The owner’s goals and IPMVPguidelines should drive the M&V plan, which should specify the systems to be submetered, those to be spot-metered, and how this will be accomplished.
Coordinate with your mechanical and electrical engineers to verify that the control devices will be able to provide the information needed for credit compliance.
Require that your contractor submit an IAQ Management Plan early in construction, before interior work has begun. The plan should detail the approach to this credit, as well as IEQc3.1 if both credits are being pursued.
The contractor is the signatory for IEQc5, even though it's a design credit. Have the contractor review 100% of the construction documents to confirm compliance before completing the design submittal. Otherwise, the credit may have to be deferred until the construction submittal.