Mamdani to further streamline ADU building and permitting

New York will make it easier for homeowners to build accessory dwelling units, also known as granny flats, on properties with one-family or two-family homes. The Landmarks Preservation Commission will release an online map showing where ADUs can be built in historic districts. The Department of Buildings will streamline permitting for certain manufactured homes. The changes are part of a broader housing plan that includes investments aimed at increasing housing production and preservation while protecting tenants and homeowners. The city previously launched a homeowner website with pre-approved plans and a guidebook, and it participates in the Plus One ADU program offering up to $395,000 in support. Backyard ADUs remain prohibited in historic districts, while other ADU types are allowed.

"The city will provide new technical and financial support to homeowners who want to build accessory dwelling units ADUs on their properties, Mayor Zohran Mamdani is set to announce Tuesday. ADUs, or so-called granny flats, are independent residences on the same lot as one-family or two-family homes, and depending on location are also called in-law suites, backyard cottages or basement apartments."

"The Landmarks Preservation Commission will release an online map that identifies where ADUs can be built in historic districts. The Department of Buildings will also streamline permitting for certain manufactured homes. The changes are part of the mayor's housing plan, set to be released Tuesday."

"We are setting the most ambitious housing production and preservation targets in the city's modern history and backing them up with investments to match while also protecting tenants and homeowners, investing in public housing and ensuring the workers building that housing have good-paying, safe jobs, said Mayor Mamdani in a statement."

"Backyard ADUs are prohibited in historic districts, but other types of ADUs are allowed, including converted cellars, attics, and garages. The Landmarks Preservation Commission will create an online map of potential ADU locations, create a dedicated team to help property owners and consider rules to make the review process easier, according to the housing plan."

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