Remodel Financing Calculator

The financing decision is often more consequential than the contractor decision. A great project financed poorly can cost tens of thousands more over the life of the loan than the same project financed intelligently. In California specifically, homeowners with substantial home equity have access to financing options that do not exist in lower-cost states — and ADU projects unlock programs designed to accelerate the ADU build-out statewide.

HELOCs are the default recommendation for phased remodels because they let you draw funds as contractor invoices arrive instead of carrying interest on money you have not yet spent. Interest is variable, but during the 10-year draw period most lenders allow interest-only payments, which keeps monthly outflow low during construction.

Home equity loans swap the flexibility of a HELOC for the predictability of a fixed rate and fixed payment. Best for projects with a known total cost where you plan to spend the full amount at once.

Cash-out refinances offer the lowest rate but reset your mortgage clock and are only advisable if your current mortgage rate is at or above market refinance rates. If you locked in a rate below 5%, do not touch it with a cash-out refi.

Construction-to-permanent loans are purpose-built for ground-up ADU and large addition projects. They handle the contractor draw schedule and convert to a permanent mortgage at the end of construction. Single close, single set of closing costs.

FHA 203k loans are underused in Orange County. Because they allow lower down payments and bundle renovation cost into the purchase or refinance, they are an excellent option for owner-occupied homes with limited equity. The trade-off is that the scope of work must be approved by an FHA consultant and contractors must be FHA-approved.

CalHFA ADU financing is California-specific. The program periodically offers grants of up to $40,000 for ADU pre-development costs plus access to subsidized construction financing. Grants are first-come, first-served when the program window opens. Combined with an ADU that is cash-flow positive from rent, CalHFA financing can make ADU projects effectively pay for themselves.