Anti-Mansionization: Ontario vs San Bernardino
How do anti-mansionization rules compare between Ontario, CA and San Bernardino, CA?
Ontario and San Bernardino have similar restriction levels.
Ontario, CA
San Bernardino County
San Bernardino County applies floor area ratios, lot coverage, and height limits in mountain and foothill communities to limit mansionization. Big Bear, Lake Arrowhead, and Crest Forest community plans add stricter design review for oversized structures and bulky additions.
View full Ontario rules →San Bernardino, CA
San Bernardino County
San Bernardino County applies floor area ratios, lot coverage, and height limits in mountain and foothill communities to limit mansionization. Big Bear, Lake Arrowhead, and Crest Forest community plans add stricter design review for oversized structures and bulky additions.
View full San Bernardino rules →Key Facts Comparison
| Fact | Ontario | San Bernardino |
|---|---|---|
| Code basis | Title 8 Land Use Code | Title 8 Land Use Code |
| Tools | FAR, coverage, height | FAR, coverage, height |
| Review | Minor use permit or variance | Minor use permit or variance |
| Overlay | Mountain Community Plans | Mountain Community Plans |
Highlighted rows indicate differences between cities.
Ontario FAQ
Can I expand a hillside cabin?
Often yes with a minor use permit, defensible-space verification, and design review. Ridgeline visibility and tree retention are common conditions of approval.
Do FARs apply in the desert?
Yes, but desert zones often have different ratios. Confirm the applicable Community Plan and base zone with Land Use Services before designing.
San Bernardino FAQ
Can I expand a hillside cabin?
Often yes with a minor use permit, defensible-space verification, and design review. Ridgeline visibility and tree retention are common conditions of approval.
Do FARs apply in the desert?
Yes, but desert zones often have different ratios. Confirm the applicable Community Plan and base zone with Land Use Services before designing.
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