Typical ADU sizes range from 300–1,200 sq ft. Final allowable size depends on city rules,
lot constraints, and ADU type.
Build Method
Site-Built (Traditional)
Prefab / Modular
Container ADU
Finish Level
Add-ons
See Your Results
Estimated ADU Cost Range
$ —
$ — / sf
Add-ons: $0
Estimated Monthly Payment
Option 1: Cash-out Refinance (ADU portion)
$ —
Option 2: HELOC (Interest-only estimate)
$ —
*Estimates only. Rates/terms depend on lender and borrower profile.
Estimated Rental Income
$ —
Monthly ROI
—%
Next Step
link for California ADU grant https://www.calhfa.ca.gov/adu/ You may qualify for up to $40,000 in California ADU
grant assistance (design / permit soft costs), depending on eligibility.
Pricing shown is an estimated range based on typical construction conditions and assumptions.
Final pricing may vary depending on site conditions, utility upgrades, city and county fees,
engineering requirements, material selections, and permitting authority requirements.
This estimate is not a binding contract or final quote.
Loan / Monthly Payment Calculator
Estimated Monthly
$0
Total Paid
$0
Total Interest
$0
Estimates only. Payments vary based on credit, lender terms, taxes, insurance, and final loan structure.
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