This document provides information about a BfL12 training session held in Bristol on February 27th, 2013. It discusses the remodelling of the Building for Life (BfL) assessment tool to version 12, including rationalizing it down to 12 questions to make it more accessible and shift the focus to design dialogue rather than assessment. Key goals of the remodelling were to secure industry support while adding value. The training session outlines the underlying principles and goals of BfL12, explains the 12 questions and how the process works, and provides an example case study of a development in Derby that used BfL12.