SB 1211 for Duplex in San Diego
San Diego's SB 1211 math for duplex owners: 2 detached ADUs (the §66323 cap), plus 1 interior conversions. Total: 3 new homes. At San Diego's median rent of $2,300/mo, that's ~$83K in additional gross annual rent.
The San Diego scenario
Run it as a sequence: stabilize existing 2 units → permit 2 detached ADUs ministerially under §66314 → convert 1 interior space into rentable units → re-tenant at San Diego medians.
Local tip for San Diego: San Diego's ADU Bonus Program allows additional density in transit areas.
Small multifamily (2–4 unit) design playbook
Small multifamily lots are usually constrained on width before they're constrained on count. With a 2-unit existing footprint, the binding constraint becomes side-yard setbacks (4 ft min) and the 18-ft height limit. Two-story stacked-flat ADUs over surface parking are the highest-yield typology.
Pro-forma snapshot
| Existing units | 2 |
| Detached ADUs (SB 1211) | 2 |
| Interior conversions | 1 |
| Total new units | 3 |
| Median 1BR rent in San Diego | $2,300/mo |
| Est. additional gross rent | $83K/yr |
| Estimated total project cost | ~$806K |
| Year-1 NOI estimate | ~$62K |
| Stabilized cap rate at cost | 7.7% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in San Diego | 75-110 days |
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