Rialto · Zoning · R-3
Rialto R-3 zoning: height, setbacks and lot size
In Rialto's R-3 zone, buildings can be up to 35 ft (3 stories) tall, the front setback is 15 ft and the minimum lot size is 1 acre (Rialto code, read October 2026).
Key points
- Maximum building height: 35 ft
- Maximum number of stories: 3 stories
- Minimum front setback: 15 ft
- Minimum side setback: 5 ft
- Minimum rear setback: 15 ft
- Minimum lot size: 1 acre
- Maximum density: 1 unit per 2,000 sq ft of net lot area
R-3 (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-3
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 | 35 ft § 18.22.030 · code textThe maximum building height shall be three stories, and not exceeding thirty-five feet. |
|---|---|
| Maximum number of stories | 3 stories § 18.22.030 · code textThe maximum building height shall be three stories, and not exceeding thirty-five feet. |
| Minimum front setback | 15 ft § 18.22.030 · code textThe minimum front yard setback shall be fifteen feet. |
| Minimum side setback | 5 ft § 18.22.030 · code textThe minimum interior side yard setback shall be five feet. |
| Minimum rear setback | 15 ft § 18.22.030 · code textThe minimum rear yard setback shall be fifteen feet. |
| Minimum lot size | 1 acre § 18.22.030 · code textThe minimum site area when developed pursuant to this chapter shall be one acre. |
| Maximum density | 1 unit per 2,000 sq ft of net lot area § 18.22.030 · code textMinimum lot area per dwelling unit shall be two thousand square feet of net lot area. |
When a different number applies
The code sets other values for particular lots, buildings or locations in R-3:
- Minimum side setback: 15 ft — Where the side yard is adjacent to a public dedicated street or alley § 18.22.030
Not on this page
We did not find a general lot coverage, FAR limit for R-3 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-3 zone?
35 ft — Rialto Municipal Code § 18.22.030.
What is the maximum number of stories in Rialto's R-3 zone?
3 stories — Rialto Municipal Code § 18.22.030.
What is the minimum front setback in Rialto's R-3 zone?
15 ft — Rialto Municipal Code § 18.22.030.
What is the minimum side setback in Rialto's R-3 zone?
5 ft — Rialto Municipal Code § 18.22.030.
What is the minimum rear setback in Rialto's R-3 zone?
15 ft — Rialto Municipal Code § 18.22.030.
General information, not legal advice.
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