ADU Financing · 2026
ADU Loans in California: Your Financing Options (2026)
There is no single “ADU loan” in California. Instead, homeowners fund a backyard home using one of several loan types, most commonly a HELOC, a cash-out refinance, a construction-to-permanent loan, a renovation loan, or a newer ADU-specific product. Each one borrows against either your existing home equity or the future value the ADU will add, and the right choice depends on how much equity you have and how predictable you want your payments to be.
The short version: Most California ADU loans fall into five buckets: HELOC, cash-out refinance, construction-to-permanent, renovation loan, and ADU-specific financing. If you have equity today, a HELOC or cash-out refi is usually simplest. If you are short on equity, a renovation or ADU-specific loan can lend against the home’s future value. Framework First does not lend, but our family team can introduce you to ADU-focused partners.
How ADU loans actually work
Almost every ADU loan is really a way to tap one of two values: the equity you already have in your home, or the higher value your property will have once the ADU is finished. Lenders who only count today’s value (HELOCs, cash-out refis) need you to already have meaningful equity. Lenders who count the future, “as-completed” value (construction and renovation loans) can work even if you are equity-light, because they are betting on what the property will be worth after the build.
That single distinction explains most of the differences below.
The five main ADU loan types
| Loan type | Borrows against | Best when | Trade-off |
|---|---|---|---|
| HELOC | Current home equity | You have equity and want flexibility | Variable rate; payment can move |
| Cash-out refinance | Current home equity | Today’s rates beat your existing mortgage | Replaces your whole mortgage |
| Construction-to-permanent | Future (as-completed) value | You want one rate and one closing | More paperwork; draw schedule |
| Renovation loan | Future (as-completed) value | You are short on equity today | Stricter appraisal and oversight |
| ADU-specific loan | Future ADU value | You want a product built for ADUs | Fewer lenders offer them |
1. HELOC (home equity line of credit)
A HELOC is a revolving line you draw from as the project needs cash, much like a credit card secured by your house. Many homeowners pay interest-only during construction, which keeps early payments low, then repay the balance over time. It is the most common and most flexible route when you already have equity. The main trade-off is the variable rate, so your payment can rise or fall with the market.
2. Cash-out refinance
You refinance your existing mortgage for more than you currently owe and take the difference in cash to fund the ADU. This bundles everything into one loan and one payment. It shines when current rates are at or below your existing mortgage rate. If you locked a low rate years ago, refinancing your whole balance just to fund an ADU usually costs more than it is worth, and a HELOC is the better fit.
3. Construction-to-permanent loan
A single loan covers the build and then converts into a normal long-term mortgage once the home is complete, so you only close once. Funds release in stages (called draws) as the project hits milestones. Because the lender underwrites the as-completed value, this can work even when you do not have huge equity today. Expect more documentation and a draw schedule in exchange for locking your terms up front.
4. Renovation loan
Renovation loans (you may hear of FHA 203(k) or Fannie Mae HomeStyle, among others) let you borrow against what the property will be worth after the work is done, not just its current value. That makes them a strong option for equity-light homeowners. The trade-off is tighter oversight: a more involved appraisal, contractor approvals, and inspections along the way.
5. ADU-specific loans
A growing number of lenders now offer products designed specifically for accessory dwelling units, often underwriting the rental income or added value the ADU is expected to create. These can stretch your borrowing power further than a traditional equity loan, but fewer lenders offer them, so they take a bit more searching. An ADU-focused lending partner can tell you quickly whether you qualify.
Which loan fits which situation?
A simple way to narrow it down:
- Lots of equity, want flexibility? HELOC.
- Lots of equity, and rates have dropped? Cash-out refinance.
- Want one locked rate and one closing? Construction-to-permanent.
- Short on equity but the ADU will add a lot of value? Renovation or ADU-specific loan.
For a fuller walk-through of how most homeowners actually pull the trigger, see our companion guide on how to finance an ADU in California. And if you are starting from little or no equity, read how to finance an ADU without cash.
Why a fixed ADU price makes financing easier
The hardest part of financing a custom build is usually the moving target: open-ended change orders that balloon the loan you need. Framework First ADUs range from $199,000 to $599,000 across our 14 models (from a 405 square-foot one-bedroom up to a 1,200 square-foot three-bedroom home), and that price includes a permitting budget, the factory build, crane delivery, appliances, and inspections before you ever talk to a lender. Exact permit costs are set by your city and confirmed in your feasibility study.
A known, fixed number means your lender knows exactly how much to lend, and you are not scrambling to fund surprises mid-build. You can see every model and its price on our models page or run any one of them through the ROI calculator to compare the monthly loan payment against the rent it could earn. For many homeowners, the rent more than covers the payment.
ADU loans in California: quick answers
Is there a special “ADU loan” in California?
Not a single standard one, though ADU-specific products are growing. Most homeowners use a HELOC, cash-out refinance, construction-to-permanent, or renovation loan. A handful of lenders now offer dedicated ADU loans that underwrite the future value or rental income of the unit.
Do I need a down payment for an ADU loan?
Usually not in the way you would for buying a new property. With equity-based loans, the equity you have already built acts as your stake. Construction and renovation loans lend against the home’s future value, which can reduce or eliminate a separate cash down payment. Confirm specifics with a lender.
Can I get an ADU loan with little home equity?
Often yes, through a renovation or ADU-specific loan that underwrites the as-completed value rather than today’s equity. These products exist precisely for homeowners who are equity-light but whose ADU will meaningfully raise the property’s value.
Does Framework First provide ADU financing?
No. Framework First does not lend directly. We are a family-owned builder, and we refer financing to ADU-focused lending partners who handle HELOCs, construction loans, refinances, and renovation loans for California homeowners. You are always free to use your own lender.
Does the ADU’s rental income help me qualify?
Frequently, yes. Many lenders, especially those offering ADU-specific products, will count projected rent toward your ability to repay. The exact treatment varies by lender, so ask early and bring a realistic rent estimate. Our guide on ADU rental income in California can help you build that estimate.
We don’t lend, but we’ll connect you
Framework First builds roughly 97% of each home in our own Salinas factory, then crane-delivers and finishes it on your lot, typically in 4 to 9 months. We are licensed (CSLB #1047146 and MFG #1595931) and family-owned since 2021, serving homeowners across Monterey, Santa Cruz, San Benito, and Santa Clara counties, with San Luis Obispo handled case by case.
When it comes to the loan itself, we keep it simple: once you know which model fits your lot, our team can introduce you to an ADU-focused lender who matches your situation to the right loan type. There is no obligation, and the introduction is free. For the bigger picture on how it all comes together, our financing overview lays out partners and next steps.
The right loan depends on what your lot can actually host, so start there. Start with a feasibility study and we will confirm what you can build, what it will cost all-in, and which financing path fits before you ever apply.