Pierre, I sorted this out, the OSHA GFCI rule is 1926.404(b)(1)(ii)
"Ground-fault circuit interrupters. All 120-volt, single-phase 15- and 20-ampere receptacle outlets on construction sites, which are not a part of the permanent wiring of the building or structure and which are in use by employees, shall have approved ground-fault circuit interrupters for personnel protection ..."
The operative words are "not part of the building wiring". Once they power up the receptacles in the house the trades can use them without GFCIs.
