CalHFA ADU Grant Program
California Housing Finance Agency
About This Program
Grant to help income-eligible homeowners build accessory dwelling units (ADUs) on their property. Requires agreement to rent the ADU at affordable rates for at least 5 years. Check CalHFA website for future funding rounds.
Grant toward ADU construction with 5-year affordable rent requirement
Record set last reviewed 2026-06-09. How we verify our data.
Other published resources for Castro Valley, CA, are listed below. Review each separately and ask the administrators whether they can coordinate funding for the same work:
- FEMA Hazard Mitigation Grant Program (HMGP) Varies, no individual cap; projects typically $10K-$200K+
- FEMA Increased Cost of Compliance (ICC) Coverage Up to $30,000
- HUD Lead Hazard Control & Healthy Homes Varies by jurisdiction, typically $5,000-$15,000 per unit
- EPA / WIIN Act Lead Service Line Replacement Varies, full line replacement cost covered in many programs
Key Details
- Grant up to $40,000 for ADU construction
- Income limits: typically at or below 80% AMI
- Must rent ADU at affordable rates for 5 years
- Program currently closed, check for reopening
- Helps create affordable housing supply
How to Apply
Confirm the current application route with the administrator. Verified official forms and steps appear below when available.
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Some programs for this project type ask for a license, inspection, or written estimate. Confirm the rule before contacting a contractor in Castro Valley.
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Deadline: Program closed; check for future rounds
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Find More Programs in Castro Valley, CA
This is one of several kinds of assistance that may be available. Review other programs separately and confirm whether their administrators allow coordination for the same work.
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