RAH Consultancy were approached by a householder in Mexborough Yorkshire with regard to the freezing of the water system within his property. This occurred during the freezing weather in 2010 whilst the occupant was away on holiday.The household is fitted with a fire sprinkler system protecting the ground floor of the property that was designed and installed by a company specialising in sprinkler installations. This system had burst which had resulted in considerable water damage to the residence. We were asked to inspect and comment upon the design and installation of this system with particular regard to frost protection.We attended at the property and prepared a report which considered the information contained within BS 9251:2005 "Sprinkler systems for residential and domestic occupancies - Code of Practice."The report concentrated on the requirements and obligations for the design and installation of the system and the failures of the installer. The result of the consultation was the complete replacement of all damaged building contents, and internal fittings at a cost of £30,000 by the installer's insurance company.