San Mateo limits residential building height through Title 27. Single-family zones generally allow 28-35 feet depending on zone. The city applies a daylight plane standard that further limits height near property lines. ADU-specific height limits are 16 feet (detached) to 32 feet (attached) to roof peak.
Building height in San Mateo residential zones is regulated by the development standards in Title 27. Maximum height varies by zone district, typically 28 to 35 feet for primary dwellings. Height is measured from grade to the highest point of the roof. The city applies a daylight plane standard that begins at a specified height at the property line and angles upward, limiting how tall buildings can be close to neighbors. This prevents overshadowing and maintains neighborhood scale. ADU heights under Chapter 27.19 are specifically defined: detached ADUs may be 16 feet to top plateline and 24 feet to roof peak; attached ADUs may reach 24 feet to plateline and 32 feet to peak. Chimneys, antennas, and mechanical equipment may project above the height limit with limitations.
Exceeding height limits requires design review or variance. The daylight plane is strictly enforced. Non-compliant construction may require modification.
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See how San Mateo's structure height limits rules stack up against other locations.
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