ADU Permits: San Jose vs Sunnyvale
How do adu permits rules compare between San Jose, CA and Sunnyvale, CA?
San Jose and Sunnyvale have similar restriction levels.
San Jose, CA
Santa Clara County
San Jose processes ADU applications ministerially under San Jose Municipal Code Section 20.30.150 with a 60-day decision deadline mandated by California Government Code Section 65852.2. Detached new-construction ADUs are capped at 800 sq ft with a 4-foot rear and side setback. Conversions of existing space (garage, basement) face no separate setback, and attached ADUs may reach 1,200 sq ft or 50 percent of the main dwelling, whichever is less. Submittal is through the Permit Center.
View full San Jose rules →Sunnyvale, CA
Santa Clara County
Sunnyvale processes ADU permits ministerially under Sunnyvale Municipal Code Title 19 (Zoning) and California Government Code 65852.2. Sunnyvale was one of the earliest California cities to adopt by-right ADU regulations (2017) and consistently rates as one of the most permissive Silicon Valley jurisdictions. State law requires action within 60 days of a complete application.
View full Sunnyvale rules →Key Facts Comparison
| Fact | San Jose | Sunnyvale |
|---|---|---|
| Governing Section | SJMC 20.30.150 | - |
| Review Type | Ministerial, 60-day clock | Ministerial (no hearing) |
| Detached Max Size | 800 sq ft | - |
| Detached Setback | 4 ft rear and side | - |
| Pre-Approved Plans | Available | Available (AB 434) |
| Code Section | - | SMC Title 19 (Zoning) |
| Decision Window | - | 60 days from complete app |
| Allowed Units | - | 1 ADU + 1 JADU per SFH lot |
| Early Adopter | - | 2017 by-right rules |
Highlighted rows indicate differences between cities.
San Jose FAQ
How long does a San Jose ADU permit take?
By state law and SJMC 20.30.150 the city must act within 60 days of a complete application. Pre-Approved ADU plans typically issue faster because the design itself is already vetted.
Do I need design review for an ADU?
No. ADU permits in San Jose are ministerial under SJMC 20.30.150. Staff check objective standards only and there is no public hearing or discretionary design review for compliant ADUs.
Sunnyvale FAQ
How long does an ADU permit take in Sunnyvale?
California Government Code 65852.2(b)(1) requires Sunnyvale to act on a complete ADU application within 60 days. Sunnyvale's One Stop Permit Center is among the faster Silicon Valley processing offices - many simple ADUs reach permit issuance in 8-14 weeks including correction cycles.
Does Sunnyvale hold a public hearing on ADU permits?
No. SMC Title 19 follows California Government Code 65852.2 and makes ADU and JADU review strictly ministerial. The planner applies objective standards from the SFH zoning regulations - no public hearing, no neighbor notification, and no discretionary design review.
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