ADU Financing Options
California's ADU-friendly legislation (AB 68, AB 881, SB 13) has made Accessory Dwelling Units the state's fastest-growing housing type. Financing options include construction loans for ground-up ADU builds ($150,000-$500,000), home equity loans or HELOCs using existing equity, cash-out refinancing to access equity for construction costs, and FHA 203k or Fannie Mae HomeStyle renovation loans that wrap the ADU construction into a purchase or refinance.
The key financial advantage: once complete, ADU rental income can be used to qualify for the financing. A completed ADU renting for $2,500/month adds $30,000 in annual income that supports the debt service. Some lenders allow projected ADU rental income based on a market rent appraisal even before construction begins, making the financing self-supporting. California ADU permit costs range from $5,000-$15,000 depending on the municipality, and construction costs average $150-$350 per square foot.
Frequently Asked Questions — ADU Financing
What is ADU financing in California?
ADU financing funds an accessory dwelling unit — a granny flat, garage conversion or backyard cottage. California law now requires most cities to permit them. Options include a renovation loan using after-completion value, a HELOC against existing equity, or cash-out refinancing. Some lenders count projected ADU rental income toward qualifying. Expect a 660 minimum credit score and 30-60 days to close.
What credit score do I need for adu financing?
Most ADU financing programs in California look for 660+. Credit tends to affect your pricing more than your eligibility — a stronger score usually shows up as a lower rate rather than a different answer on whether you qualify.
How much down payment do I need?
An ADU financing in California typically requires 10-25% equity position. The exact figure moves with your credit profile, occupancy and property type — stronger files land at the low end of that range.
How long does closing take?
An ADU financing in California generally closes in 30-60 days. Appraisal turn times and how quickly you return requested documents are the two things that move that timeline most.
Can I use this program for an investment property?
An ADU financing is available for primary residence, occasionally investment. Occupancy affects both pricing and down payment, so confirm the intended use up front — it changes the terms you are quoted.
Are rates higher for adu financing?
ADU financing rates run at or close to conventional market rates, since these are agency-eligible loans. Your specific number depends on credit, down payment, occupancy and the day you lock.
Do I need to verify my income?
For an ADU financing, income is full documentation, with the projected ADU rent sometimes counted. This is the main way the program differs from a standard conventional loan, and it is usually the reason borrowers choose it.
Can I refinance later into a different program?
Yes. With an ADU financing the usual path is to roll construction financing into a permanent loan once the unit is finaled. Nothing locks you in — plan the exit when you take the loan rather than after.
What documents do I need to apply?
For an ADU financing you will need a government ID, credit authorization and property details, plus approved ADU plans, a contractor bid and city permit documentation.
How do I get started?
Call (888) 703-1840 for a free ADU financing consultation, or use the form on this page. Pre-approval usually takes 1-3 business days, and there is no cost and no hard credit pull to find out what you qualify for.
Related Loan Programs
What is ADU financing in California?
ADU financing funds an accessory dwelling unit — a granny flat, garage conversion or backyard cottage. California law now requires most cities to permit them. Options include a renovation loan using after-completion value, a HELOC against existing equity, or cash-out refinancing. Some lenders count projected ADU rental income toward qualifying. Expect a 660 minimum credit score and 30-60 days to close.
What credit score do I need for adu financing?
Most ADU financing programs in California look for 660+. Credit tends to affect your pricing more than your eligibility — a stronger score usually shows up as a lower rate rather than a different answer on whether you qualify.
How much down payment do I need?
An ADU financing in California typically requires 10-25% equity position. The exact figure moves with your credit profile, occupancy and property type — stronger files land at the low end of that range.
How long does closing take?
An ADU financing in California generally closes in 30-60 days. Appraisal turn times and how quickly you return requested documents are the two things that move that timeline most.
Can I use this program for an investment property?
An ADU financing is available for primary residence, occasionally investment. Occupancy affects both pricing and down payment, so confirm the intended use up front — it changes the terms you are quoted.
Are rates higher for adu financing?
ADU financing rates run at or close to conventional market rates, since these are agency-eligible loans. Your specific number depends on credit, down payment, occupancy and the day you lock.
Do I need to verify my income?
For an ADU financing, income is full documentation, with the projected ADU rent sometimes counted. This is the main way the program differs from a standard conventional loan, and it is usually the reason borrowers choose it.
Can I refinance later into a different program?
Yes. With an ADU financing the usual path is to roll construction financing into a permanent loan once the unit is finaled. Nothing locks you in — plan the exit when you take the loan rather than after.
What documents do I need to apply?
For an ADU financing you will need a government ID, credit authorization and property details, plus approved ADU plans, a contractor bid and city permit documentation.
How do I get started?
Call (888) 703-1840 for a free ADU financing consultation, or use the form on this page. Pre-approval usually takes 1-3 business days, and there is no cost and no hard credit pull to find out what you qualify for.
Ground-up financingHELOC →
Equity credit lineCash-Out Refi →
Access equityFHA 203k →
Renovation loans
Last updated: July 2026. Sources: Federal Housing Finance Agency (FHFA), HUD, VA, CalHFA, CFPB, California DRE. All loans subject to credit approval. Rates subject to change. Mortgage Guide California is an educational publisher. Sponsored by Save Financial, Inc. (NMLS #377740). Equal Housing Lender.
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