Retaining Walls: Vacaville vs Vallejo
How do retaining walls rules compare between Vacaville, CA and Vallejo, CA?
Vacaville and Vallejo have similar restriction levels.
Vacaville, CA
Solano County
In unincorporated Solano County, retaining walls not over 4 feet in height, measured from the bottom of the footing to the top of the wall, are exempt from a building permit, unless the wall supports a surcharge or impounds liquids. Taller or loaded walls require a building permit.
View full Vacaville rules →Vallejo, CA
Solano County
Vallejo requires permits for retaining walls above a certain height, typically 4 feet. Engineering review may be required for taller walls.
View full Vallejo rules →Key Facts Comparison
| Fact | Vacaville | Vallejo |
|---|---|---|
| Permit-Exempt Height | 4 feet or less (bottom of footing to top) | - |
| Always Needs Permit | Walls supporting a surcharge | - |
| Also Needs Permit | Walls impounding liquids | - |
| Measurement Point | Bottom of footing, not grade | - |
| Permit Authority | Solano County Building & Safety Services | - |
| Permit Free | - | Up to 4 feet typically |
| Engineering | - | Required over 4 feet |
| Setbacks | - | Apply near property lines |
| Drainage | - | Must be addressed |
Highlighted rows indicate differences between cities.
Vacaville FAQ
How tall can a retaining wall be without a permit in Solano County?
Up to 4 feet, measured from the bottom of the footing to the top of the wall - but only if it does not support a surcharge or impound liquids. Otherwise a building permit is required.
Why does the footing matter for the 4-foot rule?
Because the County measures from the bottom of the footing, not from ground level. A wall that looks under 4 feet above grade can still exceed the limit once the buried footing is included.
What is a 'surcharge'?
A surcharge is an added load above the wall, such as a slope, building, or driveway. A retaining wall supporting a surcharge requires a building permit at any height.
Vallejo FAQ
Do I need a permit for a retaining wall?
In Vallejo, walls over 4 feet typically require a building permit and engineered plans. Shorter walls may be exempt.
How close to the property line can I build a retaining wall?
Setback requirements vary. Check Vallejo zoning code for specific distances from property lines.
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