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This document (EN 17887-1:2024) has been prepared by Technical Committee CEN/TC 89 "Thermal performance of buildings and building components", the secretariat of which is held by SIS. This document specifies a test method for the in-situ measurement of the thermal performance of buildings, both newly built and existing. This document specifies the data to be collected during and after the test. This document is applicable to domestic scale detached buildings and attached domestic scale buildings, such as semi-detached houses, terraced houses and apartments. Specially constructed test samples representing single construction elements are outside the scope of this document