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2,535 of 8,273 properties in Flatlands are eligible for an accessory dwelling unit. 30.6% eligibility rate based on real NYC property data.
8,273
Total Properties
2,535
ADU Eligible
30.6%
Eligibility Rate
R3-2 / R4
Top Zones
2,362 ft²
Avg Lot Size
$2K–$3K
Est. Monthly Rent
Under NYC Local Laws 126 & 127 (City of Yes for Housing Opportunity), homeowners in eligible zoning districts can add an accessory dwelling unit to their property.
30.6% of Flatlands properties qualify
Based on property data, here are the ADU types that Flatlands homeowners can build.
Construct a standalone cottage in the rear yard. Up to 800 sq ft under NYC rules. Requires sufficient lot area and setbacks.
Convert existing basement or interior space into a self-contained dwelling unit with separate entrance, kitchen, bathroom, and sleeping area.
Build a new ADU attached to the existing home -- such as a side or rear addition. Shares at least one wall with the primary structure.
Estimated costs and rental income based on real data from eligible properties in Flatlands.
$150,000 – $350,000
Est. Construction Cost
$2,200 – $3,000/mo
Est. Monthly Rent
$31,200/yr
Est. Annual Income
Estimates are based on aggregate data from eligible properties in Flatlands. Actual costs vary by ADU type, size, site conditions, and finishes. Using HPD pre-approved plans can save $15,000–$40,000 on design costs.
Up to $395,000 in combined loans and grants (including up to $175,000 as a grant) for eligible Flatlands homeowners. Must be owner-occupied, below 165% AMI, and commit to a 10-year rental period.
Based on our analysis of 8,273 properties in Flatlands, Brooklyn, 2,535 are eligible for an ADU under NYC Local Laws 126 & 127. That is a 30.6% eligibility rate. The most common zoning districts are R3-2, R4, R5.
Properties in Flatlands are eligible for Detached Backyard ADU, Basement/Interior Conversion, Attached ADU. The best option depends on your lot size (average in Flatlands is 2,362 sq ft), existing structures, and budget. Use our eligibility checker for a personalized assessment.
Based on eligible properties in Flatlands, estimated ADU construction costs range from $150,000 to $350,000. Actual costs depend on the ADU type, size, site conditions, and finishes. Using HPD pre-approved plans can save $15,000-$40,000 on design costs.
ADUs in Flatlands, Brooklyn can generate an estimated $2,200 to $3,000 per month in rental income. At $2,600 per month, that is approximately $31,200 per year in gross rental income.
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 in Flatlands and all NYC neighborhoods. You must be owner-occupied, below 165% AMI, and commit to a 10-year rental period. Applications are open until June 12, 2026.
Explore ADU eligibility in areas near Flatlands.
Marine Park
Brooklyn
5,435
Properties
2,180
Eligible
40.1%
Rate
East Flatbush
Brooklyn
9,591
Properties
5,090
Eligible
53.1%
Rate
Midwood
Brooklyn
10,292
Properties
2,773
Eligible
26.9%
Rate
Mill Basin
Brooklyn
1,313
Properties
247
Eligible
18.8%
Rate
Gerritsen Beach
Brooklyn
2,122
Properties
146
Eligible
6.9%
Rate
Sheepshead Bay
Brooklyn
6,204
Properties
1,791
Eligible
28.9%
Rate
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