A letter from the U.S. General Services Administration on 25 October 2013 has leveled the playing field for rating systems in the U.S. The letter, addressed to the Secretary of Energy makes six new recommendations for the Federal government's use of green building certification systems. The recommendations were developed after an evaluation of existing systems carried out by Pacific Northwest National Laboratory (PNNL), and were followed by input from advisory groups.
In brief, the recommendations include the following:
1. Agencies should continue to use third-party certification systems;