SB 1211 for Duplex in Fairfield
In Fairfield, a 2-unit duplex just became one of the highest-yield SB 1211 typologies — 3 new homes, ministerially approved. At Fairfield's median rent of $2,100/mo, that's ~$76K in additional gross annual rent.
The Fairfield scenario
The capital stack on a typical Fairfield duplex project: existing equity (the lot itself, owned outright in many cases), construction loan against the new ADU appraised value, refi at completion against the stabilized rent roll.
Local tip for Fairfield: Suburban demand corridor.
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 Fairfield | $2,100/mo |
| Est. additional gross rent | $76K/yr |
| Estimated total project cost | ~$806K |
| Year-1 NOI estimate | ~$57K |
| Stabilized cap rate at cost | 7.1% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Fairfield | 70-110 days |
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