California ADU Grant Program: How to Qualify for Up to $40,000
Quick Answer: The CalHFA ADU Grant Program provides up to $40,000 to income-eligible California homeowners to cover pre-development costs — design, permits, and site prep — before construction begins. The grant does not need to be repaid. DevCo is an approved contractor for the CalHFA program, which is required for your project to qualify.
$40,000 is real money. It's the difference between an ADU project that pencils out and one that doesn't. And for a lot of Bay Area homeowners, it's the piece that makes a garage conversion or junior ADU financially straightforward without tapping equity or taking out a loan.
Here's who qualifies, what the money covers, and how the process works.
What Is the CalHFA ADU Grant Program?
The California Housing Finance Agency (CalHFA) runs the ADU Grant Program to help lower- and moderate-income homeowners offset the upfront costs of building an ADU. The program recognizes that pre-development expenses — design, engineering, permits, and site prep — often run $15,000 to $40,000 before a single nail goes in, which is a barrier to getting started.
The grant covers those pre-development costs dollar-for-dollar up to $40,000. It's structured as a forgivable loan: if you complete the ADU using an approved contractor, it converts to a grant and doesn't need to be repaid.
Who Qualifies for the ADU Grant
Income Limits
Income eligibility is based on Area Median Income (AMI) for your county. For Contra Costa and Alameda counties, the income limits are higher than most of the state due to Bay Area AMI calculations. The program targets homeowners at 80% to 150% AMI — which covers a wide range of middle-income Bay Area homeowners.
Check the CalHFA website for current income limits, as they update annually. A family of four in Contra Costa County may qualify at incomes up to $150,000 to $175,000 depending on the year.
Property Requirements
The property must be a single-family home and your primary residence. The ADU must be intended as a long-term rental (not short-term/vacation rental). The property must be in California.
Contractor Requirement
This is the critical one: you must use an approved CalHFA ADU contractor. DevCo is an approved contractor in the CalHFA program. If you use a contractor that isn't on the approved list, your grant won't be processed — regardless of how the rest of the application looks.
What the Grant Covers
The CalHFA ADU Grant specifically covers pre-development and non-recurring closing costs:
- Architectural and design fees
- Engineering and structural drawings
- Permit fees and application costs
- Site preparation and survey costs
- Third-party reports required for permitting (soil tests, environmental assessments)
It does not cover construction costs directly. The grant is specifically designed to remove the pre-construction financial barrier — getting you through design and permits without coming out of pocket.
How to Apply for the CalHFA ADU Grant
The application process goes through an approved lender, not directly through CalHFA. Here's how it works step by step:
- Step 1: Contact DevCo to confirm your project is eligible and review the scope
- Step 2: Identify a CalHFA-approved lender to process your grant application
- Step 3: Submit your income documentation, property information, and project plan
- Step 4: Receive grant approval and begin pre-development work with DevCo
- Step 5: Complete the ADU — the loan converts to a grant, no repayment required
The timeline from application to approval varies. Having your documentation ready — recent tax returns, proof of ownership, project scope letter from your contractor — speeds things up significantly.
How DevCo Helps You Through the Grant Process
As an approved CalHFA contractor, we've helped homeowners navigate this process multiple times. We know what lenders need to see, what documentation gets applications approved cleanly, and where things typically stall.
When you reach out to us about an ADU project, we'll tell you upfront whether the CalHFA grant looks like a fit for your situation. If it does, we'll handle the project documentation side of your application. The income and financial qualification piece goes through the lender — but we take the project paperwork off your plate.
Is the ADU Grant Still Available?
As of 2025, the CalHFA ADU Grant Program is active. Funding is limited and allocated on a first-come, first-served basis. The program has been refunded multiple times since its launch, but availability isn't guaranteed indefinitely. If this is on your radar, it's worth checking current availability sooner rather than later.
Frequently Asked Questions
Q: How do I qualify for the California ADU grant program?
You need to be the owner-occupant of a single-family home in California, meet the income limits for your county (based on AMI), plan to build an ADU for long-term rental, and use an approved CalHFA contractor. DevCo is on the approved list. Contact us to walk through eligibility.
Q: Does the CalHFA ADU grant need to be paid back?
No, if you complete the ADU using an approved contractor. The program is structured as a forgivable loan — it converts to a grant upon project completion. If you don't complete the ADU or use a non-approved contractor, repayment terms apply.
Q: Can I use the grant on a garage conversion ADU?
Yes. The CalHFA ADU Grant applies to any permitted ADU type — detached, attached, garage conversion, or JADU — as long as the other eligibility requirements are met.
Q: How long does CalHFA ADU grant approval take?
Approval timelines depend on the lender processing your application and current program volume. A well-prepared application with complete documentation typically moves through in 4 to 8 weeks. Incomplete applications — missing tax documents, unclear project scopes — take longer.
Q: What if I don't qualify for the CalHFA grant?
Other financing options include HELOC, cash-out refinance, construction-to-permanent loans, and ADU-specific loan products from lenders like RenoFi. Some counties also have local ADU loan programs. The cost guide covers financing options in more detail.
About DevCo
DevCo builds ADUs across the East Bay — Contra Costa, Alameda, and surrounding counties. We handle design, permits, and construction under one roof, and we're an approved contractor for the CalHFA ADU Grant Program. If you're thinking about building an ADU, start with a conversation.