Cal. Bus. & Prof. Code § 5641

This chapter shall not be deemed to prohibit any person from preparing drawings for the conceptual design and placement of tangible objects and landscape features or plans, drawings, and specifications for the selection, placement, or use of plants for a single family dwelling. Construction documents, details, or specifications for the tangible objects or landscape features, and alteration of site requiring grading and drainage plans shall be prepared by a licensed professional as required by law.