CalHFA ADU Grant Program

California Housing Finance Agency

Closed Home Repair

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Availability: Closed
Listed amount: Up to $40,000 grant

Review status and administrator source Open Cited Source

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

The cited general URL responded on 2026-09-17; it does not confirm this program or amount.

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 Local lead-service-line replacement assistance varies; contact your water utility

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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Program phone: (877) 922-5432

Some programs require contractor estimates, licenses, or inspections. A cited link may be general, so confirm the current rules with the administrator before hiring; a directory match does not guarantee contractor eligibility or funding.

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Deadline: Program closed; check for future rounds

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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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