1.1本规程建立了一个程序，用于评估建筑物或建筑系统的寿命周期成本（LCC），并比较满足相同功能要求的替代建筑物设计或系统的寿命周期成本。 1.2 LCC法以现值或年价值衡量在指定时间段内拥有和运营建筑物或建筑系统的所有相关成本之和。 1.3 LCC方法的基本前提是，对于投资者或决策者而言，投资决策产生的所有成本对该决策具有潜在重要性，包括未来成本和当前成本。 适用于建筑物或建筑系统，LCC包括指定研究期内的所有相关成本，包括设计、采购/租赁、建造/安装、运营、维护、维修、更换和处置特定建筑物设计或系统的成本。 ====意义和用途====== LCC分析是在指定研究期间评估项目或项目备选方案的一种经济方法。该方法需要计算具有相同目的的替代建筑设计或系统规范的LCC，然后对其进行比较，以确定在研究期间哪个LCC最低。 当与初始成本较低但未来成本较高的替代方案相比时，LCC方法特别适用于确定建筑物或建筑系统的较高初始成本是否通过降低未来成本（例如，运营、维护、维修或更换成本）而具有经济合理性。如果与备选方案相比，建筑设计或系统规范具有较低的初始成本和较低的未来成本，则无需进行LCC分析以表明前者是经济上更可取的选择。 如果投资项目对建筑运营不是必不可少的（例如，更换现有的- 窗格窗口和新的双窗格窗口），必须将项目与 “ 什么都不做 ” 备选方案（即保持单窗格窗口），以确定其是否具有成本效益。通常 “ 什么都不做 ” 备选方案不需要初始投资成本，但未来成本高于拟议项目。

1.1 This practice establishes a procedure for evaluating the life-cycle cost (LCC) of a building or building system and comparing the LCCs of alternative building designs or systems that satisfy the same functional requirements. 1.2 The LCC method measures, in present-value or annual-value terms, the sum of all relevant costs associated with owning and operating a building or building system over a specified time period. 1.3 The basic premise of the LCC method is that to an investor or decision maker all costs arising from an investment decision are potentially important to that decision, including future as well as present costs. Applied to buildings or building systems, the LCC encompasses all relevant costs over a designated study period, including the costs of designing, purchasing/leasing, constructing/installing, operating, maintaining, repairing, replacing, and disposing of a particular building design or system. ====== Significance And Use ====== LCC analysis is an economic method for evaluating a project or project alternatives over a designated study period. The method entails computing the LCC for alternative building designs or system specifications having the same purpose and then comparing them to determine which has the lowest LCC over the study period. The LCC method is particularly suitable for determining whether the higher initial cost of a building or building system is economically justified by reductions in future costs (for example, operating, maintenance, repair, or replacement costs) when compared with an alternative that has a lower initial cost but higher future costs. If a building design or system specification has both a lower initial cost and lower future costs relative to an alternative, an LCC analysis is not needed to show that the former is the economically preferable choice. If an investment project is not essential to the building operation (for example, replacement of existing single-pane windows with new double-pane windows), the project must be compared against the “ do nothing ” alternative (that is, keeping the single pane windows) in order to determine if it is cost effective. Typically the “ do nothing ” alternative entails no initial investment cost but has higher future costs than the proposed project.