Whether planning a new campus, a new building, or renovating facilities, key questions arise: How large should the project be, what will it cost, and is it better to build new or renovate? Todd Griffith and Alex Wing, drawing from three case studies – a campus relocation, a utilization study of research resources, and a campus-wide laboratory space evaluation -- share best practices for determining the optimum project size for diverse campus contexts. Their process -- integrating evaluation data, programming priorities, and space utilization trends – will guide campus planners in estimating future needs and making better decisions, ensuring projects stay within budget and meet diverse campus requirements.