ISO 15686-5:2017提供了对建筑物和建造资产及其部件（无论是新的还是现有的）进行生命周期成本（LCC）分析的要求和指南。 注1:生命周期成本计算考虑了从收购到运营再到处置的成本或现金流，即相关成本（以及收入和外部性，如果包括在约定范围内）。 注2:生命周期成本计算通常包括备选方案之间的比较，或投资组合、项目或组件层面的未来成本估算。生命周期成本计算是在约定的分析期内进行的，明确确定分析是仅针对已建资产的一部分还是整个生命周期。

ISO 15686-5:2017 provides requirements and guidelines for performing life-cycle cost (LCC) analyses of buildings and constructed assets and their parts, whether new or existing. NOTE 1 Life-cycle costing takes into account cost or cash flows, i.e. relevant costs (and income and externalities if included in the agreed scope) arising from acquisition through operation to disposal. NOTE 2 Life-cycle costing typically includes a comparison between alternatives or an estimate of future costs at portfolio, project or component level. Life-cycle costing is performed over an agreed period of analysis, clearly identifying whether the analysis is for only part of or for the entire life cycle of the constructed asset.