What Loan Options Exist for Building an ADU If You Don't Have Cash Savings?

Updated September 2026

If you don't have cash savings, you can still finance an ADU through a HELOC or cash-out refinance against your home's equity, a dedicated ADU construction loan, or a renovation loan like an FHA 203(k) for an attached unit — the CalHFA $40,000 ADU grant that used to help with pre-development costs has been closed to new applications since 2023. Each option trades off differently on down payment, interest rate, and how much home equity you need going in, so the right one depends on your current mortgage, your credit, and how much of your own money you want tied up in the project.

What Financing Options Are Available If You Don't Have Cash Savings for an ADU?

The main paths are a home equity line of credit (HELOC), a cash-out refinance, a dedicated ADU construction loan, an FHA 203(k) renovation loan for an attached unit, or a personal loan for smaller projects. Most of these let you build without touching your own savings because they're secured by your home's equity or structured as purpose-built construction financing — the tradeoff is that most require some equity already in the property, typically leaving 15% to 20% equity remaining after the loan. If you have little or no equity yet, an FHA 203(k) or a credit union renovation product with a low or no-money-down structure is usually the more realistic starting point.

How Does a HELOC or Cash-Out Refinance Work for ADU Financing?

A HELOC lets you draw funds as you need them during construction and pay interest only on what you've drawn, with variable rates that have run around prime plus 0.5 to 2 points and approval in roughly 30 to 45 days — a good fit for projects under about $250,000 built out over 8 to 12 months. A cash-out refinance replaces your existing mortgage with a larger one and gives you the difference as a lump sum, with fixed rates that have run in the 6.5% to 7.5% range and a longer 45- to 60-day timeline; it tends to make more sense for larger builds in the $250,000-plus range or when you also want to consolidate other debt. Both require meaningful equity in the home, since lenders generally want 15% to 20% equity left after the new loan.

What Are ADU-Specific Construction Loans, and How Do They Differ?

An ADU construction loan is built specifically for the project: funds release in stages as construction hits milestones rather than all at once, and many lenders offer a construction-to-permanent structure that converts to a regular mortgage once the unit is finished. Rates have generally run higher than HELOCs or refinances — roughly 8% to 10% — and approval typically takes 60 to 75 days because of the added documentation, but the loan is kept separate from your primary mortgage, which some homeowners prefer. An FHA 203(k) renovation loan is a different route worth knowing about: it can finance up to about 96.5% of the improved property value, which makes it one of the lower-down-payment options, but it generally applies to attached ADUs such as garage conversions rather than detached new construction.

Is the CalHFA ADU Grant Still Available, and What Should You Watch Out For?

The CalHFA ADU Grant Program offered up to $40,000 as a forgivable loan toward pre-development costs like architectural plans, permits, and site work for income-qualified homeowners, but that funding round closed to new applications back in December 2023 and has not reopened. If someone contacts you offering to help you "get" this grant today, treat it as a red flag — CalHFA itself has warned homeowners about scams built around the program's earlier popularity. Without the grant, homeowners with limited equity are generally better served by a credit union renovation loan, an FHA 203(k), or, once some equity has built up, a HELOC or cash-out refinance.

Frequently Asked Questions About Financing an ADU Without Savings

Q: How much does it typically cost to build an ADU in California? Most detached ADUs run somewhere between roughly $135,000 and $255,000 all-in, depending on size, finishes, and site conditions, while attached conversions such as garage ADUs tend to cost less.

Q: Can I finance an ADU with little or no home equity? Yes — an FHA 203(k) renovation loan can finance up to about 96.5% of the improved property value for an attached unit, and some credit unions offer renovation loan products with lower or no equity requirements, though rates and terms vary by lender.

Q: Is the $40,000 CalHFA ADU grant still available? No. That funding round closed to new applications in December 2023 and has not been replaced by a new round as of 2026, so any offer to help you obtain it should be treated with caution.

Q: Which financing option is best if I want the lowest monthly payment during construction? A HELOC is usually the most flexible during the build itself, since you only pay interest on the amount you've actually drawn rather than the full approved line, but it does carry a variable rate that can move with the market.

Sources: current ADU financing guides on HELOC, cash-out refinance, construction loan, and FHA 203(k) terms for California in 2026, and reporting on the status of the CalHFA ADU Grant Program. This is general information, not financial or lending advice — consult a licensed mortgage professional for guidance on your specific situation. Andrea Pazmino-Pace, DRE #02013784.