ISO 16346:2013定义了评估建筑（包括技术建筑系统）能源性能的一般程序，并定义了不同类型的额定值和建筑边界。 ISO 16346:2013的目的是 a） 整理计算建筑物内特定服务的能源使用的其他国际标准的结果， b） 考虑建筑产生的能源，其中一些可能会出口到其他地方使用， c） 以表格形式呈现建筑物的总体能源使用情况， d） 根据一次能源、二氧化碳排放或国家能源政策规定的其他参数提供能源评级，以及 e） 建立计算一次能源系数和二氧化碳排放系数的一般原则。 ISO 16346:2013定义了为规划和现有建筑设定能源性能等级时应考虑的能源服务，并规定 1） 计算标准计算能量额定值的方法，不取决于乘员行为、实际天气和其他实际（环境或室内）条件的标准能量使用， 2） 根据输送和输出的能量，评估测量的能量等级的方法， 3） 通过与实际能耗进行比较，提高建筑计算模型可信度的方法，以及 4） 评估可能改进的能源效率的方法。 ISO 16346:2013适用于建筑物的一部分（例如:。 g、 一整栋楼，或几栋楼。

ISO 16346:2013 defines the general procedures to assess the energy performance of buildings, including technical building systems, and defines the different types of ratings, and the building boundaries. The purpose of ISO 16346:2013 is to a) collate results from other International Standards that calculate energy use for specific services within a building, b) account for energy generated in the building, some of which may be exported for use elsewhere, c) present a summary of the overall energy use of the building in tabular form, d) provide energy ratings based on primary energy, carbon dioxide emission, or other parameters defined by a national energy policy, and e) establish general principles for the calculation of primary energy factors and carbon dioxide emission coefficients. ISO 16346:2013 defines the energy services to be taken into account for setting energy performance ratings for planned and existing buildings and provides for 1) a method to compute the standard calculated energy rating, a standard energy use that does not depend on occupant behaviour, actual weather, and other actual (environment or indoor) conditions, 2) a method to assess the measured energy rating, based on the delivered and exported energy, 3) a method to improve confidence in the building calculation model by comparison with actual energy use, and 4) a method to assess the energy effectiveness of possible improvements. ISO 16346:2013 is applicable to a part of a building (e.g. flat), a whole building, or several buildings.