Retaining Walls: Oakley vs Pittsburg
How do retaining walls rules compare between Oakley, CA and Pittsburg, CA?
Oakley and Pittsburg 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 →Pittsburg, CA
Contra Costa County
Retaining walls in Pittsburg over 4 feet in height (measured from bottom of footing to top of wall) or supporting a surcharge require a building permit and engineered design under California Building Code Section 105. Walls under 4 feet and not supporting surcharge are typically exempt.
View full Pittsburg rules →Key Facts Comparison
| Fact | Oakley | Pittsburg |
|---|---|---|
| Retaining wall exemption | Up to 3 feet | - |
| Combined fence + wall | 7 feet total, wall ≤ 3 ft | - |
| Code Section | Ord. Code 72-6.202 | - |
| Permit threshold | - | Over 4 ft OR any surcharge |
| Engineering | - | Required for permit walls |
| Drainage | - | Required behind wall |
| Fence on wall | - | Combined height restrictions |
| Enforcement | - | Pittsburg Building Division |
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.
Pittsburg FAQ
Can I build a 3-foot landscape wall without a permit?
Yes if it is under 4 feet from footing to top and does not support a surcharge (driveway, sloped fill, structure). Always verify with the Building Division before starting.
Does a 6-foot fence on top of a retaining wall count as one combined structure?
For sight triangle and some setback purposes combined height matters. The building permit for the retaining wall and the fence are separate reviews. Consult Planning for your specific parcel.
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