How to Finance an ADU in California
Updated June 12, 2026 · Upside ADU
Quick answer
The most common ways to finance an ADU in California in 2026 are a HELOC or home-equity loan, a cash-out refinance, a renovation loan (Fannie Mae HomeStyle / RenoFi), and construction-to-permanent loans. The CalHFA $40,000 ADU Grant is no longer accepting applications — its funds are exhausted, so plan around the loan options instead.
Is the CalHFA $40,000 ADU grant still available?
No — and this matters because many builder and lender websites still advertise the CalHFA $40,000 ADU Grant as if it's available. CalHFA's own program page confirms the funds are depleted and it is not accepting new reservations as of 2026. Anyone telling you to count on that grant in your budget is working from stale information. Plan your financing around the loan options below.
What are your ADU financing options in 2026?
There's no single 'ADU loan.' Instead, homeowners combine one or two of the products below based on how much equity they have and how the lender values the finished unit. The right choice usually comes down to one question: do you have enough existing equity, or do you need a loan that underwrites against the home's value after the ADU is built?
- HELOC / home-equity loan: borrow against existing equity with a flexible draw period
- Cash-out refinance: replace your mortgage and pull equity for the build
- Renovation loan (RenoFi, Fannie Mae HomeStyle): underwrites against after-completion value
- Construction-to-permanent loan: funds the build in draws, then converts to a mortgage
- Some programs let you count projected ADU rent toward qualifying income
How do the ADU loan types compare?
Each product trades off rate, flexibility, and how much it can lend. The table summarizes the practical differences. Rates shown are illustrative 2026 ranges and move with the market — get current quotes before deciding.
ADU financing options compared (illustrative 2026 ranges)
| Option | Borrows against | Typical rate | Best when |
|---|---|---|---|
| HELOC | Existing equity | Variable, ~8–10% | You have strong equity and want flexible draws |
| Home-equity loan | Existing equity | Fixed, ~7.5–9% | You want a fixed payment on a lump sum |
| Cash-out refinance | Existing equity | ~6.5–7.5% | Your current mortgage rate is high |
| Renovation loan | After-completion value | ~7–8% | Current equity is thin |
| Construction-to-perm | After-completion value | ~7.5–8.5% | You want one loan for build + mortgage |
How much can you borrow for an ADU?
How much you can borrow depends on which value the lender underwrites. Equity products — HELOC, home-equity loan, cash-out refinance — are limited by your current home value, and most lenders let you reach a combined loan-to-value of roughly 80–90%. Renovation and construction-to-permanent loans underwrite against the home's after-completion value, which already includes the finished ADU, so they can lend more when current equity is thin. That single difference — current value versus after-completion value — usually decides which product can actually cover your build.
See also:ADU rental income & ROI in Sacramento — whether the payment pencils out
HELOC vs. construction loan: which should you pick?
If you already hold significant equity, a HELOC or cash-out refinance is usually the simplest and cheapest route — you're borrowing against value you already have. If your equity is thin, a renovation or construction-to-permanent loan is the answer because it underwrites against what the home will be worth once the ADU exists, not just its current value. That after-completion underwriting is the single most useful concept in ADU financing.
How does the loan payment compare to rent?
The core ADU financing case is that the unit can help pay for itself. On a $250,000 ADU financed over 30 years near 7.5% APR, the payment is roughly $1,750/month — often below the rent the unit can earn across much of the Sacramento region. That gap is what makes the build cash-flow positive over time, but the detailed rent-versus-payment math belongs in the ROI guide.
See also:ADU rental income & ROI in Sacramento — the full payback math
Can projected ADU rent help you qualify?
Some renovation and construction-loan programs let you count a share of the projected ADU rent toward your qualifying income, which can meaningfully expand how much you can borrow. Underwriting rules vary by lender and program, and they typically require a market-rent appraisal. This is education, not an application — when you're ready to apply, the financing page covers Upside's lender process.
See also:Finance your Upside ADU — lender process and how to apply
What financing mistakes should you avoid?
- Budgeting around the CalHFA grant — it's exhausted and not accepting applications
- Assuming you can't build because current equity is low (renovation loans solve this)
- Ignoring closing costs and draw-schedule timing on construction loans
- Forgetting that an ADU raises property tax on the added value — factor it into cash flow
- Locking a rate without comparing a refinance to a second-position HELOC
See also:Does an ADU increase property tax?
This guide is general information, not legal or tax advice. ADU rules change often and vary by city — we confirm the current requirements for your jurisdiction during your free feasibility check.
Sources & references
- ADU Grant Program status — California Housing Finance Agency (CalHFA)
- HomeStyle Renovation mortgage — Fannie Mae
- Accessory Dwelling Units — official guidance — California Dept. of Housing & Community Development (HCD)
External links open official government and lender resources. Construction price and rent figures reflect 2026 Sacramento-region market conditions; confirm current rules and fees with your jurisdiction.