about-accessory-dwelling-units

Housing Preservation & Development


About Accessory Dwelling Units (ADUs)


An Accessory Dwelling Unit (ADU) is a small, independent residential dwelling unit located on the same lot as your home. The unit could be located within the existing home or could be a fully independent and detached structure. ADUs come in a variety of types, including basement apartments, attic conversions, or in-law suites.

ADUs can serve a number of different purposes providing housing to family members or serving as an added source of income for household expenses by renting an additional unit.

Depending on your lot, you may be able to develop one of the following ADU typologies:

Attached accessory structures (ex. Attached garages)

Detached existing structures or newly constructed structures

Basement or attic unit conversions

Tools & Resources

We are in the process of developing resources for New Yorkers, which will be available soon. Thank you for your patience!

Financing Options

The City offers a financing program for eligible homeowners through the Plus One ADU Program. For more information about this program and to see if you meet the eligibility criteria, please visit Plus One Accessory Dwelling Unit (ADU) Program webpage or email the program at PlusOneADU@hpd.nyc.gov

Inquiries

Homeowners interested in learning more about how to develop ADUs on their own may complete the survey linked below to receive information from the team once that information is available.

ADU General Interest Form

For general inquiries, please contact us at ADUResources@hpd.nyc.gov and describe what you need assistance with so that our team can respond with the appropriate information to assist you.