The “practice of residential design” consists of rendering services embracing the scientific, esthetic or orderly coordination of processes which enter into:
1. The production of a completed:
(a) Single-family dwelling unit; or
(b) Multifamily dwelling structure that does not exceed two stories in height and is composed of not more than four units in that structure; and
2. The use of space within and surrounding the unit or structure,
Ê performed through the medium of plans, specifications, administration of construction, preliminary studies, consultations, evaluations, investigations, contract documents, and advice and direction.