If there is not an exterior Work on envelope but there is a core MEP alteration ,could a project be certified as a NC LEED Project (or C&S)? According to the rating system selection guidance it seems to me that a major renovation must imply an exterior shell modification, isn´t it? Or you only will lost the asociated credits and ignore the prerequisites requirements if there is something mandatory?

Does the modification of the existing interior louvers or draperires, could be considered as envelope work ?