The materials section of the new LEED v4 rating system has been completely overhauled, with a big push towards market transformation and 3rd party certifications.
The most drastic credit changes include the three new credits relating to Building Product Disclosure and Optimization:
Across these three credits, Option 1 is based on the number of products in compliance, which means a threshold of 20+ different products from at least 5+ different manufacturers must be met. This option should be targeted early for easy credit achievement.
Option 2 is cost based, which makes it more difficult to grasp compliance until all product cost is tracked and documented. However, early material vetting is required, as well as proactive product selection strategies to maximize the number of credits a product can contribute towards.