Rialto · Zoning · R-4
Rialto R-4 zoning: height, setbacks and lot size
In Rialto's R-4 zone, generally buildings can be up to 75 ft (6 stories) tall, the front setback is 15 ft and the minimum lot size is 7,200 sq ft, with the conditions listed below (Rialto code, read October 2026).
Key points
- Maximum building height: 75 ft (or six stories)
- Maximum number of stories: 6 stories
- Minimum front setback: 15 ft
- Minimum rear setback: 15 ft
- Minimum lot size: 7,200 sq ft
- Maximum lot coverage: 60%
- Maximum density: 1 unit per 900 sq ft
R-4 (HIGH DENSITY MULTIPLE FAMILY ZONE) is a zoning district in Rialto. Every value below was read from the Rialto Municipal Code and links to its section (read October 2026). State laws such as the ADU and SB 9 rules can allow more on a residential lot. General information, not legal advice — read the code text and check with the city before you build.
Development standards in R-4
The general rule for a typical lot in this zone. Zoning tables often attach notes, such as rules for corner lots, lots next to a residential zone, or new subdivisions only. Open “code text” under a value to see the table cell or sentence it was read from.
| Maximum building height | 75 ft Applies: or six stories § 18.24.030 · code textD. Building height limit, six stories or seventy-five feet; |
|---|---|
| Maximum number of stories | 6 stories § 18.24.030 · code textD. Building height limit, six stories or seventy-five feet; |
| Minimum front setback | 15 ft § 18.24.030 · code textG. Front yard, fifteen feet. |
| Minimum rear setback | 15 ft § 18.24.030 · code textI. Rear yard, fifteen feet; |
| Minimum lot size | 7,200 sq ft § 18.24.030 · code textA. Minimum lot area, seven thousand two hundred square feet; |
| Maximum lot coverage | 60% § 18.24.030 · code textF. Maximum building coverage by all structures, sixty percent of the lot area; |
| Maximum density | 1 unit per 900 sq ft § 18.24.030 · code textE. Minimum lot area per dwelling unit, nine hundred square feet; |
When a different number applies
The code sets other values for particular lots, buildings or locations in R-4:
- Minimum front setback: average of the existing deeper front yards — Where lots with 50% or more of the frontage on one side of the block have deeper front yards § 18.24.030
Not on this page
We did not find a general side setback, FAR limit for R-4 in the zoning tables we read. The code may still set one elsewhere — check the Rialto Municipal Code.
Other Rialto zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Rialto's R-4 zone?
75 ft (or six stories) — Rialto Municipal Code § 18.24.030.
What is the maximum number of stories in Rialto's R-4 zone?
6 stories — Rialto Municipal Code § 18.24.030.
What is the minimum front setback in Rialto's R-4 zone?
15 ft — Rialto Municipal Code § 18.24.030.
What is the minimum rear setback in Rialto's R-4 zone?
15 ft — Rialto Municipal Code § 18.24.030.
What is the minimum lot size in Rialto's R-4 zone?
7,200 sq ft — Rialto Municipal Code § 18.24.030.
General information, not legal advice.
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