San Marcos · Zoning · OS
San Marcos OS zoning: height, setbacks and lot size
In San Marcos's OS zone, generally buildings can be up to 15 feet (1 story) tall and the front setback is 10 feet, with the conditions listed below (San Marcos code, read October 2026).
Key points
- Maximum building height: 15 feet
- Maximum number of stories: 1 story
- Minimum front setback: 10 feet (Public right-of-way)
- Minimum side setback: 10 feet (Internal property line)
OS (Open Space Zone) is a zoning district in San Marcos. Every value below was read from the San Marcos 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 OS
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 | 15 feet § 20.240.050 · code textTable row “Building Height”, column “OS Zone”: 15 feet |
|---|---|
| Maximum number of stories | 1 story § 20.240.050 · code textTable row “Stories”, column “OS Zone”: 1 |
| Minimum front setback | 10 feet Applies: Public right-of-way § 20.240.050 · code textTable row “Public Right-of-Way”, column “OS Zone”: 10 feet |
| Minimum side setback | 10 feet Applies: Internal property line § 20.240.050 · code textTable row “Internal Property Line”, column “OS Zone”: 10 feet |
When a different number applies
The code sets other values for particular lots, buildings or locations in OS:
- Minimum side setback: 15 feet — Adjacent to a residential zone § 20.240.050
Not on this page
We did not find a general rear setback, lot size, lot coverage, FAR, density limit for OS in the zoning tables we read. The code may still set one elsewhere — check the San Marcos Municipal Code.
Other San Marcos zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in San Marcos's OS zone?
15 feet — San Marcos Municipal Code § 20.240.050.
What is the maximum number of stories in San Marcos's OS zone?
1 story — San Marcos Municipal Code § 20.240.050.
What is the minimum front setback in San Marcos's OS zone?
10 feet (public right-of-way) — San Marcos Municipal Code § 20.240.050.
What is the minimum side setback in San Marcos's OS zone?
10 feet (internal property line) — San Marcos Municipal Code § 20.240.050.
General information, not legal advice.
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