When constructing a retaining wall over 4 feet high in California, which professional must seal the structural plans?
Correct Answer
C) Either a structural or civil engineer licensed in California
Per CBC Section 107.3.4 and California Business and Professions Code Section 6731, retaining walls over 4 feet in height require structural design by either a licensed civil engineer or structural engineer in California. Both professionals are qualified to design retaining walls, though structural engineers specialize in this type of work.
Why This Is the Correct Answer
Option C (Either a structural or civil engineer licensed in California) is correct per CBC Section 107.3.4 and California Business and Professions Code Section 6731. Both licensed civil engineers and licensed structural engineers are authorized to design and seal structural plans for retaining walls over 4 feet in California. The law does not require a structural engineer exclusively — a licensed civil engineer with appropriate expertise is equally qualified.
Why the Other Options Are Wrong
Option A: Civil engineer licensed in California
Option A (Civil engineer only) is partially correct but too restrictive. While a civil engineer can seal retaining wall plans, the question asks who MUST seal them — and the answer includes both civil and structural engineers. Stating 'civil engineer only' would incorrectly exclude licensed structural engineers.
Option B: Structural engineer licensed in California
Option B (Structural engineer only) is also partially correct but too restrictive. Structural engineers are certainly qualified to design retaining walls, but California law does not require a structural engineer exclusively. A licensed civil engineer may also design and seal retaining wall plans.
Option D: Licensed architect
Option D (Licensed architect) is incorrect. While architects may design buildings that include retaining walls as part of an overall project, they are not independently authorized to seal structural engineering plans for retaining walls. Retaining walls are structural elements requiring a licensed civil or structural engineer's seal.
Memory Technique
Remember: '4 feet = engineer required, either PE or SE.' Think of it as a 4-foot fence dividing the world of licensed design from unlicensed work. Above that fence, you need a California-licensed engineer — civil OR structural. Architects and contractors alone cannot seal these plans.
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