Buildings account for the largest share of accumulated materials and waste. Tracking material composition, quantity, and location of these materials, known as building material stock analysis (MSA), is a first step enabling the reuse or repurposing of materials, key strategies of the circular economy. While the number of building MSAs is growing, there is a need to coalesce methods, data, and scope. Therefore, in this work, we reviewed and evaluated 62 journal and conference articles on MSA of buildings from different angles including scope, boundaries, archetype classification, material intensity determination, approaches (i.e., bottom-up, top-down, remote sensing), and quantity of materials to identify barriers, gaps, and opportunities of the area along with its implications on decision making, policy, and regulations. We cataloged the three major approaches of MSAs and discussed their advantages and shortcomings. We also created a comprehensive directory of building archetypes, references, and materials for future researchers. Most of the studies expectedly estimated that concrete had the largest mass compared to other materials; however, mass-based distribution of materials showed significant variations in different building stocks across the world. Also, embedded plastics and their types remained under-represented in current studies. A major barrier to MSA is related to lack of physical attributes, GIS, design, and construction data. Policy makers can play a role in mitigating data barriers through instituting regulations, which enforce reporting building-related data during permitting process. Furthermore, outcomes of building MSA can help policy makers in considering incentives for design and construction that utilize these abundant building materials.