South San Francisco, CA loan limits: 2026 conforming and FHA context

Start with the dated local finding: South San Francisco, CA is connected to San Mateo County for this 2026 source comparison. The published one-unit conforming limit is $1,249,125, while the published one-unit FHA limit is $1,249,125. Those figures organize different program categories; $1,249,125 is not a conventional loan offer, and $1,249,125 is not an FHA eligibility finding. For South San Francisco, CA, starting with San Mateo County keeps the limits attached to the county or county-equivalent area used in the official files. Borrowers in South San Francisco, CA still need to confirm the selected property's location and legal unit count, because the relevant San Mateo County row follows the property rather than the city label or mailing address alone. Around South San Francisco, CA, mailing cities and ZIP codes can cross county boundaries, so the official property jurisdiction should be verified instead of inferred from a familiar place name. Keep San Mateo County as South San Francisco, CA's confirmed county row before comparing the $1,249,125 and $1,249,125 program boundaries.

For borrowers in South San Francisco, CA, San Mateo County's conforming limit rises from $1,249,125 for one unit to $2,402,625 for four units, while the FHA figures move from $1,249,125 to $2,402,625. For the decision at hand, the higher $2,402,625 and $2,402,625 amounts apply to the published four-unit category; they do not apply to a one-unit home merely because a borrower wants a larger loan.