Plus One ADU Program
What is the Plus One ADU Program?
The Plus One ADU program is a New York State grant that is available to support homeowners of modest means to build or renovate ADUs. This program provides up to $125,000 in soft and hard costs per home to create or legalize ADUs/accessory apartments in Tarrytown, Lewisboro, and Pleasantville, with 10% of the grant award dedicated towards HAC delivery/administrative fees. The program is aimed to support low- and middle-income single-family homeowners who wish to build a new ADU on their property or improve an existing ADU.
What can a Plus One ADU Grant be used for?
- Basement, attic, or other interior apartments
- Garage conversions
- Small stand-alone units on a single-family lot
- Homeowners who need to legalize or bring up to code an existing ADU may also apply

How do I qualify for the program?
- Your household income (gross income, pre-tax) must not exceed 120% of the area median income (AMI), as listed in the chart below:
Maximum Annual Gross Household Income Limits
| 1 person | 2 person | 3 person | 4 person | 5 person | 6 person | 7 person | 8 person |
| $142,800 | $163,200 | $183,600 | $204,000 | $220,300 | $236,650 | $252,950 | $269,300 |
*Household members include all the current persons residing in the home and their incomes, regardless of familial relationship
- You must demonstrate that you would only be able to finance the development of the proposed ADU if you’re awarded a Plus One ADU grant.
- You must be able to demonstrate that you own and occupy the residence where the ADU will be located, and that it is your primary residence.
- Your proposed ADU must be permissible under local zoning.
- You must have homeowner’s insurance.
- You must be a US citizen or have legal resident status.
- If your project cost exceeds the $125,000 Plus One ADU Grant, you will need to be able to secure additional funding or financing options.
Eligible single-family homes and property must be:
- Located in Tarrytown, Lewisboro, and Pleasantville where ADU/Accessory Apartments are permitted.
- Property must not have any zoning code violations.
- Property must be big enough to meet all building setback requirements for ADUs/Accessory Apartments.
- Property must not have other residential buildings or commercial businesses operating on the property.
- Not located in a flood zone or flood paths. Homes in Special Flood Hazard Areas will require flood insurance. Satisfactory flood elevation certifications may be required at the owner’s expense.
Now Accepting Applications Until March 1
Application Submissions: Applications and documentation required must be either emailed, mailed, or hand delivered to the following address:
Housing Action Council
55 S Broadway, Tarrytown, NY 10591
Email: shoffman@affordablehomes.org
All applications, including supporting materials, must be received on or before March 1st. The timeliness of your application is a factor in the review process, and no exceptions will be made for late submissions.
Apply for Your Town’s ADU Grant Here
Lewisboro ADU Term Sheet Application
Pleasantville ADU Term Sheet Application
Tarrytown ADU Term Sheet Application
FAQs
What costs are covered by the grant?
Hard costs and soft costs are associated with the creation or legalization of an ADU, accessory apartment, or cottage. These costs include the ADU design and permitting, project budgeting, environmental site review, contractor selection & scoping, construction oversight, landlord training, and post construction monitoring. Other costs included are technical assistance fees, land survey, permits, and payments to architects/other vendors. There is a maximum subsidy available to each approved program participant of $125,000, with up to 10% of the grant award ($12,500) being dedicated towards HAC delivery/administrative fees. Any costs over and above are the sole responsibility of the homeowner.
Who can I rent the unit to? Are there any income restrictions on tenants?
The ADU/accessory apartment can be used by aging parents, older children, live-in caregivers and visitors, or be used as rental property (short term or vacation rentals are not permitted). There are no income restrictions on the tenant. There are only restrictions on use. Each ADU must be occupied as a primary residence for the term of the program compliance period, which is 10 years from completion and sign off.
Are there any regulatory agreements and for how long?
Homeowners are required to enter into a regulatory agreement with HAC for 10 years. Compliance monitoring will also be required. This will include certifications that the ADU is being used as permanent housing, rather than short-term rental, and site visits every two years to ensure appropriate property maintenance and quality housing standards. Homeowners (awardees) must deliver any compliance documentation required under this program, as well as any municipal requirements.
For More Information Please Contact:
Housing Action Council, shoffman@affordablehomes.org