Anti-Mansionization: San Jose vs Santa Clara
How do anti-mansionization rules compare between San Jose, CA and Santa Clara, CA?
San Jose and Santa Clara have similar restriction levels.
San Jose, CA
Santa Clara County
San Jose's zoning code (SJMC Title 20) controls oversized single-family construction through floor-area ratio, lot coverage, height, and daylight-plane setback rules tied to each base zone (R-1, R-2, R-M), preventing out-of-scale homes that overshadow neighbors.
View full San Jose rules →Santa Clara, CA
Santa Clara County
Santa Clara County has no countywide mansionization ordinance, but Title C zoning sets floor area ratio caps, lot coverage limits, and tiered setbacks in residential and rural districts of unincorporated areas, including hillside, scenic, and AP-Agricultural Preserve overlays.
View full Santa Clara rules →Key Facts Comparison
| Fact | San Jose | Santa Clara |
|---|---|---|
| Base R-1 FAR | 0.45 floor-area ratio | - |
| Lot coverage | 40 percent typical | - |
| Height limit | 30 feet two stories | - |
| Front setback | 20 feet typical | - |
| Code | SJMC Title 20 zoning | - |
| Zoning code | - | SCC Title C residential rules |
| R-1 FAR range | - | 0.40 to 0.45 typical |
| Hillside overlay | - | HS slope-based height limits |
| Reviewing agency | - | County Planning and Development |
| Scenic review | - | Architectural and Site Approval |
Highlighted rows indicate differences between cities.
San Jose FAQ
Can I build a second story on my R-1 home?
Yes, within the base zone's 30-foot height and FAR limits. Second stories must respect the daylight-plane envelope and the Residential Design Handbook, with stepped-back upper floors away from neighbor windows.
What's a daylight plane?
An imaginary sloped plane rising from the side property line that upper stories cannot poke through. It protects neighbors' light and privacy by forcing tall walls to step back as height increases.
Santa Clara FAQ
Does Santa Clara County have a Baseline Mansionization Ordinance?
No single BMO exists. The county uses district-specific FAR caps, hillside slope-density rules, and Architectural and Site Approval in scenic corridors instead, with each unincorporated zone applying tailored bulk standards.
How do I find the FAR cap for my parcel?
Use the County Planning Department's online parcel viewer to identify base zoning and overlays. The applicable Title C section then provides FAR, lot coverage, height, and setback figures for that specific district.
Compare other topics
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