The Scottish Government Health & Social Care Directorate has invested £250 million in primary healthcare buildings through the Hub Programme, with the aim of delivering value for money. To achieve this, the development of performance metrics is crucial. The Health Reference Design provides a cost and area metric that supports performance measurement, consistency, and best practice. The performance metrics are based on the principles of improving value for money, and they are designed to cover a variety of aspects of the Hub Programme, including cost, quality, and efficiency. The report provides an overview of the performance metrics and the lessons learned from previous reports.