San Marcos · Zoning · OP
San Marcos OP zoning: height, setbacks and lot size
In San Marcos's OP zone, generally buildings can be up to 35 feet (3 stories) tall, the front setback is 15 feet and the minimum lot size is 20,000 sq ft, with the conditions listed below (San Marcos code, read October 2026).
Key points
- Maximum building height: 35 feet
- Maximum number of stories: 3 stories
- Minimum front setback: 15 feet
- Minimum side setback: 10 feet (buildings on an interior property line; 25 ft where next to a residential zone)
- Minimum rear setback: 10 feet (buildings on an interior line; 0 ft at an alley; 25 ft next to a residential zone)
- Minimum lot size: 20,000 sq ft (net area (access easements excluded); applies to proposed subdivisions, and the Director and City Engineer may waive it)
- Maximum lot coverage: 45%
- Maximum floor area ratio (FAR): 1.25
OP 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 OP
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 feet § 20.220.050 · code textTable row “Maximum Height”, column “OP”: 35 feet/ 3 stories |
|---|---|
| Maximum number of stories | 3 stories § 20.220.050 · code textTable row “Maximum Height”, column “OP”: 35 feet/ 3 stories |
| Minimum front setback | 15 feet § 20.220.050 · code textTable row “Front PL (6)”, column “OP”: 15 feet |
| Minimum side setback | 10 feet Applies: buildings on an interior property line; 25 ft where next to a residential zone § 20.220.050 · code textTable row “Interior PL, Building”, column “OP”: 10 feet |
| Minimum rear setback | 10 feet Applies: buildings on an interior line; 0 ft at an alley; 25 ft next to a residential zone § 20.220.050 · code textTable row “Alley PL”, column “OP”: 0 feet |
| Minimum lot size | 20,000 sq ft Applies: net area (access easements excluded); applies to proposed subdivisions, and the Director and City Engineer may waive it § 20.220.050 · code textTable row “Lot Area, square feet (s.f.) (4)(7)(8)”, column “OP”: 20,000 s.f. |
| Maximum lot coverage | 45% § 20.220.050 · code textTable row “Maximum Site Coverage”, column “OP”: 45% |
| Maximum floor area ratio (FAR) | 1.25 § 20.220.050 · code textTable row “Maximum Floor Area Ratio”, column “OP”: 1.25 |
Uses in OP
Uses the code's use tables allow in OP, or allow with a permit. Each links to its page with the code section.
- Child care center — Needs a director's permit
- Private school — Needs a conditional use permit
Not on this page
We did not find a general density limit for OP 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 OP zone?
35 feet — San Marcos Municipal Code § 20.220.050.
What is the maximum number of stories in San Marcos's OP zone?
3 stories — San Marcos Municipal Code § 20.220.050.
What is the minimum front setback in San Marcos's OP zone?
15 feet — San Marcos Municipal Code § 20.220.050.
What is the minimum side setback in San Marcos's OP zone?
10 feet (buildings on an interior property line; 25 ft where next to a residential zone) — San Marcos Municipal Code § 20.220.050.
What is the minimum rear setback in San Marcos's OP zone?
10 feet (buildings on an interior line; 0 ft at an alley; 25 ft next to a residential zone) — San Marcos Municipal Code § 20.220.050.
General information, not legal advice.
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