Retaining Walls: El Cajon vs San Marcos
How do retaining walls rules compare between El Cajon, CA and San Marcos, CA?
El Cajon and San Marcos have similar restriction levels.
El Cajon, CA
San Diego County
Retaining walls in El Cajon under 4 feet in height (measured from bottom of footing) are generally exempt from building permits. Walls over 4 feet require a building permit and engineered plans. Multiple tiered walls may be considered a single wall for height calculations.
View full El Cajon rules →San Marcos, CA
San Diego County
San Marcos requires grading permits for retaining walls exceeding 3 feet in height and engineering review for taller structures. Retaining walls up to 4 feet from the bottom of footing (without surcharge) are exempt from building permits but walls over 3 feet still require a grading permit.
View full San Marcos rules →Key Facts Comparison
| Fact | El Cajon | San Marcos |
|---|---|---|
| Permit Exempt | Under 4 ft, not retaining slope | - |
| Permit Required | Over 4 ft or retaining slope | - |
| Engineering | May need licensed engineer plans | - |
| Drainage | Weep holes or drainage required | - |
| Contact | Building Division — 619-441-1726 | - |
| Building Permit Exempt | - | Up to 4 ft (no surcharge) |
| Grading Permit Required | - | Over 3 ft height |
| Engineering Required | - | Taller walls |
| Code Section | - | Chapter 17.32 |
| Development Services | - | (760) 744-1050 x3233 |
Highlighted rows indicate differences between cities.
El Cajon FAQ
Do I need a permit for a retaining wall in El Cajon?
Retaining walls under 4 feet (from bottom of footing) that do not retain a slope are generally exempt. Walls over 4 feet or retaining slopes require a building permit.
Do retaining walls need engineering plans?
Walls over 4 feet typically require engineered plans from a licensed civil engineer. Walls retaining slopes or supporting structures may require engineering regardless of height.
Can I combine a retaining wall and fence?
Yes, but the total height must comply with both retaining wall permit requirements and fence height limits. The combination may require a building permit and zoning review.
San Marcos FAQ
Do I need a permit for a retaining wall in San Marcos CA?
Retaining walls up to 4 feet (from bottom of footing, no surcharge) are exempt from building permits. However, walls over 3 feet measured from top of footing require a grading permit from Development Services.
When do I need an engineer for a retaining wall in San Marcos?
Walls 3 feet or taller must meet the city's Retaining Wall Requirements policy, which may include engineered plans by a licensed civil or structural engineer. Contact Development Services at (760) 744-1050 x3233 for specific requirements.
What is the grading permit process for retaining walls in San Marcos?
Apply through the Development Services department. Submit plans showing wall height, location, drainage, and engineering details as required. The city reviews plans against Chapter 17.32 grading standards before issuing permits.
Compare other topics
See how El Cajon and San Marcos compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool