Loading...
Loading...
~21,000 eligible properties in Brooklyn. Brooklyn has the highest ADU rental potential in the outer boroughs, with strong demand from young professionals and families priced out of Manhattan.
~175,000
1-2 Family Homes
~21,000
Eligible Properties
R4 / R5
Top Zones
2,000–2,500 sq ft
Avg Lot Size
$2,200–$3,000/mo
Est. ADU Rent
$930K
Median Home Value
Under NYC Local Laws 126 & 127 (City of Yes for Housing Opportunity), homeowners in eligible zoning districts can build ADUs on their property.
The right ADU type depends on your lot, existing structures, and budget. Here are the most common options for Brooklyn homeowners.
Brooklyn's attached rowhouses and semi-detached homes often have full basements with high ceilings — ideal for conversion. This is the most cost-effective option in the borough.
Lots in southern Brooklyn neighborhoods like Marine Park and Canarsie tend to have deeper yards that can accommodate a detached ADU, even on 2,000+ sq ft lots.
Many Brooklyn homes feature detached garages on rear alleys. Converting an existing garage avoids new-construction costs and is eligible under Local Laws 126 & 127.
Construction costs vary by ADU type, size, site conditions, and finishes. These ranges reflect typical Brooklyn projects.
| ADU Type | Estimated Cost | Timeline |
|---|---|---|
| Basement Conversion | $120,000–$250,000 | 3–6 months |
| Garage Conversion | $170,000–$300,000 | 4–7 months |
| Detached Backyard ADU | $250,000–$500,000 | 6–12 months |
Estimates include design, permitting, construction, and utility connections. Using HPD pre-approved plans can save $15,000–$40,000 on design costs.
ADUs can generate significant monthly income to offset your mortgage, property taxes, and construction costs.
$2,200–$3,000/mo
Estimated Monthly Rent
$930K
Median Home Value
20–30%
Typical Property Value Increase
These Brooklyn neighborhoods have the highest concentration of eligible 1-2 family homes in ADU-friendly zoning districts.
East Flatbush
Canarsie
Flatlands
Bay Ridge
Marine Park
Sheepshead Bay
Midwood
Bergen Beach
NYC offers grants and low-interest loans to help homeowners fund ADU construction.
Up to $395,000 in combined loans and grants (including up to $175,000 as a grant) for eligible Brooklyn homeowners. Must be owner-occupied, below 165% AMI, and commit to a 10-year rental period.
Most 1-2 family homes in Brooklyn's R4 and R5 zoning districts are eligible under Local Laws 126 & 127. The property must be owner-occupied and meet lot size, setback, and FAR requirements. Use our eligibility checker with your address for an instant assessment.
Basement conversions in Brooklyn typically cost $120,000–$250,000. Garage conversions run $170,000–$300,000. New detached backyard ADUs range from $250,000–$500,000 depending on size and finishes. Brooklyn's higher labor and material costs push estimates above some other boroughs.
A 1-bedroom ADU in Brooklyn typically rents for $2,200–$3,000/month depending on neighborhood, finishes, and size. At $2,500/month, that's $30,000/year in gross rental income — enough to pay back a $200K build in under 7 years while also increasing your property value.
Yes. The Plus One ADU Program offers up to $395,000 in combined loans and grants (including up to $175,000 as a grant) for eligible homeowners across all five boroughs. You must be owner-occupied, below 165% AMI, and commit to a 10-year rental period. Applications are open until June 12, 2026.
Dive deeper into ADU eligibility, costs, and rental potential for specific Brooklyn neighborhoods.
Check if your Brooklyn property qualifies in under 2 minutes, or explore pre-approved ADU plans that fit your lot.