Living Building Challenge (LBC) The Living Building Challenge (LBC) is a rigorous and transformative green building certification program which strives for netzero or net-positive energy, water, and waste. About LBC The LBC provides a sustainable framework for developing restorative built environments which mimic natural design. At ASSA ABLOY, we value integrative sustainable design principles and understand the importance of optimizing building performance while reducing environmental impact. The latest version of the LBC standard, LBC v3.1, consists of seven performance categories, or “Petals,” which are subdivided into a total of twenty mandatory imperatives. ASSA ABLOY works directly with consumers to meet LBC v3.1 standards, providing clear and concise documentation illustrating our respective contributions.