Retaining Walls: Fullerton vs Midway City
How do retaining walls rules compare between Fullerton, CA and Midway City, CA?
Fullerton has fewer restrictions than Midway City.
Fullerton, CA
Orange County
Fullerton requires building permits for retaining walls over 4 feet in height (measured from the bottom of the footing to the top of the wall). Walls over 4 feet also require engineered plans. Retaining walls combined with fences have combined height limits.
View full Fullerton rules →Midway City, CA
Orange County
Retaining walls in unincorporated Orange County require building permits and engineered plans when retaining level earth over 4 feet, retaining any slope, or subject to surcharge loads. The OC Grading Manual and Building Code govern design and construction standards.
View full Midway City rules →Key Facts Comparison
| Fact | Fullerton | Midway City |
|---|---|---|
| Permit Threshold | Required for walls over 4 ft | Over 4 feet (level earth) |
| Engineering | Licensed engineer plans for 4+ ft | - |
| Fence on Wall | Combined height limits apply | - |
| Hillside Areas | May need geotechnical report | - |
| Permits | Building Division — (714) 738-6837 | - |
| Engineering Required | - | Licensed PE or architect |
| Slope Retention | - | Always requires permit |
| Reference | - | OC Grading Manual (2017) |
Highlighted rows indicate differences between cities.
Fullerton FAQ
Do I need a permit for a retaining wall in Fullerton?
Retaining walls over 4 feet in height (from footing to top) require a building permit and engineered plans. Walls 4 feet or under may be exempt if they do not retain a surcharge.
Can I put a fence on top of a retaining wall in Fullerton?
Yes, but the combined height of the retaining wall and fence is measured from the lower finished grade and must comply with zoning district fence height limits.
Do hillside retaining walls have extra requirements?
Yes. Retaining walls in hillside areas of northern Fullerton may require geotechnical investigations and drainage plans in addition to standard building permits.
Midway City FAQ
Do I need a permit for a retaining wall in unincorporated Orange County?
Yes, if the wall retains level earth over 4 feet, retains any slope, or is subject to surcharge loads. Engineering by a licensed professional is required and plans must be signed.
Can I build a short retaining wall without a permit?
Retaining walls under 4 feet retaining level earth without surcharge are generally exempt from permits. However, they must still comply with property setback requirements and proper drainage.
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