Irwindale R-1 zoning: height, setbacks and lot size

R-1 (Single-Family Residential 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 R-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 Applies: or 2 stories, whichever is less § 17.16.090 · code text No lot or parcel of land in zone R-1 shall have a building or structure in excess of two stories or thirty-five feet in height, whichever is less.
Maximum number of stories	2 stories Applies: or 35 feet, whichever is less § 17.16.090 · code text No lot or parcel of land in zone R-1 shall have a building or structure in excess of two stories or thirty-five feet in height, whichever is less.
Minimum front setback	20 ft § 17.16.070 · code text Each lot in the R-1 zone shall maintain a front yard of not less than twenty feet in depth.
Minimum side setback	5 ft Applies: Interior lots, on each side of the main building § 17.16.070 · code text The five-foot side yard setbacks mentioned in subdivisions 1 and 2 of this subsection shall apply in all cases except where there is a preincorporation setback of less than five feet but more than three feet, in which case the preexisting setback may be extended for building additions.
Minimum rear setback	15 ft § 17.16.070 · code text Each lot in zone R-1 shall maintain a rear yard of not less than fifteen feet in depth.
Minimum lot size	5,000 sq ft Applies: when no number follows the zoning symbol § 17.16.050 · code text Five thousand square feet when no number follows the zoning symbol.
Maximum density	1 unit per 5,000 sq ft Applies: Lot area per dwelling cannot be less than the minimum lot area; 5,000 sq ft when no number follows the zoning symbol § 17.16.120 · code text The lot area per dwelling unit shall be not less than the minimum required lot area.

When a different number applies

The code sets other values for particular lots, buildings or locations in R-1:

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 § 17.16.070
Minimum side setback: 10 ft — corner lots: street side § 17.16.070

Not on this page

We did not find a general lot coverage, FAR limit for R-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

HomeownersArchitects and designersDevelopersReal estate agents

Frequently asked questions

What is the maximum building height in Irwindale's R-1 zone?

35 ft (or 2 stories, whichever is less) — Irwindale Municipal Code § 17.16.090.

What is the maximum number of stories in Irwindale's R-1 zone?

2 stories (or 35 feet, whichever is less) — Irwindale Municipal Code § 17.16.090.

What is the minimum front setback in Irwindale's R-1 zone?

20 ft — Irwindale Municipal Code § 17.16.070.

What is the minimum side setback in Irwindale's R-1 zone?

5 ft (interior lots, on each side of the main building) — Irwindale Municipal Code § 17.16.070.

What is the minimum rear setback in Irwindale's R-1 zone?

15 ft — Irwindale Municipal Code § 17.16.070.

General information, not legal advice.