Tustin, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- R1 primary structure coverage cap
- 40% (§9220 Table 1)
- Accessory building coverage cap
- 30% of rear yard (§9223a)
- R1 minimum lot area
- 7,200 sq. ft. (§9220 Table 1)
- R2 duplex district cap
- 50% (§9220 Table 1)
- R3 multifamily district cap
- 65% (§9220 Table 1)
Summary
In Tustin's R1 Single-Family Residential District, primary structures cannot cover more than 40 percent of the lot under Table 1 of Tustin City Code Section 9220. Detached accessory buildings face a tighter cap: no more than 30 percent of the rear yard, per Section 9223(a).
Zoning Minimum Lot Area/Per Family Unit Minimum Lot Width Lot Coverage ... R1 Single-Family Residential District (2) (Sec. 9223) 7,200 sq. ft./7,200 sq. ft. 60 feet 40 percent ... 2.Accessory buildings only if constructed simultaneously with or subsequent to the main building on the same lot. ... (c)Maximum lot coverage: 30 percent of rear yard.
Full Breakdown
Table 1 of Tustin City Code Section 9220 sets the site development standards for primary residential uses by zoning district, and for the R1 Single-Family Residential District it caps lot coverage at 40 percent, alongside a 7,200-square-foot minimum lot area, 60-foot minimum lot width, and a 30-foot building height limit. That 40 percent figure governs the main dwelling and applies citywide to any R1 lot unless a different limit is noted for a specific development. Section 9223(a) separately regulates detached accessory buildings, defined as those not built simultaneously with the main house: an accessory building can occupy no more than 30 percent of the rear yard, and it also carries its own 25-foot height cap, a 40-foot minimum lot width on cul-de-sac lots, a 50-foot minimum front yard setback, and a 5-foot minimum rear setback, with at least 1,000 square feet of clear, unobstructed usable open space required on the rear third of the lot.
The RA, E4, and R4 residential districts share the same 40 percent primary-structure coverage cap under Table 1, while the R2 duplex district allows 50 percent and the R3 multifamily district allows 65 percent, reflecting the City's tiered approach to density across its residential zones.
Violations & Fines
Exceeding the 40 percent lot coverage cap for a primary R1 structure, or the 30 percent rear-yard cap for a detached accessory building, is a zoning violation that the Building Division catches at plan check and that Code Enforcement can also cite after the fact under the City's administrative citation program: fines up to $100 for a first offense, $200 for a second, and $500 for a third within a year, with a hearing appeal available within ten days under Section 1166.
Frequently Asked Questions
What's the maximum lot coverage for a house in Tustin's R1 zone?
Does my detached garage count toward the same 40 percent limit?
Do other Tustin residential zones allow more coverage?
Sources & Official References
Other rules in Tustin
California rules heatmap·Compare Tustin to another location·View the California building setbacks & zoning overview
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How other cities in Orange County handle lot coverage limits.