Walnut · Zoning · R-4
Walnut R-4 zoning: height, setbacks and lot size
In Walnut's R-4 zone, buildings can be up to 45 ft (3 stories) tall, the front setback is 0 ft and the minimum lot size is 5,000 sq. ft. (Walnut code, read October 2026).
Key points
- Maximum building height: 45 ft
- Maximum number of stories: 3 stories
- Minimum front setback: 0 ft
- Minimum side setback: 5 ft
- Minimum rear setback: 10 ft
- Minimum lot size: 5,000 sq. ft.
- Maximum lot coverage: 75%
- Maximum density: 32.0 to 36.0 units per acre (the code sets a range: at least 32.0, at most 36.0)
R-4 is a zoning district in Walnut. Every value below was read from the Walnut 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 | 45 ft § 6.34.040 · code textTable row “Maximum Height”, column “R-4”: 45′ |
|---|---|
| Maximum number of stories | 3 stories § 6.34.040 · code textTable row “Maximum Number of Stories”, column “R-4”: 3 |
| Minimum front setback | 0 ft § 6.34.040 · code textTable row “Front Yard Setbacks”, column “R-4”: 0′ |
| Minimum side setback | 5 ft § 6.34.040 · code textTable row “Minimum Side Yard Setbacks”, column “R-4”: 5′ |
| Minimum rear setback | 10 ft § 6.34.040 · code textTable row “Minimum Rear Yard Setbacks”, column “R-4”: 10′ |
| Minimum lot size | 5,000 sq. ft. § 6.34.040 · code textTable row “Minimum Lot Size (sq. ft.)”, column “R-4”: 5,000 sq. ft. |
| Maximum lot coverage | 75% § 6.34.040 · code textTable row “Lot Coverage”, column “R-4”: 75% |
| Maximum density | 32.0 to 36.0 units per acre Applies: the code sets a range: at least 32.0, at most 36.0 § 6.34.040 · code textTable row “Density”, column “R-4”: 32.0 – 36.0 du/ac |
When a different number applies
The code sets other values for particular lots, buildings or locations in R-4:
- Minimum front setback: 20 ft — Adjacent to Existing Residential § 6.34.040
- Minimum side setback: 20 ft — Adjacent to Existing Residential § 6.34.040
- Minimum rear setback: 20 ft — Adjacent to Existing Residential § 6.34.040
Not on this page
We did not find a general FAR limit for R-4 in the zoning tables we read. The code may still set one elsewhere — check the Walnut Municipal Code.
Other Walnut zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Walnut's R-4 zone?
45 ft — Walnut Municipal Code § 6.34.040.
What is the maximum number of stories in Walnut's R-4 zone?
3 stories — Walnut Municipal Code § 6.34.040.
What is the minimum front setback in Walnut's R-4 zone?
0 ft — Walnut Municipal Code § 6.34.040.
What is the minimum side setback in Walnut's R-4 zone?
5 ft — Walnut Municipal Code § 6.34.040.
What is the minimum rear setback in Walnut's R-4 zone?
10 ft — Walnut Municipal Code § 6.34.040.
General information, not legal advice.
Ask about a Walnut property in R-4
Ask GoCodebook what you can build at a specific address and get an answer that cites the section.
Ask your question