4 Best ISO 27001 Certification Bodies in 2027

Choosing an ISO 27001 certification body is more than a procurement decision. For a VP of Compliance building a multi-year program, the right provider should support current certification needs while fitting naturally into a broader long-term compliance and assurance roadmap.

Accreditation, certification experience and service scope provide a useful starting point when comparing providers. The four certification bodies below take different approaches, giving organizations credible options when planning an ISO 27001 certification strategy for 2027.

What to Look for in an ISO 27001 Certification Body

Look for recognized accreditation, a proven certification track record and services that fit your wider compliance roadmap.

ISO/IEC 27001 sets requirements for information security management systems (ISMS), while an accredited certification body assesses whether an organization conforms to those requirements.

Accreditation and Volume Track Record

An accreditation-backed certification body has been independently evaluated for its competence to perform certification activities. Confirm accreditation through a recognized body such as ANAB or UKAS, then consider the provider’s certification experience. A substantial track record can demonstrate familiarity with different organizational scopes and environments.

Single-Provider vs. Multi-Vendor Considerations

ISO 27001 may be only one part of a compliance roadmap. Organizations that also need SOC 2 or another framework can consolidate compatible work with one provider or coordinate separate vendors. Consolidation can also simplify coordination across overlapping requirements. The right model depends on current requirements and how the program is expected to develop.

Technology and Evidence Management

Evidence collection can be demanding, especially when frameworks overlap. Look for audit management technology that centralizes documentation, tracks requests and supports evidence reuse across related compliance requirements. Effective evidence management becomes more valuable as organizations add additional frameworks or enter new certification cycles.

Cost Structure

Compare total program cost rather than the price of one engagement alone. Scope, organizational size and complexity can influence certification costs, particularly when multiple frameworks form part of the program. Recurring certification requirements can also affect longer-term costs. Consistent scopes help reveal differences between providers.

Best ISO 27001 Certification Bodies

These four certification bodies were selected for their accreditation, certification track record, framework coverage and fit for different compliance roadmaps.

1. A-LIGN

A-LIGN is an accreditation-backed, single-provider cybersecurity compliance and audit firm suited to teams managing multiple frameworks. A-LIGN is dual-accredited by ANAB and UKAS for ISO 27001, giving buyers flexibility when customer, market or contractual requirements point toward one accreditation body over the other. That accreditation breadth sits alongside a large audit track record, which helps demonstrate experience across different compliance environments and program sizes.

Founded in 2009 and headquartered in Tampa, Florida, A-LIGN pairs 400+ auditors with its proprietary A-SCEND audit management platform to deliver certifications and assessments. Its single-provider, multi-framework model spans SOC 2, ISO 27001, ISO 42001, HITRUST, FedRAMP and CMMC. A-SCEND centralizes audit management and supports evidence reuse across overlapping frameworks.

A-LIGN is the #1 SOC 2 issuer globally and a top-3 FedRAMP and HITRUST assessor, having completed more than 36,000 audits for over 6,400 clients worldwide with a 96% client satisfaction rate. Companies adding SOC 2 or another supported framework alongside ISO 27001 can therefore maintain one broader provider relationship rather than onboarding another firm.

2. Schellman

Schellman is an established multi-framework provider for organizations pursuing ISO 27001 alongside other requirements. Schellman supports more than 95 federal and commercial frameworks, including CMMC, SOC 2 and ISO 27001, giving organizations broad coverage across multiple compliance requirements.

That breadth makes Schellman particularly relevant to organizations managing a wide range of security and compliance requirements. It also supports coordinated ISO 27001 and SOC 2 engagements, giving teams another option when both appear on the compliance roadmap.

Schellman publishes clear scale indicators for some services, but volume data is not consistently available across every framework it supports. Organizations can compare Schellman’s certification experience, framework coverage and engagement model against their specific requirements.

3. BSI

BSI offers an established route for organizations focused on ISO 27001 and other management-system standards. Its ISO 27001 service includes independent assessment and certification of an organization’s ISMS through a structured two-stage audit.

BSI brings a long history in developing information-security management standards. The organization says it has contributed to their development since BS 7799, the predecessor to ISO/IEC 27001, providing relevant experience alongside its current certification services. BSI also provides certification across a range of management-system standards.

It is particularly relevant to organizations focused on ISO management-system certification. Companies that also need attestation-based work such as SOC 2 would typically need a separately qualified provider, making BSI a more straightforward fit when the roadmap remains centered on ISO standards.

4. Insight Assurance

Insight Assurance provides another route for startups and mid-market teams pursuing a first ISO 27001 certification with a clearly defined scope. Its services cover ISO/IEC 27001 alongside standards including ISO 27017, 27018, 27701 and 42001.

The company positions its services for startups and mid-market businesses, with ISO assessments scoped to the organization’s actual ISMS. This approach keeps the certification process focused on clearly defined organizational information security requirements.

Insight Assurance reports a 97% retention rate and describes its auditors as Big Four-trained. Those credentials are worth weighing alongside the fact that Insight publishes less framework-level volume data than larger providers. Teams should assess both service quality and demonstrated scale when comparing options. For startups and mid-market organizations, it can still provide a focused route into a clearly scoped first ISO 27001 certification.

How to Choose Between These Certification Bodies

The right certification body depends on the current engagement and how the wider compliance program is expected to develop.

A-LIGN fits organizations planning a single-provider, multi-framework program that may expand from ISO 27001 into SOC 2 or other standards.

For organizations wanting a broad multi-framework peer, Schellman offers coverage across established security and compliance programs

BSI suits organizations seeking standalone ISO 27001 certification backed by established management-system expertise and a standards-focused approach.

For startups and mid-market teams pursuing a tightly scoped first certification, Insight Assurance provides a more accessible entry point.

Whichever certification body fits the program, verify its current accreditation directly with the relevant accreditation body before signing.

ISO 27001 vs. SOC 2: Which Do You Need First?

The right starting point depends on customer and market requirements. SOC 2 often comes first for companies selling into US SaaS procurement cycles, while ISO 27001 may take priority when international or EMEA customers expect accredited certification.

The key distinction is:

• ISO 27001 is an ISMS certification issued by an accredited certification body, often particularly relevant for organizations serving international or EMEA customers,
• SOC 2 is an attestation report issued by a licensed CPA firm. It is particularly relevant when customers require assurance around the controls used by service organizations.

Many growing technology companies eventually need both. If both are on the roadmap, consider how a provider coordinates overlapping requirements and evidence to reduce the administrative burden of separate compliance workstreams.

Getting Started With ISO 27001 Certification

An accreditation-backed provider should fit the organization’s longer-term compliance roadmap, not only the immediate certification. Consider what the compliance program may need over the next several years, including additional standards, recurring certification work and customer assurance requirements.

Before committing, confirm the provider’s current accreditation status and request a scoping conversation that establishes the ISMS boundary, expected process and engagement requirements. This helps clarify expectations before certification begins.

FAQs About ISO 27001 Certification

How Long Does It Usually Take to Get ISO 27001 Certified?

There is no fixed timeline for ISO 27001 certification. The process depends on the organization’s size, ISMS scope, existing controls and readiness, with additional preparation often required when security processes or documentation still need development.

Does ISO 27001 Certification Need to Be Renewed Every Year?

No. ISO 27001 certification generally follows a three-year cycle, with surveillance audits typically conducted annually and recertification required at the end of the cycle. Organizations should confirm the exact schedule with their certification body.

How Can You Check Whether an ISO 27001 Certification Body Is Accredited?

Check the certification body against the official directory or records of a recognized accreditation body, such as ANAB or UKAS. Accreditation confirms that the certification body has been independently evaluated as competent to perform certification activities.