The industry should strive more toward standardizing its costs and more precisely define what the consistent menu of deliverables should be. Different building types require differing checklists, protocols, test criteria, etc. Currently, it seems to be an open marketplace with selling options from one company to the next; a consistent and industry accepted model for reporting and deliverables does not exist.
The commissioning process is well documented in ASHRAE standards such as ANSI ASHRAE/IESStandard 202-2018, Commissioning Process for Buildings and Systems, and as better/best practices in ASHRAE Guidelines 0 and 0.1, 0.2, etc. These documents are often used as a basis for scope and costs when they are referenced in specifications, contracts and requests for proposal/quotations (RFP/RFQ).