Irwindale · Zoning · A-1
Irwindale A-1 zoning: height, setbacks and lot size
In Irwindale's A-1 zone, buildings can be up to 35 ft tall, the front setback is 20 ft and the minimum lot size is 5,000 sq ft (Irwindale code, read October 2026).
Key points
- Maximum building height: 35 ft
- Minimum front setback: 20 ft
- Minimum side setback: 5 ft (Interior lots; each side of the main building)
- Minimum rear setback: 15 ft
- Minimum lot size: 5,000 sq ft
- Maximum lot coverage: 40%
- Maximum density: 1 unit per 5,000 sq ft
A-1 (Agricultural Zone) is a zoning district in Irwindale. Every value below was read from the Irwindale 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 A-1
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 § 17.28.020 · code textNo building in the A-1 zone shall exceed a height of thirty-five feet. |
|---|---|
| Minimum front setback | 20 ft § 17.28.030 · code textEach lot in the A-1 zone shall have and maintain a required front yard of a depth of not less than twenty feet. |
| Minimum side setback | 5 ft Applies: Interior lots; each side of the main building § 17.28.040 · code textInterior lots shall have and maintain a side yard on each side of the main building of a width of not less than five feet; and |
| Minimum rear setback | 15 ft § 17.28.050 · code textEach lot in the A-1 zone shall have and maintain a rear yard of not less than fifteen feet. |
| Minimum lot size | 5,000 sq ft § 17.28.070 · code textThe minimum required lot area in zone A-1 shall be not less than five thousand square feet. |
| Maximum lot coverage | 40% § 17.28.100 · code textBuildings and structures on lots zoned A-1 shall cover not more than forty percent of the lot area. |
| Maximum density | 1 unit per 5,000 sq ft § 17.28.080 · code textThe minimum lot area per dwelling unit shall be not less than five thousand square feet. |
When a different number applies
The code sets other values for particular lots, buildings or locations in A-1:
- Minimum side setback: 10 ft — Corner lots; side street side § 17.28.040
- Minimum side setback: Existing setback if more than 3 ft and less than 5 ft — A preincorporation setback of this size may be extended for building additions § 17.28.040
Not on this page
We did not find a general stories, FAR limit for A-1 in the zoning tables we read. The code may still set one elsewhere — check the Irwindale Municipal Code.
Other Irwindale zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Irwindale's A-1 zone?
35 ft — Irwindale Municipal Code § 17.28.020.
What is the minimum front setback in Irwindale's A-1 zone?
20 ft — Irwindale Municipal Code § 17.28.030.
What is the minimum side setback in Irwindale's A-1 zone?
5 ft (interior lots; each side of the main building) — Irwindale Municipal Code § 17.28.040.
What is the minimum rear setback in Irwindale's A-1 zone?
15 ft — Irwindale Municipal Code § 17.28.050.
What is the minimum lot size in Irwindale's A-1 zone?
5,000 sq ft — Irwindale Municipal Code § 17.28.070.
General information, not legal advice.
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