Lot Coverage Limits: Fontana vs Rialto
How do lot coverage limits rules compare between Fontana, CA and Rialto, CA?
Fontana and Rialto have similar restriction levels.
Fontana, CA
San Bernardino County
Fontana FMC Title 17 caps the share of a lot that buildings may occupy. R-1 zones typically allow 40-50 percent coverage. Accessory structures count; state ADU law guarantees an 800 sq ft ADU.
View full Fontana rules →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 →Key Facts Comparison
| Fact | Fontana | Rialto |
|---|---|---|
| Governing Code | FMC Title 17 | - |
| R-1 Typical | 40-50% coverage | - |
| Multi-Family | 50-60% coverage | - |
| ADU Minimum | 800 sq ft guaranteed | - |
| Open Patios | Often excluded | - |
| - | - |
Highlighted rows indicate differences between cities.
Fontana FAQ
What counts toward lot coverage in Fontana?
Enclosed buildings including the primary home, garages, and sheds generally count. Open patios, pools, and driveways are typically excluded from coverage calculations.
Can an ADU push my lot over coverage limits?
Under California Gov Code 65852.2, Fontana must allow an ADU of at least 800 square feet even if standard lot coverage rules would otherwise block it.
Rialto FAQ
Compare other topics
See how Fontana and Rialto compare on other ordinance categories.
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