San Diego is a high-cost housing market, so the line between a conforming mortgage and a jumbo mortgage matters for a large share of local buyers. For 2026, the Federal Housing Finance Agency lists the one-unit conforming loan limit for San Diego County at $1,104,000. The limits rise to $1,413,350 for two units, $1,708,400 for three units, and $2,123,100 for four units.
What is a conforming loan?
A conforming loan is a mortgage that meets the size and other eligibility standards used by Fannie Mae and Freddie Mac. FHFA adjusts the loan-size limits annually. The national one-unit baseline for 2026 is $832,750, while higher-cost areas can receive higher limits. San Diego County qualifies for a higher local limit.
When does a San Diego mortgage become jumbo?
For a typical one-unit San Diego County purchase in 2026, the key number is the loan amount, not necessarily the home price. A buyer can purchase a home priced above $1,104,000 and still use a conforming loan if the actual loan amount stays at or below the applicable conforming limit and all other program requirements are met.
Once the required loan amount moves above the conforming limit, the financing is generally considered jumbo or otherwise non-conforming. Jumbo underwriting can differ by lender. Credit, reserves, income documentation, debt-to-income ratio, property type and down payment can all affect available options.
Why this matters in San Diego
A difference of a few thousand dollars in loan amount can sometimes change which set of products a borrower is comparing. That is why it can be useful to model more than one structure before writing an offer—especially when the purchase price sits near the conforming threshold.
Example
Suppose a buyer is considering a $1.35 million one-unit home. Whether that transaction uses conforming or jumbo financing depends partly on the down payment and resulting loan amount. A larger down payment might keep the loan at or below the county conforming limit, while a smaller down payment could push the loan into jumbo territory.
Is jumbo financing automatically worse?
No. Jumbo loans are not inherently “bad” or a last resort. They are simply loans outside the conforming framework. Depending on market conditions and a borrower's profile, jumbo financing may be competitive. The right comparison is the full structure: rate, fees, down payment, reserve requirements, documentation and long-term goals.
What should San Diego buyers do before making an offer?
- Know the expected loan amount, not just the purchase price.
- Ask whether the scenario falls under conforming, high-balance, jumbo, VA or another program.
- Compare cash-to-close and reserve requirements across realistic structures.
- For complex income, have documentation reviewed early instead of waiting until escrow.
This article is for general educational purposes and is not a commitment to lend or a guarantee of qualification. Loan limits and underwriting guidelines can change, and individual eligibility depends on the complete loan file.