The extension period is too long. It's TWO year from now. Why does the industry need so much time? LEED V4 already took several years, with several public reviews, to develop. It's been online for a full year. It's not new, really. And, it's not dramatically different than V3, in terms of LEED "mechanics". Its changes are primarily moving/bundling/renaming credits and increased stringency.

That said, its emphasis on Transparency & Disclosure in the MR credits is a significant improvement. And a challenge. To accelerate the adoption of LEED V4, I believe the USGBC should focus on the construction materials manufacturing and supply chains. I see these industries struggling with providing compliant, documented products. And many are hesitating... Do you recall about a dozen years ago when contractors would jack-up their bids to supply FSC wood? This wasn't because the material cost that much more. It was an availability issue. The USGBC could significantly gain market acceptance by helping manufacturers understand the MR credits, especially what they need to do to provide compliant products. Does anyone know whether the USGBC has any such programs or initiatives in place to help these industries? I feel this, more than a time extension, would accelerate LEED V4 acceptance.