ADUs on Solana Beach multifamily lots
Apartment and condo-style lots have their own state ADU allowances, applied in Solana Beach alongside the city's submittal rules.
State allowances (Gov. Code §66323)
| Conversions | Non-livable space (storage, boiler rooms, attics, basements, garages); at least one and up to 25% of existing units |
|---|---|
| Detached, existing multifamily | Up to eight, not exceeding the number of existing units |
| Detached, proposed multifamily | Up to two |
| Setbacks | No more than 4 ft side and rear |
Solana Beach notes
- Sprinklers: if the multifamily building is sprinklered, the ADU must be (Solana Beach ADU Submittal Process and Basic Plan Requirements (June 2025))
- One sewer lateral per APN
- Coastal Commission approval letter with the submittal
Code limits
- Converted non-livable space: at least one, up to 25% of existing units
- Detached on an existing multifamily lot: up to eight, not more than existing units
- Detached with proposed multifamily: up to two
Also checked Oct 14, 2026: SBMC §17.60.210(A) (Ord. 542, 2026).
Sources, checked Oct 14, 2026: Gov. Code §66323 · Solana Beach ADU Submittal Process and Basic Plan Requirements (June 2025).
FAQ
How many ADUs can a multifamily lot have?
State law allows conversions of non-livable space up to 25% of existing units (at least one), and up to eight detached ADUs on a lot with an existing multifamily dwelling, not exceeding the number of existing units.
Will an ADU require sprinklers in my building?
Solana Beach treats the whole building as the primary residence: if it has sprinklers, the ADU needs them. State law says ADU construction can't trigger sprinklers in the existing building.
Do PADU plans work on multifamily lots?
The PADU guide says plans may be used in zones with existing single-family or multifamily residential units.