The contractor agreement usually lives outside the transaction file proper. Your TC is tracking the purchase contract, title docs, lender conditions if there is financing, and that sort of thing. The GC's own template is not something they would normally need unless your lender specifically requires an executed construction contract as a condition of the draw or the loan, which some hard money and rehab loan products do require before they release funds. That part is very lender dependent. If you are in a state like Texas where construction lien rules are stricter, you also want to make sure his agreement has the right lien waiver language baked in, because a gap there can complicate closing on the back end if you are flipping. Eight doors in, it is worth going back and actually reading that thing before demo gets much further.