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1,593 of 4,948 properties in Castle Hill are eligible for an accessory dwelling unit. 32.2% eligibility rate based on real NYC property data.
4,948
Total Properties
1,593
ADU Eligible
32.2%
Eligibility Rate
R5 / R4A
Top Zones
2,842 ft²
Avg Lot Size
$1K–$2K
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.
32.2% of Castle Hill properties qualify
Based on property data, here are the ADU types that Castle Hill 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 Castle Hill.
$100,000 – $250,000
Est. Construction Cost
$1,400 – $2,000/mo
Est. Monthly Rent
$20,400/yr
Est. Annual Income
Estimates are based on aggregate data from eligible properties in Castle Hill. 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 Castle Hill homeowners. Must be owner-occupied, below 165% AMI, and commit to a 10-year rental period.
Based on our analysis of 4,948 properties in Castle Hill, The Bronx, 1,593 are eligible for an ADU under NYC Local Laws 126 & 127. That is a 32.2% eligibility rate. The most common zoning districts are R5, R4A, R3-2.
Properties in Castle Hill are eligible for Detached Backyard ADU, Basement/Interior Conversion, Attached ADU. The best option depends on your lot size (average in Castle Hill is 2,842 sq ft), existing structures, and budget. Use our eligibility checker for a personalized assessment.
Based on eligible properties in Castle Hill, estimated ADU construction costs range from $100,000 to $250,000. 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 Castle Hill, The Bronx can generate an estimated $1,400 to $2,000 per month in rental income. At $1,700 per month, that is approximately $20,400 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 Castle Hill 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 Castle Hill.
Westchester Square
The Bronx
1,678
Properties
283
Eligible
16.9%
Rate
Schuylerville
The Bronx
1,822
Properties
334
Eligible
18.3%
Rate
Morris Park
The Bronx
6,343
Properties
2,048
Eligible
32.3%
Rate
Throgs Neck
The Bronx
2,908
Properties
1,133
Eligible
39%
Rate
College Point
Queens
4,479
Properties
1,003
Eligible
22.4%
Rate
Pelham Gardens
The Bronx
1,790
Properties
798
Eligible
44.6%
Rate
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