Retaining Walls: Lincoln vs Rocklin
How do retaining walls rules compare between Lincoln, CA and Rocklin, CA?
Lincoln and Rocklin have similar restriction levels.
Lincoln, CA
Placer County
Under the California Building Code adopted by Lincoln Municipal Code Title 15, retaining walls over 4 feet measured from the bottom of the footing to the top of the wall, or any retaining wall supporting a surcharge such as a driveway, slope, or structure, require a building permit and engineered drawings from the City of Lincoln Building Division.
View full Lincoln rules →Rocklin, CA
Placer County
Rocklin follows the California Building Code (adopted by RMC Title 15): retaining walls more than 4 feet tall measured from the bottom of the footing to the top, or any retaining wall supporting a surcharge (driveway, structure), require a building permit. Combined retaining-wall-plus-fence height still counts against the 6-foot RMC 17.76 zoning cap.
View full Rocklin rules →Key Facts Comparison
| Fact | Lincoln | Rocklin |
|---|---|---|
| Permit threshold | Over 4 feet (footing to top) or any wall with surcharge | Over 4 ft (footing to top) or any surcharge |
| Code basis | California Building Code section 105.2 (via LMC Title 15) | - |
| Engineering | Required for permitted walls | Required for permit-triggering walls |
| Submit to | Lincoln Permit Center, 600 6th Street | - |
| Code reference | - | CBC §105.2 via RMC Title 15 |
| Fence-on-wall height | - | Counted toward RMC 17.76 zoning cap |
| Permit contact | - | Rocklin Building Division (916) 625-5160 |
Highlighted rows indicate differences between cities.
Lincoln FAQ
Do I need a permit for a 3-foot landscape retaining wall?
Not if it is 4 feet or less measured from the bottom of the footing to the top of the wall AND it is not supporting a surcharge (no slope, driveway, or structure pushing on it). A wall holding back even a moderate slope can still need a permit.
What if my retaining wall holds up my driveway?
Then it is 'supporting a surcharge' and requires a building permit and engineered plans regardless of height, per the California Building Code adopted under Lincoln Municipal Code Title 15.
Rocklin FAQ
Do I need a permit for a 3-foot rockery in my Rocklin backyard?
Generally no — CBC §105.2 exempts retaining walls 4 feet or less (footing to top) without a surcharge from a building permit, but the wall must still be properly drained and meet setback/property-line rules.
I want a 4-foot retaining wall plus a 6-foot fence on top. Is that allowed?
The 6-foot fence is measured from the higher finished grade once the wall supports a real grade change, so it can be allowed in a side/rear yard. The retaining wall itself needs a permit because it is over 4 feet or supports a surcharge. Confirm with the Rocklin Building Division before construction.
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