What Is ISO 27001? Certification Guide for SaaS Companies

TL;DR

• ISO 27001 is an international standard for information security management systems (ISMS). Certification is valid for 3 years with annual surveillance audits.
• ISO 27001:2022 has 93 controls across 4 themes (Organizational, People, Physical, Technological). Stage 1 reviews documentation, Stage 2 tests implementation.
• Most B2B SaaS companies certify in 6–12 months. Total first-year cost: $50,000–$150,000.

ISO 27001 is the international gold standard for information security management. If you sell software to European, APAC, or global enterprise customers, ISO 27001 certification is the credential that opens doors. This guide explains what it involves, how it differs from SOC 2, and what the certification process actually looks like for a SaaS company.

ISO 27001 Explained

ISO 27001 is a standard published by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It defines requirements for an Information Security Management System (ISMS) — a structured approach to managing information security risks.

The key difference from SOC 2: ISO 27001 results in a formal certification issued by an accredited certification body, valid for three years with annual surveillance audits. SOC 2 produces an auditor's report that must be renewed annually. For a detailed comparison, see our SOC 2 vs ISO 27001 guide, and for a three-way side-by-side with NIST CSF, our NIST vs ISO 27001 vs SOC 2 comparison.

The ISMS Requirement

ISO 27001 is not just a list of controls. It requires a management system — a documented framework for how your organization identifies, assesses, and treats information security risks. The ISMS includes:

• Risk assessment methodology — how you identify and evaluate risks
• Risk treatment plan — how you decide to mitigate, accept, transfer, or avoid each risk
• Statement of Applicability (SoA) — which of the 93 Annex A controls apply to your organization and why
• Internal audit program — how you verify your own ISMS operates correctly
• Management review — how leadership oversees and improves the ISMS

For practical guidance on building an ISMS, see our ISO 27001 ISMS reality guide. For SoA specifics, see our Statement of Applicability guide.

Annex A Controls (ISO 27001:2022)

The 2022 revision reorganized controls into four themes:

Organizational Controls (37) — Information security policies, roles and responsibilities, threat intelligence, asset management, access control policies, supplier relationships, information security in project management, and incident management.

People Controls (8) — Screening, terms of employment, security awareness training, disciplinary process, responsibilities after termination, confidentiality agreements, and remote working.

Physical Controls (14) — Physical security perimeters, entry controls, securing offices, physical security monitoring, protection against environmental threats, equipment maintenance, secure disposal, and clear desk/screen policies.

Technological Controls (34) — User endpoint devices, privileged access, information access restriction, authentication, capacity management, malware protection, vulnerability management, logging, network security, cryptography, secure development, and data masking.

Cloud-native SaaS companies can typically exclude some physical controls (data center infrastructure) since they use cloud providers, but every exclusion must be justified in the SoA.

The Certification Process

Stage 1 Audit (Documentation Review) — The certification body reviews your ISMS documentation: scope, risk assessment, SoA, policies, and procedures. They verify you have the management system designed before scheduling Stage 2. Typically 1-2 days on-site or remote.

Gap Remediation — Address any findings from Stage 1. Typically 2-4 weeks.

Stage 2 Audit (Implementation Audit) — The auditor verifies your ISMS is operating as documented. They interview staff, review evidence, test controls, and assess the effectiveness of your risk treatment. Typically 3-5 days depending on scope.

Certification Decision — If Stage 2 passes, the certification body issues your ISO 27001 certificate, valid for three years.

Surveillance Audits — Annual audits (years 1 and 2) covering a subset of controls to verify ongoing compliance.

Recertification Audit — Full audit in year 3 to renew the certificate.

Who Should Get ISO 27001

ISO 27001 is the right choice when:

• You sell to European or APAC enterprise buyers
• Your customers' RFPs specifically ask for ISO 27001
• You want a globally recognized certification (not region-specific)
• You need a management system that scales with your organization
• You plan to pursue additional standards like ISO 27701 (privacy) or ISO 22301 (business continuity)

ISO 27001 vs SOC 2: Quick Comparison

SOC 2 dominates North American procurement. ISO 27001 dominates international procurement. If you sell globally, you will eventually need both. The good news: 60-70% of controls overlap, so building one framework makes the second significantly easier.

Getting Started

Start with a gap assessment against the ISO 27001 requirements and Annex A controls. Identify which controls you already meet (often more than you expect if you have a SOC 2 program), build your risk assessment, and engage a certification body early.

CertifyOps builds ISO 27001 ISMS programs for B2B SaaS companies, from gap assessment through certification body coordination. Explore our services or schedule a scoping call.