Adequate risk assessment for vibration is hampered by the lack of published damage levels for museum objects. The opportunity to study levels of vibration that cause damage to objects was presented by a major building project, The Great Court at the British Museum. The measured damaging vibration levels were between 0.2 and 0.6 g. The results of measured vibration caused by circulation in the British Museum are assessed in terms of these measured damage levels. When assessing the likely impact of building work, vibration transmission through structures to areas remote from the building work must be considered. Examples of damage to individual objects and vibration transmission are discussed. -- SCMRE