One of the most underused tools in California mortgage qualification is rental income from an accessory dwelling unit. Whether the ADU is already built or you are planning to add one, understanding how lenders treat this income can meaningfully expand your buying power.
When You Can Use ADU Income to Qualify
Existing Permitted ADU with Lease
The cleanest scenario: you are buying or refinancing a property that already has a permitted ADU with a tenant in place. Most lenders will count 75% of the documented rent (from the lease agreement) as qualifying income. Example: ADU rents for $2,400/month → $1,800/month in qualifying income. At a 43% DTI on a $10,000 monthly income borrower, this $1,800 is enough to support approximately $270,000 in additional loan amount.
Existing ADU Without a Current Tenant
If the ADU is vacant but permitted, many lenders will use 75% of market rent based on a comparable rent schedule from the appraiser. Not all lenders allow this — DiVita Home Finance works with lenders who do.
Fannie Mae ADU Income Guidelines
Fannie Mae updated guidelines to allow lenders to count rental income from ADUs on purchase transactions using an appraiser’s market rent opinion — even without a lease — as long as the ADU is habitable and permitted. This is a significant expansion that not all banks have adopted yet.
When ADU Income Cannot Be Used
- Unpermitted ADUs: Lenders cannot use income from unpermitted units. They also cannot add value to the property for the ADU. Getting permits is worth the effort.
- Future ADU construction: If the ADU does not yet exist, income projections generally cannot be used at origination for conventional loans.
- Short-term rentals (Airbnb): Some lenders require a two-year history of Airbnb income (Schedule E) before counting it.
Bank Statement Loan Option for ADU Investors
Self-employed California homeowners who receive ADU rental income but whose tax returns do not reflect the full picture can use a bank statement loan. DiVita Home Finance offers bank statement programs where rental deposits count toward qualifying income based on actual bank deposits over 12–24 months. This is particularly powerful for owners of multiple ADU properties.
📞 Call DiVita Home Finance at (800) 239-1103 to run the numbers on your ADU income and see how much more home you qualify for.
About DiVita Home Finance
DiVita Home Finance is a small, family-owned mortgage company based in Marin County, California. When you call, you speak directly with Michael DiVita — the owner — not a call center, not an out-of-state rep, not someone reading from a script. We’re here for a low-key, no-obligation conversation about your situation.
We take your privacy seriously. We will never sell your information to third-party lenders or lead generation companies — unlike many of the large mortgage platforms. Your inquiry stays with us, period.
📞 Call: (800) 239-1103 | 💬 Text Michael directly: (310) 849-9124
