Retaining Walls: Bostonia vs San Diego
How do retaining walls rules compare between Bostonia, CA and San Diego, CA?
Bostonia and San Diego have similar restriction levels.
Bostonia, CA
San Diego County
Retaining walls over 3 feet in height (measured from top of footing to top of wall) require a building permit in unincorporated San Diego County. Walls supporting a surcharge (additional weight or structures above) also require permits regardless of height.
View full Bostonia 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 | Bostonia | San Diego |
|---|---|---|
| Permit Threshold | Over 3 ft from footing to top | Over 3 feet |
| Surcharge | Any wall with weight above needs permit | Permit at any height |
| Engineering Required | Walls over 4 ft exposed height | - |
| Drainage | Required behind all retaining walls | Weep holes or drain tile |
| Authority | County PDS Building Division | - |
| Engineering | - | Required over 3 ft |
| Code Section | - | SDMC 129.0202 |
Highlighted rows indicate differences between cities.
Bostonia FAQ
Do I need a permit for a retaining wall in unincorporated San Diego County?
Yes, if the wall exceeds 3 feet from the top of the footing to the top of the wall, or if it supports any surcharge (weight, fill, or structures above it). Walls over 4 feet of exposed height require professional engineering.
What is a surcharge in retaining wall terms?
A surcharge is any weight or pressure behind the wall, such as fill material, a slope, a driveway, a building, or a fence on top. Even short walls need permits if they support a surcharge.
Can I build a short retaining wall without a permit?
Retaining walls 3 feet or less that do not support any surcharge generally do not require a permit. However, proper drainage must still be installed behind the wall.
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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