Practitioner
Financing multifamily ADUs under SB 1211
Construction loans, refinances, and the new products emerging post-SB-1211.
Conventional construction loans for multifamily ADU projects are still maturing. Most lenders treat SB 1211 projects as either (a) refinances of the existing multifamily on improved terms post-completion, or (b) construction-to-perm products at 65–75% LTC.
New entrants in 2025 — including a handful of credit unions and specialty lenders — have begun underwriting against the SB 1211 pro-forma directly, treating the rent upside from new ADUs as part of the global income calculation.
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Related practitioner topics
SB 1211 ADU cost calculatorStick-built ADUs run $250-$450/sf in California. Factory-built drops that significantly.HCD-approved modular ADUsFactory-built ADUs that ship pre-permitted. The fastest delivery path under SB 1211.SB 1211 pro-forma walkthroughLand cost, construction, financing, rent, ROI for a typical multifamily ADU project.SB 1211: first steps for ownersA 5-step checklist from idea to feasibility study.Common SB 1211 mistakesSetback errors, parking miscounts, fire access misses. What to avoid.Appealing an SB 1211 denialCities have to approve compliant projects. Here's what to do if they don't.
How this topic plays in different cities
SB 1211 in FontanaSan Bernardino County · $1,900/moSB 1211 in Santa ClaritaLos Angeles County · $2,400/moSB 1211 in Santa BarbaraSanta Barbara County · $2,900/moSB 1211 in San JoseSanta Clara County · $2,900/moSB 1211 in Redwood CitySan Mateo County · $3,000/moSB 1211 in TorranceLos Angeles County · $2,500/moSB 1211 in OceansideSan Diego County · $2,400/moSB 1211 in Garden GroveOrange County · $2,400/moSB 1211 in Santa RosaSonoma County · $2,300/moSB 1211 in San MateoSan Mateo County · $3,000/moSB 1211 in Palm SpringsRiverside County · $2,200/moSB 1211 in IrvineOrange County · $2,900/mo
By property type
Duplex2-unit · up to 3 new ADUsTriplex3-unit · up to 4 new ADUsFourplex / 4-unit4-unit · up to 5 new ADUs5-unit apartment5-unit · up to 6 new ADUs6-unit apartment6-unit · up to 7 new ADUs8-unit apartment8-unit · up to 10 new ADUs10-unit apartment10-unit · up to 10 new ADUs12-unit apartment12-unit · up to 11 new ADUs16-unit apartment16-unit · up to 12 new ADUs20-unit apartment20-unit · up to 13 new ADUs24-unit apartment24-unit · up to 14 new ADUs32-unit apartment32-unit · up to 16 new ADUs