A surveillance audit is the interim audit that the certification body carries out periodically within the certificate validity cycle. Its purpose is to verify that the management system is being maintained after the certification audit.
It is usually conducted once a year. Its scope is narrower than the initial certification audit; rather than the whole system, defined critical areas and the closure of previous nonconformities are examined.
Difference from recertification
A recertification audit is conducted at the end of the certificate cycle and covers the whole system. A surveillance audit is an interim check.
This distinction becomes important in standard transitions. In some standards the transition can be made at either audit type, while in others it is only possible at the recertification audit.
Its role in transition planning
In standard revisions, if you can align the transition with your existing surveillance audit, you pay no additional audit day. If you cannot, you need to schedule a standalone transition audit and bear its cost.
That is why the first step of transition planning is mapping out your certification calendar: the certificate issue date, surveillance audit dates and recertification date.
Surveillance audits apply to all certifiable management systems. The effect of the audit cycle on your transition planning is worked through on your own certificate calendar in programmes such as the ISO 14001:2026 transition training. See our Academy page for all training topics.