Each of these comes with its own eligibility rules, which the final plan and the Department of City Planning’s maps describe district by district.

Do projects already filed have to follow the new rules?

The amendment included vesting provisions so that applications filed with the Department of Buildings on or before December 5, 2024, the effective date, could continue under the prior regulations (Greenberg Traurig). A project filed after that date is reviewed under the amended text.

Frequently asked questions

How big can an ADU be in New York City?

Up to 800 square feet, and one ADU per one- or two-family building, under City of Yes for Housing Opportunity. Some locations, such as areas with flood risk, restrict certain types.

Do I need a permit to build an ADU in NYC?

Yes. Zoning now allows the unit, but the work still needs Department of Buildings approval and must meet the Building Code before anyone lives there.

Did City of Yes ban parking in new buildings?

No. It removed the requirement to build parking in Zone 1 and reduced it in Zone 2. An owner can still choose to provide parking.

Sources

City of Yes for Housing Opportunity, NYC Department of City Planning
City of Yes for Housing Opportunity: final plan, NYC Department of City Planning
City of Yes for Housing Opportunity: Accessory Dwelling Units guide, NYC Department of City Planning
City of Yes for Housing Opportunity: applicability map, Manhattan Community District 12, NYC Department of City Planning
City Council Approves City of Yes with Modifications (December 6, 2024), New York Housing Conference
NYC Council passes City of Yes for Housing Opportunity (January 16, 2025), Nixon Peabody LLP
NYC Zoning Updates: ‘City of Yes’ Reshapes Housing Development Rules (January 27, 2025), Greenberg Traurig LLP
N.Y. Multiple Dwelling Law § 4, Definitions, New York State Senate

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