The survey aimed to assess the extent of historic plaster containing animal hair in a three-storey listed building. The focus was on external walls of the Saloon and Boudoir rooms on the ground floor, which had suffered water ingress, damaging the internal plaster. Our methodology included a comprehensive visual inspection of accessible areas and sampling of suspected animal hair plaster for microbiological analysis. Despite limited access to certain areas, we assumed non-accessible sections might contain historic animal hair plaster. Samples were analysed by the UKAS accredited Rare and Imported Pathogens Laboratory. The results showed no presence of historic plaster with animal hair, and Bacillus Anthracis was not detected in any samples. Therefore, no further actions are required concerning historic plaster in this property. All health and safety measures were strictly followed, ensuring minimal risk to occupants and visitors.