Structure Height Limits: Mountain View vs Palo Alto
How do structure height limits rules compare between Mountain View, CA and Palo Alto, CA?
Mountain View has fewer restrictions than Palo Alto.
Mountain View, CA
Santa Clara County
Mountain View R1 zones cap homes at 30 feet and 2 stories. Accessory structures are limited to 14 feet. Downtown and North Bayshore Precise Plans allow up to 180 feet in some districts.
View full Mountain View rules →Palo Alto, CA
Santa Clara County
Palo Alto limits residential heights to 30 feet (two stories) in R-1 districts, with downtown and commercial zones allowing greater heights subject to design and historic review.
View full Palo Alto rules →Key Facts Comparison
| Fact | Mountain View | Palo Alto |
|---|---|---|
| R1 max height | 30 feet, 2 stories | - |
| R3 max height | 45 feet | - |
| Accessory height | 14 feet standard | - |
| Detached ADU | 16 feet per state law | - |
| North Bayshore max | 180 feet | - |
| R-1 Height Limit | - | 30 ft, 2 stories |
| Daylight Plane | - | Upper floor taper required |
| Downtown Zones | - | 50 ft with design review |
| ADU Height | - | 16-18 ft per state law |
| Historic Review | - | HRB for designated areas |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Can I add a second story to my R1 home?
Yes, up to 30 feet total height, subject to the daylight plane that limits wall height near side property lines to preserve neighbor sunlight.
How tall can a detached ADU be?
State law allows detached ADUs up to 16 feet, and up to 18 feet if within a half-mile of transit and meeting certain conditions.
Palo Alto FAQ
Can I add a second story to my home?
Yes within the 30 ft and two-story limit, subject to daylight plane and setback requirements. Historic districts and Eichler neighborhoods may face additional review.
What is the daylight plane?
An imaginary sloped plane angled from the side property line that limits how close upper floors can come to neighbors. It protects light, air, and privacy.
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