Retaining Walls: Petaluma vs Santa Rosa
How do retaining walls rules compare between Petaluma, CA and Santa Rosa, CA?
Petaluma and Santa Rosa have similar restriction levels.
Petaluma, CA
Sonoma County
In unincorporated Sonoma County, a retaining wall is exempt from a building permit only if it retains 3 feet or less of material and does not support a surcharge or impound class I, II, or IIIA liquids; taller or surcharged walls require a building permit from Permit Sonoma.
View full Petaluma rules →Santa Rosa, CA
Sonoma County
In unincorporated Sonoma County, a retaining wall is exempt from a building permit only if it retains 3 feet or less of material and does not support a surcharge or impound class I, II, or IIIA liquids; taller or surcharged walls require a building permit from Permit Sonoma.
View full Santa Rosa rules →Key Facts Comparison
| Fact | Petaluma | Santa Rosa |
|---|---|---|
| Permit exemption | Retaining walls retaining not more than 3 feet of material are exempt from a building permit, unless supporting a surcharge or impounding class I, II, or IIIA liquids (BPC-005) | Retaining walls retaining not more than 3 feet of material are exempt from a building permit, unless supporting a surcharge or impounding class I, II, or IIIA liquids (BPC-005) |
| Permit trigger | Walls retaining more than 3 feet of material, or any wall supporting a surcharge, need a building permit from Permit Sonoma | Walls retaining more than 3 feet of material, or any wall supporting a surcharge, need a building permit from Permit Sonoma |
| Other approvals | Building-permit exemption does not waive use permits, design review, or coastal permits that may otherwise apply | Building-permit exemption does not waive use permits, design review, or coastal permits that may otherwise apply |
| Who to contact | Permit Sonoma (Sonoma County's consolidated permitting agency), (707) 565-1900, PermitSonoma@sonomacounty.gov | Permit Sonoma (Sonoma County's consolidated permitting agency), (707) 565-1900, PermitSonoma@sonomacounty.gov |
Highlighted rows indicate differences between cities.
Petaluma FAQ
Do I need a permit for a retaining wall in unincorporated Sonoma County?
Not if the wall retains 3 feet or less of material and does not support a surcharge or impound class I, II, or IIIA liquids. If it retains more than 3 feet of material, or supports any surcharge such as a slope or structure above it, you must obtain a building permit from Permit Sonoma.
How is the 3-foot retaining wall exemption measured?
Permit Sonoma's BPC-005 frames the exemption in terms of the depth of material retained, not the overall height of the wall, and the exemption is lost entirely if the wall supports a surcharge or impounds class I, II, or IIIA liquids.
Does an exempt retaining wall still need other county approvals?
Possibly. Permit Sonoma advises that work exempt from a building permit may still require other permits or approvals, such as use permits, design review, or coastal permits, depending on the property's zoning and location.
Santa Rosa FAQ
Do I need a permit for a retaining wall in unincorporated Sonoma County?
Not if the wall retains 3 feet or less of material and does not support a surcharge or impound class I, II, or IIIA liquids. If it retains more than 3 feet of material, or supports any surcharge such as a slope or structure above it, you must obtain a building permit from Permit Sonoma.
How is the 3-foot retaining wall exemption measured?
Permit Sonoma's BPC-005 frames the exemption in terms of the depth of material retained, not the overall height of the wall, and the exemption is lost entirely if the wall supports a surcharge or impounds class I, II, or IIIA liquids.
Does an exempt retaining wall still need other county approvals?
Possibly. Permit Sonoma advises that work exempt from a building permit may still require other permits or approvals, such as use permits, design review, or coastal permits, depending on the property's zoning and location.
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