Occupancy Limits: Ontario vs Rialto
How do occupancy limits rules compare between Ontario, CA and Rialto, CA?
Rialto has fewer restrictions than Ontario.
Ontario, CA
San Bernardino County
Ontario ties STR occupancy to bedroom count and California Building Code per-occupant floor area. A common cap is two guests per bedroom plus two additional, with events and parties typically prohibited.
View full Ontario rules →Rialto, CA
San Bernardino County
Rialto has no STR-specific guest-occupancy cap in its municipal code. Title 18 Zoning does not define 'short-term rental,' so no STR overlay (such as Palm Springs' '2 per bedroom + 2' rule) applies. Residential occupancy is governed by general standards: California Building Code (Title 24 CCR Part 2) minimum room area for sleeping rooms, and HUD's 'Keating Memo' two-persons-per-bedroom-plus-one fair-housing guideline. Rialto MC §3.08 simply defines a 'transient' as any occupant for 30 consecutive days or less, without setting a maximum-guest threshold.
View full Rialto rules →Key Facts Comparison
| Fact | Ontario | Rialto |
|---|---|---|
| Typical formula | 2 per bedroom plus 2 | - |
| Bedroom minimum | 70 sq ft for one | - |
| Events and parties | Prohibited at STRs | - |
| Posted inside unit | Required | - |
| Over-occupancy | Citation and permit risk | - |
| STR Occupancy Cap | - | None codified in Rialto MC |
| Federal Guidance | - | HUD Keating Memo — 2 per bedroom + 1 |
| Building Code Floor | - | CBC Ch. 12 — 70 sq ft / sleeping room |
| Transient Definition | - | ≤30 consecutive days (MC §3.08) |
| Complaint Line | - | Community Compliance 909-820-2689 |
Highlighted rows indicate differences between cities.
Ontario FAQ
Can I host 20 guests in a 3-bedroom Ontario STR?
No. The permit cap for a 3-bedroom home is typically around 8 guests, and events that inflate attendance beyond the cap are prohibited under the STR program.
Do babies and toddlers count toward Ontario STR occupancy?
Most STR ordinances exempt children under a certain age (commonly 2 or 3) from the occupant count. Confirm your specific permit conditions with Planning.
Rialto FAQ
Is there a maximum guest count for Airbnbs in Rialto?
No STR-specific cap exists in Rialto's municipal code. Hosts should use the HUD 2-per-bedroom-plus-1 standard and California Building Code Chapter 12 minimum-room-area requirements as baseline.
Can I host a 12-person stay in a 3-bedroom Rialto home?
12 guests in 3 bedrooms exceeds the HUD 2-per-bedroom-plus-1 guideline (which would cap at 7). While no specific Rialto STR ordinance prohibits it, overcrowding can trigger Title 8 nuisance enforcement and Chapter 9.50 noise citations.
Compare other topics
See how Ontario and Rialto compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool