The construction sector plays a vital role in global energy consumption, with buildings accounting for a significant portion of energy usage and greenhouse gas emissions. To address this challenge, there is a growing focus on constructing and renovating buildings to enhance energy efficiency, aiming to mitigate environmental impacts and lower operational costs. Energy efficiency requirements embedded within building codes and distinct energy standards are pivotal in integrating energy efficiency considerations during the design phase of new buildings. This paper examines the evolution of energy efficiency mandates in building construction regulations and standards, analyzing their adoption and enforcement across national, regional, and international levels. Case studies, such as Denmark's early implementation of building codes to govern energy usage, highlight the effectiveness of stringent efficiency standards in curbing energy consumption over time. Additionally, the paper delves into the emerging trend of international collaboration to develop unified energy efficiency standards, demonstrated by initiatives like the European Energy Performance in Buildings Directive and US-based Energy Efficiency standards. Through a comprehensive analysis of these developments, the paper underscores the significance of energy efficiency regulations in fostering sustainable building practices and discusses the implications of diverse regulatory approaches for achieving energy efficiency objectives.