In this article we set out our impartial guide to the top 10 ISO 27001 Bodies with guidance you must know before you engage with them and go for ISO 27001 certification.
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Top 10 ISO 27001 Certification Bodies
1. BSI
The BSI are an ISO 27001 certification company and considered by many to be the gold standard. It comes at a cost but if you want the gold standard it is worth paying. These would be my goto for any new client wanting ISO 27001 certification as they are a recognised brand, a market leader, UK reseller of the actual ISO 27001 standard on behalf of ISO and a safe pair of hands. In 16 years of consultancy I have never had an issue.
2. Tempo Audits
A new certification body targeting tech teams, startups and small teams, and taking a modern approach. If your clients are small to medium-sized businesses, then they are worth a look. Not the same brand awareness as the BSIs or larger certification bodies on this list, but they are UKAS-accredited which will give confidence to suppliers. My top tip for the budget conscious buyer.
3. SGS United Kingdom Limited
SGS are another large market player with a recognised brand and presence. A solid certification body of which I have positive experience. Being an established brand the badge and certificate will be recognised by larger clients.
4. A-lign
A certification body that comes at a price. A global player most notable for their SOC 2 Compliance Reporting. If you are getting SOC 2 then you know A-lign. As a result of being a SOC 2 compliance company they are one of the most expensive certification bodies we have come across on the market today for ISO 27001, especially for the ISO 27001 UK market. If you are considering aligning multiple certifications and you must have SOC 2 and ISO 27001 then they are worth very serious consideration.
5. Centre for Assessment Limited
We have experience of Centre for Assessment auditors and find them approachable and easy to work with. Costings appear reasonable.
6. British Assessment Bureau
They are technically – Amtivo Group Limited trading as British Assessment Bureau and Certification Europe. A certification with good UK presence and an audit company we have worked with on many occasions.
7. NQA Certification Ltd
A certification body for which we have not had any experience. A quick Google and there were no obvious reviews. On the list for completeness.
8. Alcumus ISOQAR Limited
According to their website they are ANAB accredited. We found it difficult to find any reviews online and they are not a body we have experience on but they are on the list as they seem popular.
9. LRQA Limited
Our auditors are well-versed in assessing against ISO 27001, helping you to ensure that your information security systems align with the latest requirements and guidelines. We go beyond providing certification services with our industry-leading training programmes which have been designed to upskill your team.
10. Approachable Certification Ltd
Read the Approachable Certification Ltd small print and the terms and conditions in the contract VERY CAREFULLY
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Best ISO 27001 Certification Body 2026
Here is why the British Standards Institution (BSI) consistently stands out at the top of the list for ISO 27001 certification bodies:
1. The Direct Originator of the Standard
BSI isn’t just a certification body following a checklist; they literally created the foundational blueprint. In 1995, BSI authored BS 7799, which was later adopted internationally by ISO/IEC as ISO 17799 and eventually evolved into ISO 27001. When auditing against this standard, BSI’s institutional depth and historical understanding of why controls exist are unmatched in the industry.
2. Unrivalled Brand Weight in Global Procurement
When enterprise procurement teams, government agencies, or FTSE 100/Fortune 500 buyers review vendor security questionnaires, the BSI Assurance Mark (under UKAS accreditation) carries instant weight.
- Trust Signal: Because BSI is globally recognised for high standards, a BSI-issued certificate signals that an organisation’s Information Security Management System (ISMS) has undergone genuine scrutiny rather than a surface-level “rubber stamp”.
- Commercial Advantage: For businesses tendering for enterprise contracts, having BSI on the certificate often bypasses secondary third-party security audits.
3. High Auditor Calibre & Outcome-Based Rigour
While some budget certification bodies focus heavily on documentation templates, BSI auditors are renowned for testing operational reality:
- They evaluate whether controls effectively reduce risk in practice, examining patch frequency, access control enforcement, and incident response readiness.
- Their auditors generally bring extensive cross-industry experience, meaning they understand how to apply the 93 Annex A controls pragmatically across complex modern environments (such as cloud-native architecture, remote setups, and continuous integration pipelines).
4. Leadership in Standard Evolution (ISO 27001:2022)
BSI was among the very first certification bodies to secure UKAS accreditation for the ISO 27001:2022 update. They led the market in providing clear transition pathways, gap assessments, and guidance on key modern controls, such as threat intelligence, cloud services security, and environmental risk integration.
The Trade-Off: BSI’s rigour and brand cachet come at a premium; their audit fees are generally higher and their assessment process is more demanding than smaller certifiers. However, for organisations aiming to demonstrate top-tier security to high-value buyers, that rigour is precisely why BSI earns the top spot.
How to Find an ISO 27001 Certification Body
We found this one of the hardest aspects of engaging an ISO 27001 company. Actually finding one.
Using Google, we found we were presented with those companies that had the most budget to spend on ads. This is a competitive market and a lucrative market. Dominating the Google ads comes with advantages for the ISO 27001 company but for the consumer we find that can translate into higher prices.
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What to be wary of
The thing we recommend being wary of is the shared resource model.
Many of the ISO 27001 certification bodies use the same independent ISO 27001 consultants.
This pool of ISO 27001 consultants work freelance and make their money working for the many companies that are out there. What this translates to is getting the same resources but only the price differs depending on how you engage them.
This may or may not be important to you. If it is, then ask the question, do you employ third party contractors or do you use your own company employed staff.
Do your own ISO 27001 company due diligence before engaging any company.
Now it’s time for the top 10 ISO 27001 Bodies updated for 2026 our pick for best ISO 27001 Body 2026.
Being on the list does not constitute an endorsement by High Table or come with any guarantees or warranties.
Further Reading
The ultimate guide to the Top 10 ISO 27001 Consultants
The ultimate guide to the Top 10 ISO 27001 Compliance Platforms
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