ISO 27701 vs ISO 27001 isn’t really a versus at all — ISO 27701 is an extension of ISO 27001, not an alternative to it. ISO 27001 certifies how you protect information in general; ISO 27701 adds privacy-specific requirements to create a Privacy Information Management System. Understanding ISO 27701 vs ISO 27001 mostly means understanding how the privacy layer sits on top of the security base.
ISO 27701 vs ISO 27001: how the extension works
ISO 27001 gives you an Information Security Management System (ISMS) that protects the confidentiality, integrity, and availability of information. ISO 27701 takes that same system and extends it to manage the privacy of personal data, turning your ISMS into a Privacy Information Management System (PIMS).
The critical point: ISO 27701 is not standalone. It requires an ISO 27001 ISMS underneath it — you cannot be certified to 27701 without 27001.
How the extension works
ISO 27701 does three things to your ISO 27001 system:
- Modifies existing requirements. It adds privacy considerations to the ISO 27001 clauses (context, leadership, planning, and so on).
- Adds privacy controls. It introduces new controls — Annex A for PII controllers and Annex B for PII processors — that extend ISO 27001’s Annex A.
- Broadens scope. Your ISMS scope expands to cover the processing of personal data.
Security and privacy: related but different
| ISO 27001 | ISO 27701 | |
|---|---|---|
| Protects | Information in general | Personal data (PII) specifically |
| System | ISMS | PIMS (extends the ISMS) |
| Standalone? | Yes | No — requires ISO 27001 |
| Roles | — | PII controller & processor |
Extend security into privacy.
The ISO 27701 Toolkit layers cleanly onto an ISO 27001 ISMS — adding privacy policies, controller/processor controls, and records of processing so one integrated system covers both.
Why do both
Security and privacy are two sides of the same coin. A breach of personal data is both a security failure and a privacy failure. By extending your ISMS with ISO 27701, you manage them together — one set of leadership, risk, audit, and improvement machinery covering both — and you can demonstrate alignment with privacy laws like GDPR.
Choosing your path with ISO 27701 vs ISO 27001
Because one extends the other, the practical question is sequencing, not selection. If information security is your main concern and privacy is secondary, start with ISO 27001 alone. If you process significant personal data — or customers and regulators expect a privacy credential — plan for ISO 27701 too, ideally certifying both together to save audit effort. You cannot hold ISO 27701 without the ISO 27001 foundation, so in the ISO 27701 vs ISO 27001 comparison, 27001 always comes first. Both are published by ISO, and a single accredited body can assess the combined scope.
Frequently asked questions
Do I need ISO 27001 before ISO 27701?
You need it in place, but you can implement both together and certify at the same time.
Is ISO 27701 much extra work if I have ISO 27001?
Less than you’d think — the management-system foundation is already there. You’re adding privacy-specific scope, controls, and records.
New to the standard? Start with our complete guide to ISO 27701.
The bottom line on ISO 27701 vs ISO 27001: think ‘and,’ not ‘or.’ Build the security management system first, then extend it with privacy when your data processing warrants the added assurance.
A useful way to picture it: ISO 27001 is the house and ISO 27701 is the extension built onto it. You can live in the house without the extension, but the extension cannot stand alone. That is why every ISO 27701 audit also checks the ISO 27001 foundations underneath, and why doing both together is so much more efficient than tackling them separately.