Cost & Financing Guide

Your Guide to ADU Costs & Financing in California

Estimate Your Build Cost
ADU Type*
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Square Feet*
400 Sq. ft.
1200 Sq. ft.
$280,000 to $350,000
ADU Cost Calculator
600 Sq. ft.
400 Sq. ft. 1200 Sq. ft.
$310,000 to $390,000
Disclaimer: This is a preliminary estimate for planning purposes only. Site conditions, city fees, and material choices will affect the final cost. For a detailed, fixed-price quote, book a free consultation.

 How to Fund Your ADU Investment

Home Equity Line of Credit (HELOC)

Use the existing equity in your home to open a revolving line of credit. This is a popular and flexible option for funding your ADU construction. We can connect you with lenders who specialize in home equity lines of credit (HELOCs) for ADU projects, offering competitive rates and terms tailored to homeowners.

Renovation Loan (FHA 203k)

This type of loan bundles the cost of the ADU construction into your primary mortgage, making it a great option if you have less equity. It's based on the future appraised value of your home with the ADU included, allowing you to borrow against the increased worth of your property.

Cash-Out Refinance

Refinance your current mortgage for a higher amount and use the difference (‘cash out’) to pay for your ADU project. This can be a good choice if you can also secure a lower interest rate, helping you reduce monthly payments while unlocking funds for construction.