This applies to California, I don't know the requirements for MI. but they could be similar.(p.s., I don't see that a HI license is required for Michigan)
BUSINESS AND PROFESSIONS CODE - BPC
DIVISION 3. PROFESSIONS AND VOCATIONS GENERALLY [5000 - 9998.8] ( Heading of Division 3 added by Stats. 1939, Ch. 30. )
(a) Nothing in this chapter shall be construed to allow home inspectors who are not registered engineers to perform any analysis of the systems, components, or structural integrity of a dwelling that would constitute the practice of civil, electrical, or mechanical engineering, or to exempt a home inspector from Chapter 3 (commencing with Section 5500), Chapter 7 (commencing with Section 6700), Chapter 9 (commencing with Section 7000), or Chapter 14 (commencing with Section 8500) of Division 3. (b) This chapter does not apply to a registered engineer, licensed land surveyor, or licensed architect acting pursuant to his or her professional registration or license, nor does it affect the obligations of a real estate licensee or transferor under Article 1.5 (commencing with Section 1102) of Chapter 2 of Title 4 of Part 3 of Division 2 of, or Article 2 (commencing with Section 2079) of Chapter 3 of Title 6 of Part 4 of Division 3 of, the Civil Code.
(Added by Stats. 1996, Ch. 338, Sec. 2. Effective January 1, 1997.)