Retaining Walls: Oakley vs Richmond
How do retaining walls rules compare between Oakley, CA and Richmond, CA?
Oakley and Richmond have similar restriction levels.
Oakley, CA
Contra Costa County
Retaining walls up to 3 feet (measured footing to top) are exempt from building permits in unincorporated Contra Costa County. Combined with a fence, the total height may not exceed 7 feet, and the wall portion may not exceed 3 feet.
View full Oakley rules →Richmond, CA
Contra Costa County
Retaining walls up to 4 feet in exposed height (measured from the bottom of the footing to the top of the wall) do not require a building permit in Richmond unless they support a surcharge. Walls over 4 feet, or any height if supporting a surcharge, require engineered design and a permit. Drainage is required behind all walls.
View full Richmond rules →Key Facts Comparison
| Fact | Oakley | Richmond |
|---|---|---|
| Retaining wall exemption | Up to 3 feet | - |
| Combined fence + wall | 7 feet total, wall ≤ 3 ft | - |
| Code Section | Ord. Code 72-6.202 | - |
| - | - |
Highlighted rows indicate differences between cities.
Oakley FAQ
Can I stack a fence on top of a 3-foot retaining wall?
Yes, as long as the combined height of the wall and fence does not exceed 7 feet and the wall portion stays at or under 3 feet. This combined structure may be placed within required yard setbacks without planning approval.
When does a retaining wall need an engineered permit?
Whenever it exceeds 3 feet from footing to top, supports a surcharge (such as a driveway or sloped backfill steeper than 1:2), or impounds Class I, II, or III-a liquids.
Richmond FAQ
Do I need a permit for a 3-foot landscape wall?
Usually no, provided it doesn't support a driveway, pool, or significant upslope. Check with Richmond Building if in doubt.
Can I build a retaining wall right on the property line?
Generally yes up to 4 feet, but footing design must not encroach on neighbor property. Over 4 feet may require setbacks or neighbor easement.
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