Lot Coverage Limits: Rialto vs San Bernardino
How do lot coverage limits rules compare between Rialto, CA and San Bernardino, CA?
Rialto and San Bernardino have similar restriction levels.
Rialto, CA
San Bernardino County
San Bernardino County limits maximum lot coverage by buildings to 40-50% in residential zones, 20-30% in rural zones, with impervious surface limits on hillsides and near watercourses.
View full Rialto rules →San Bernardino, CA
San Bernardino County
San Bernardino Development Code limits maximum lot coverage to 40-50% in single-family residential zones, up to 60% in multi-family and commercial zones, with stormwater and landscaping requirements for larger projects.
View full San Bernardino rules →Key Facts Comparison
| Fact | Rialto | San Bernardino |
|---|---|---|
| - | - | |
| Single-Family Coverage | - | 40-50% typical |
| Multi-Family Coverage | - | Up to 55-60% |
| Stormwater Threshold | - | 1 acre disturbed |
| LID Threshold | - | 2,500 sq ft impervious |
| ADU Preemption | - | Up to 800 sq ft |
Highlighted rows indicate differences between cities.
Rialto FAQ
San Bernardino FAQ
Does my driveway count toward San Bernardino lot coverage?
Driveways typically do not count toward building coverage, but they do count toward impervious surface calculations and stormwater triggers for larger projects. Permeable pavers can reduce impervious calculations.
What if adding an ADU pushes me over the lot coverage limit?
State ADU law (Gov Code 65852.2) preempts local lot coverage limits for ADUs up to 800 sq ft. The ADU cannot be denied solely because it pushes the total over coverage standards.
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