Its strategy of growth through acquisition has seen Mitie acquire several businesses over the past few years. In March 2006 it acquired Initial Security, a leading security business. In 2007 Mitie acquired Robert Prettie & Co. Ltd for £32.7m and incorporated the specialist plumbing, heating and mechanical services business into their Property Services division. In 2008 Mitie continued its strategy through the acquisition of Catering Partnership and DW Tilley. The purchase of DW Tilley allowed Mitie to extend their roofing services nationwide. 2009 saw the acquisition of Dalkia Facilities Management for £130m to bolster its Technical Facilities Management capability, and an expansion into social housing with the purchase of Environmental Property Services (EPS) for £38.5m. In 2010, Mitie acquired the integrated facilities management business of Dalkia in Ireland.