When Fundemental Commissioning Should start

Technically your project could likely still pursue LEED assuming you meet all the other prerequisites. These are statements in the NC reference guide that are related to your question: "Although EA Prerequisite 1 does not require the CxA to be on the project team until just before the equipment installation phase, if brought in earlier, he or she can also help the owner develop the project requirements and assist with other important commissioning tasks." You will however still need to have created a Commissioning Spec and a BOD : "Develop and incorporate commissioning requirements into the construction documents." "The design team must document the basis of design for the systems to be commissioned prior to approval of contractor submittals of any commissioned equipment or systems."