More specifically, building diagnostics are holistic process of data collection methods and techniques regarding inspection and analysis, and of prediction[1] of faults/abnormality/defects in the condition, internal environment and performance of a building or structure, extending to services offered in the building.
[2] The three main types include commissioning, monitoring, and investigation diagnostics.
This process can be carried out unaided (using naked eye) but often aided by advanced technology such as infrared thermography, ultrasound, radar, vibration, and lasers.
As part of a property condition assessment or home inspection building diagnostics is not an exact science and is subjective.
It is important that this final judgment can only be made after careful diagnostic process has been properly performed.