Haw. Rev. Stat. § 464-5
Nothing in this chapter shall prevent any person from engaging in engineering, architectural, or landscape architectural work and undertakings upon property owned or exclusively controlled or possessed by that person, or from hiring any person to do the work and undertakings, unless the work and undertakings involve the safety or health of the public, nor shall anything in this chapter prevent any person from engaging in land surveying upon property owned or exclusively controlled or possessed by that person or from hiring any person to do the work, unless the work involves a common boundary.
Nothing in this chapter shall be construed as applying to the business conducted in this State by any agriculturist, horticulturist, tree expert, arborist, forester, gardenshop operator, nursery operator or landscape nursery operator, gardener, landscape gardener, landscape contractor, landscape designer, landscape consultant, garden or lawn caretaker, or cultivator of land, as these terms are generally used, except that no person shall use the designation "landscape architect", "landscape architectural", or "landscape architecture" unless licensed under the provisions of this chapter.
All engineering work, architectural work, and landscape architectural work in which the public safety or health is involved shall be designed by and the construction observed by a duly licensed professional engineer, architect, or landscape architect, respectively.
HRS § 464-5