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Our Plus One ADU application is closed at this time. Please fill out our interest form to be notified when the application opens again!

Thank you for your interest in the Plus One ADU Program. The Plus One ADU application is closed at this time due to an overwhelming interest in the program in the Towns of Babylon, Shelter Island and Southampton. We are placing all new applications on the waitlist as we review applications at this time. Please fill out our interest form to be notified when the application opens again!

Accessory Dwelling Units (ADUs) are secondary housing units on a single-family residential lot. ADUs benefit homeowners, renters, and the community by creating more housing options while maintaining the character of single-family residential suburban and rural communities. For homeowners, a code-compliant ADU can provide an additional source of income, flexibility for multi-generational housing, and an increase in property value.

CDLI has been selected by New York State Homes and Community Renewal to administer the new Plus One ADU Program in the Town of Babylon, Shelter Island, and Southampton. The Plus One ADU Program provides a full-service program to support low- and middle-income single-family homeowner occupants who wish to:

  • Build a new accessory dwelling unit on their property OR

  • Improve an existing ADU that needs to be brought into compliance with code requirements.


Program Highlights

Up to $125,000 in grant funding including project management costs per ADU constructed.

Program support includes ADU design, permitting, and construction costs including oversight and closeout.

Household annual income must be below the current Nassau/Suffolk Area Median Income (AMI) based on family size.[1]

Homeowners and renters must maintain year-round residency and keep the property in good condition and repair for 10 years or until the sale of the property[2]



What documents do I need to apply?

Click here for FAQs

[1] Currently $156,300 for a family of 4.

[2] In the event of the sale of property or non-compliance, the amount of grant funds will be subject to repayment in accordance with a simple annual declining balance, based on the ten-year regulatory period.

Contact Info


(631) 471-1215



We are a nonprofit exempt mortgage banker. Loans are arranged through third-party vendors. CDLI Funding Corporation is a Fair Housing and Equal Opportunity lender.

Take Action

Fill out our interest form today!

Plus One ADU Program

Plus One ADU Program

Grants for homeowners in Babylon, Shelter Island, and Southampton for accessory dwelling unit construction.

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