Retaining Walls: El Cajon vs San Diego
How do retaining walls rules compare between El Cajon, CA and San Diego, CA?
El Cajon and San Diego 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 Diego, CA
San Diego County
Retaining walls over 3 feet (from footing to top) require a building permit under SDMC 129.0202. Walls supporting a surcharge need a permit regardless of height. Engineering calculations by a licensed professional required for walls over 3 feet. Multiple tiered walls must comply with spacing requirements.
View full San Diego rules →Key Facts Comparison
| Fact | El Cajon | San Diego |
|---|---|---|
| Permit Exempt | Under 4 ft, not retaining slope | - |
| Permit Required | Over 4 ft or retaining slope | - |
| Engineering | May need licensed engineer plans | Required over 3 ft |
| Drainage | Weep holes or drainage required | Weep holes or drain tile |
| Contact | Building Division — 619-441-1726 | - |
| Permit Threshold | - | Over 3 feet |
| Surcharge | - | Permit at any height |
| Code Section | - | SDMC 129.0202 |
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 Diego FAQ
Do I need a permit for a retaining wall in San Diego?
Yes, if the wall exceeds 3 feet (footing to top) or supports any surcharge. Engineering by a licensed professional is required for permitted walls.
Can I build tiered retaining walls without a permit?
Only if each tier is under 3 feet and the tiers are spaced at least the height of the taller wall apart. Otherwise they are measured as a single wall.
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