ISO 16346:2013规定了在建筑物（包括技术建筑系统）的能源性能证书中表达能源性能的方式，以及表达能源性能要求的方式。这包括总体数字能源性能指标和基准等级。 ISO 16346:2013还包括系统或组件级别的数字指标。 ISO 16346:2013定义了不同类型的额定值（如计算、测量、设计和定制额定值）以及需要考虑的能源用途（如供暖、制冷、生活热水、通风和照明）。 ISO 16346:2013定义 a)表示整个建筑物能源性能的总体指标，包括供暖、通风、空调、生活热水、照明系统（这包括不同的可能指标）， b)表达设计新建筑物或改造现有建筑物的能源需求的方法， c)定义参考值的程序，以及 d)设计建筑能源认证程序的方法。 此外，它提供了输送能量和建筑物能源性能指标之间的（计算）联系。由于建筑物通常使用一种以上的燃料（例如燃气和电力），因此每个能源器皿收集不同的能源。总体评级基于已交付能源产品的加权总和。权重可以与例如一次能源或CO2排放相关，以提供能源性能计算的最终结果。 它还提供了根据测量的能源使用情况评估能源性能的计算程序，包括将测量值转换为标准化条件（环境、用户）下的值的方法。最后，它定义了区分建筑能源需求、技术建筑系统、现场能源供应系统和远程能源供应系统所需的系统边界。

ISO 16346:2013 sets out ways of expressing the energy performance in an energy performance certificate of a building (including the technical building systems) and ways of expressing requirements as to the energy performance. This includes an overall numerical energy performance indicator and classes against benchmarks. ISO 16346:2013 additionally includes numerical indicators at system or component level. ISO 16346:2013 defines the different types of rating (such as calculated, measured, design, and tailored rating) and the energy uses to take into account (such as heating, cooling, domestic hot water, ventilation, and lighting). ISO 16346:2013 defines a) overall indicators to express the energy performance of whole buildings, including heating, ventilation, air conditioning, domestic hot water, and lighting systems (this includes different possible indicators), b) ways to express energy requirements for the design of new buildings or renovation of existing buildings, c) procedures to define reference values, and d) ways to design a procedure for building energy certification. Furthermore, it provides a (calculation) link between delivered energy and the energy performance indicators for buildings. Since a building generally uses more than one fuel (e.g. gas and electricity), the different energy sources are collected per energyware. The overall rating is based on a weighted sum of delivered energywares. The weightings can be related to, for instance, primary energy or CO₂ emissions to provide the end result of the calculation of energy performance. It also provides calculation procedures to assess the energy performance on the basis of measured energy use, including ways to convert the measured values to values under standardized conditions (environment, user). Finally, it defines the system boundaries needed to make a distinction between building energy needs, technical building systems, energy supply systems on site, and distant energy supply systems.