Over the years, numerous studies have shown that the submetering of utilities is one of the most effective ways to reduce consumption in multifamily properties. Submetering a master-metered building is unlike virtually any other energy conservation measure that can be undertaken by a building owner. Submetering as a conservation measure enlists both management and residents in the effort and generally produces a conservation savings of 20 to 40%. With advancements made over the past years, there now exists a wide range of technologies available to accomplish submetering for water, gas or electric for almost every property configuration. A typical submetering system consists of a meter to measure usage of a specific utility for each unit and a wireless system to transmit the data to a central computer to allow for remote reading. A third party billing company is normally used to read the meter data and format a bill that is sent to the tenants. What follows is an overview of available technology for the submetering of water, electricity and gas. These techniques can be used on new construction or existing (retrofit) buildings. A brief description of a typical wireless system is also included. Please note that submetering rules vary from state to state so it is best to check with your preferred billing company before beginning.