SB 1211 for 10-unit apartment in Vacaville
Own a 10-unit apartment in Vacaville? SB 1211 lets you stack 10 new units on top of your existing 10: 8 detached + 2 interior. At Vacaville's median rent of $2,000/mo, that's ~$240K in additional gross annual rent.
The Vacaville scenario
Picture the typical case: a 10-unit 10-unit apartment on a Vacaville block built between 1955 and 1975, with surface parking that hasn't been fully utilized in years. SB 1211 turns that parking into 8 detached units plus 2 interior conversions — 10 new doors that didn't exist before 2024.
Vacaville watch: Bay Area-Sacramento midpoint.
Large multifamily (10+ unit) design playbook
A 10-unit complex is capped at 8 detached ADUs by statute, so the play shifts toward interior conversions: max(1, ⌊units × 25%⌋) = 2 additional units carved from common rooms, oversized lobbies, basement storage, or laundry rooms.
Pro-forma snapshot
| Existing units | 10 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 2 |
| Total new units | 10 |
| Median 1BR rent in Vacaville | $2,000/mo |
| Est. additional gross rent | $240K/yr |
| Estimated total project cost | ~$2,016K |
| Year-1 NOI estimate | ~$180K |
| Stabilized cap rate at cost | 8.9% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Vacaville | 70-110 days |
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