Can you build an ADU in San Bernardino, CA?
The supplied city sources do not include a current city ADU chapter. A 2026 ADU amendment was documented for San Bernardino County, but that should not be assumed to apply inside the City of San Bernardino.
Confidence: low · Last researched June 2026
Dimensional standards in San Bernardino, CA
| RE — minimum lot size | 1 net acre per unit |
| RL — minimum average lot size | 10,800 square feet |
| RS — minimum lot size | 7,200 square feet |
| RU — minimum lot size | 7,200 square feet |
| RM — minimum lot size | 14,400 square feet |
| RMH — minimum lot size | 20,000 square feet |
| RH — minimum lot size | 20,000 square feet |
Related questions
What is the minimum lot size in San Bernardino, CA?
Minimum lot size depends on the zoning district — RE: 1 net acre per unit; RL: 10,800 square feet; RS: 7,200 square feet; RU: 7,200 square feet.
What zoning districts are in San Bernardino, CA?
San Bernardino, CA includes districts such as RE (Residential Estate), RL (Residential Low), RS (Residential Suburban), RU (Residential Urban), RM (Residential Medium), RMH (Residential Medium High), RH (Residential High), RSH (Residential Student Housing).
Are there flood zones or overlay districts in San Bernardino, CA?
Flood risk is the only clearly supported environmental constraint in the provided source set. The materials do not include a full city environmental overlay chapter, so other common constraints such as hillsides, wetlands, habitat, or airport compatibility cannot be confirmed from the supplied sources.
Full investor analysis
You've seen the general rule. The full San Bernardino, CA report shows which districts allow ADUs by-right vs. by special permit, the approval path and timeline, and the overlay/flood constraints that quietly kill ADU projects here. First town report is free.
Get the full San Bernardino, CA report free →More about San Bernardino, CA zoning
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This summary is AI-generated from public municipal sources and is not legal, engineering, or land-use advice. Always verify zoning with San Bernardino, CA officials before making decisions.
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