As the LEED Reference Guide states, the accuracy and cost of an M&V program is influenced by:The level of detail and effort associated with verifying post-construction conditionsThe number and type of metering pointsThe duration and accuracy of meteri

As the LEED Reference Guide states, the accuracy and cost of an M&V program is influenced by:

The level of detail and effort associated with verifying post-construction conditions
The number and type of metering points
The duration and accuracy of metering activities
The number and complexity of dependent and independent variables that must be measured or determined on an ongoing basis
The availability of existing data collection systems (e.g., energy management systems)
The confidence and precision levels for the analyses.

The highest return on investment for an M&V program occurs when the system operates over the life of the building. 

The highest return on investment for an M&V program occurs when the system operates over the life of the building. While the credit does not require a specific duration of the M&V effort, at least one year post occupancy is recommended.

An M&V program generally includes both sensors—which measure the energy volume and rate of flow, watts of energy draw, temperature, length of time, and other variables—and a central processor, which stores the collected information and helps building

An M&V program generally includes both sensors—which measure the energy volume and rate of flow, watts of energy draw, temperature, length of time, and other variables—and a central processor, which stores the collected information and helps building managers interpret it. A BMS typically includes the central processor needed for M&V, but not all of the sensors or additional programming to tally energy use and track patterns. However, adding these pieces to a BMS should pose little difficulty.