The IGCC is not a rating system, but an enforceable code which will require minimum mandatory requirements based on the following areas of construction:
- Energy Use Conservation/Efficiency
- Water Use Conservation/Efficiency
- Indoor Environment Quality
- Materials & Resource Conservation
- Jurisdictional Requirements
- Project Electives - Designers Choice
- Existing Buildings & Sites
- Commissioning, Operation & Maintenance
By setting a "floor" through enforcing mandatory minimums, the hope is that it will create an opportunity for optional certification programs such as LEED to push the "ceiling" higher and reward buildings that reach greater levels of performance.
The IGCC is the first significant step toward creating universal green construction standards, but still requires local governments to voluntarily adopt the code. It will be interesting to see how the program is adopted throughout 2012.