Building defects affect society at large due to possible danger posed; they also result in direct and indirect cost in repairs, abnormally high maintenance, disputes and possible loss of building use.

Defects are generally caused by inadequacies in design, poor workmanship, building usage not in accordance with design and lack of or incorrect maintenance. Dampness and Cracks are common manifestations of defects. Dampness can however often lead to Cracks, making it difficult to determine root cause and appropriate repair. Not all manifestations may be considered defects and not all defects are serious to the extent that it will affect building stability and occupant safety. Materials are often blamed for defects when the cause lies in the choice of unsuitable materials and/or when their limitations are recognised and taken into account in design and design detailing.

A new Dutch standard NEN 2767, believed to be a world-first in Building Condition Assessment attempts to provide insight and uniformity in defect assessment and classification, translating the diagnosis in condition scores. The standard is expected to contribute towards improving communications for all involved including litigations relating to defects.