It simply exempts such owners when they do the work themselves or supervise others in doing the construction. Contrary to your assumption, under Mont. Code Ann. Mont. Code Ann. These sections grant the Board the authority to interpret the statutes which they are to enforce through either rulemaking or the contested case process. Such rules and decisions are given deference by the courts.
Agencies frequently construe the statutes they are charged with enforcing or administering.
Such statutory construction is not the sole province of the courts or of this office.