Keywords: Advanced Search Engineers Name: Steenhof Building Services Group Address: 126 Mississaga Street East, Orillia, ON L3V 1V7 Phone Number: 705-325-5400 Fax: 705-325-8400 Website Address: www.steenhofbuilding.com Category: Engineers Name: Tatham Engineering Ltd. Address: 10 Diana Drive, Unit 7, Orillia, ON L3V 8K8 Phone Number: 705-325-1753 Fax: 705-325-7420 Website Address: www.tathameng.com Category: Engineers Description: Engineering Services.