ISO 27001 certification in Australia will be granted with a three-year validity period. Within the 3-year validity period, two surveillance audits will be undertaken at the end of every 12 months. The iso 27001 certification australia purpose of conducting surveillance audits is to verify that your company stays in compliance with the ISO 27001 standard. A Re-certification audit will be conducted at the end of the 3-year validity period to renew your ISO 27001 certification in Australia.