Whole building assessment

IMPACT uses a whole-building assessment method involving the detailed measurement of each constituent product/material/component. When used in conjunction with operational energy and water consumption tools (such as within IES-VE or eTool) the interplay between the initial construction and operational impacts can be analysed to optimise the design.

This approach is in line with the European Committee for Standardization CEN/TC 350 (sustainable assessment of buildings) conclusion that LCA and LCC should both be included in whole-building assessment. The benefit of whole building assessment is that the performance is based on comparing a whole building design to another whole building design, instead of, for example, comparing an external wall design to another external wall design (and then, separately, comparing roofs then windows etc.). Assessment at the building level means that only the building’s high-level function (such as office or residential) must be defined. The variable functions of the constituent elements may differ according to building-specific design requirements.