Top ISO 27001 Certification Bodies & Auditors
ISO 27001 certification requires an accredited certification body (also called a registrar). Unlike SOC 2, the auditor must be accredited by a national accreditation body (such as ANAB in the US or UKAS in the UK). Choosing the right certification body affects audit quality, international recognition, and ongoing surveillance costs.
What to Look For in a ISO 27001 Auditor
- Verify the certification body is accredited by a recognized national accreditation body (ANAB, UKAS, DAkkS, JAS-ANZ, etc.).
- Check if the certification body has experience with your industry — financial services, healthcare, and SaaS each have different risk profiles.
- Ask about the Stage 1 and Stage 2 audit process, including estimated duration for each stage.
- Understand the surveillance audit schedule — ISO 27001 requires annual surveillance audits and a full recertification every 3 years.
- Request a quote that includes Stage 1, Stage 2, and the first two surveillance audits so you can compare total 3-year costs.
- Ask whether the certification body also offers internal audit services (note: they cannot audit and certify the same ISMS).
- Confirm the auditors assigned to your engagement have relevant technical certifications (ISO 27001 Lead Auditor, CISA, etc.).
ISO 27001 Auditor Firms
BSI (British Standards Institution)
BSI is the original publisher of BS 7799, the standard that became ISO 27001. As one of the world's largest certification bodies, BSI has certified tens of thousands of organizations worldwide and is recognized across all major markets.
Bureau Veritas
A global leader in testing, inspection, and certification with operations in 140+ countries. Bureau Veritas is one of the most widely recognized certification bodies and can provide globally accepted ISO 27001 certificates.
Schellman
US-based firm that combines ISO 27001 certification with SOC 2 and other framework assessments. Schellman is ANAB-accredited and popular with technology companies seeking multi-framework compliance.
A-LIGN
Full-service compliance firm that is ANAB-accredited for ISO 27001 certification. A-LIGN is known for bundling ISO 27001 with SOC 2, PCI DSS, and other frameworks into efficient multi-framework engagements.
BARR Advisory
Cloud-focused firm offering ISO 27001 certification alongside SOC 2 and HITRUST assessments. BARR has deep expertise in cloud environments and can evaluate ISMS controls for AWS, Azure, and GCP-based organizations.
NQA (National Quality Assurance)
UKAS-accredited certification body with offices in the US and UK. NQA is known for competitive pricing and efficient audits, making them popular with small and mid-size companies pursuing ISO 27001 for the first time.
Coalfire Certification
The certification arm of Coalfire, a major cybersecurity firm. They offer ANAB-accredited ISO 27001 certification with deep technical expertise, particularly for organizations in regulated industries and government.
Prescient Security
New York-based firm offering ISO 27001 certification as part of multi-framework compliance packages. Prescient is known for working with high-growth technology companies and offering bundled audit services.
Pricing & Timeline
Typical Pricing
$10,000 – $80,000
Depending on organization size, scope, and complexity. First-time assessments may include readiness and gap analysis fees.
Expected Timeline
Stage 1 (documentation review) takes 2-4 weeks, followed by Stage 2 (on-site/remote assessment) at 4-8 weeks. Total time from kickoff to certification is typically 3-6 months, plus annual surveillance audits.
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Frequently Asked Questions
What is the difference between ISO 27001 and SOC 2?
ISO 27001 is an international certification standard for an Information Security Management System (ISMS). SOC 2 is a US-based attestation report issued by a CPA firm. ISO 27001 is more recognized internationally, while SOC 2 is dominant in the US market.
How long is an ISO 27001 certificate valid?
An ISO 27001 certificate is valid for 3 years, subject to successful annual surveillance audits (usually conducted 6 and 18 months after initial certification). A full recertification audit is required every 3 years.
What is the difference between Stage 1 and Stage 2 audits?
Stage 1 is a documentation review to confirm your ISMS is designed properly and you are ready for the full audit. Stage 2 is the comprehensive assessment where auditors verify your controls are implemented and operating effectively.
Does the certification body need to be accredited?
While not legally required in most jurisdictions, using an accredited certification body (accredited by ANAB, UKAS, or equivalent) is strongly recommended. Many customers and partners will not accept certificates from non-accredited bodies.
Can I bundle ISO 27001 with SOC 2 to save money?
Yes. Many firms (like Schellman, A-LIGN, and BARR) offer multi-framework engagements that combine ISO 27001 and SOC 2 audits. This can reduce total costs by 20-30% compared to separate engagements because of overlapping controls and evidence.
How much does ISO 27001 certification cost?
Initial certification typically costs $10,000-$80,000 depending on organization size and complexity. Annual surveillance audits add $5,000-$20,000 per year. Budget for the full 3-year cycle when comparing quotes.
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