On a project involving only framing, may a Class B General Building contractor take the prime contract and perform that trade itself?

Explanation

B&P §7057(b) says a general building contractor may take a prime contract or a subcontract for a framing or carpentry project, and that for any other project it may take the prime only where the contract requires at least two unrelated trades other than framing or carpentry, or where it holds the appropriate specialty classification. Framing alone is therefore permitted. (a) states the single-trade bar while dropping the exception the same subdivision creates. (b) invents a pre-approval procedure; classification controls, not permission. (d) stretches the exception to every trade — a roofing-only or electrical-only prime contract still needs the C classification or a licensed subcontractor.