Can you build a duplex in San Bernardino, CA?
The city residential framework includes medium and higher-density multifamily zones and RU allows some attached and duplex housing forms, but the exact use table and review path were not fully provided.
Confidence: medium · 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 |
| RL — maximum density | 3.1 units per net acre |
| RS — minimum lot size | 7,200 square feet |
| RS — maximum density | 4.5 units per net acre |
| RU — minimum lot size | 7,200 square feet |
| RU — maximum density | eight units per net acre |
| RU — senior citizen and senior congregate care housing density | 12 units per net acre |
| RM — minimum lot size | 14,400 square feet |
| RM — maximum density | 12 units per net acre |
| RMH — minimum lot size | 20,000 square feet |
| RMH — maximum density | 24 units per net acre |
| RH — minimum lot size | 20,000 square feet |
| RH — maximum density | 31 units per net acre |
| RSH — maximum density | 20 units per acre |
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
The full San Bernardino, CA report breaks down duplex and 2–4 unit feasibility by district, the approval path, and the density/dimensional limits that decide whether the numbers work. First town report is free.
Get the full San Bernardino, CA report free →More about San Bernardino, CA zoning
- Can you build an ADU in San Bernardino, CA?→
- Are short-term rentals allowed in San Bernardino, CA?→
- Is mixed-use development allowed in San Bernardino, CA?→
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.
More California zoning reports →