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Explore the 10 Best ISO 27001 Certification Companies

Are you looking for the best ISO 27001 consultants? Need an ISO auditing company? Find out the 10 best ISO 27001 certification companies in the article.

Are you looking for an ISO 27001 certification company that can help you achieve compliance? There is no doubt that selecting the right partner is crucial for ensuring your organization's Information Security Management System (ISMS) is up to industry standards. This is because a reputable certifier not only validates your security measures but also instills confidence in your stakeholders. However, the task can be daunting if you don't already have a proper roadmap. This blog post provides a comprehensive guide and ranks the top 10 ISO 27001 certification companies in the field based on their expertise to help you make an informed decision. 

1. Eden Data  

Ready to embark on your ISO certification journey? Eden Data – has got you covered. Partnering with us means that you have a team of cybersecurity sidekicks at your disposal who are prepared to assist you throughout the entire compliance process. Here is a glimpse of how we will ensure your organization meets ISO 27001 requirements.

First, we conduct a gap analysis to identify areas where your ISMS falls short of the standards. Next, we assist in implementing the necessary controls and processes to fill these gaps. Aside from that, our team will provide training to staff to ensure ongoing compliance. Once your ISMS is aligned with ISO 27001, we will help you prepare for the certification audit. 

But that is not all. 

Partnering with Eden Data comes with lots of benefits: 

  • Team of Cyber Whizzes: Our squad – an assembly of former military cyber specialists and seasoned Big 4 pros – fortifies your business against threats. Also, they will ensure you meet all compliance requirements and stay competitive, signaling to your clients and stakeholders that you take security seriously.
  • Client-First Approach: Our clients are more than just entries in a spreadsheet; they're our digital family. We stand shoulder-to-shoulder with you, keeping your data under lock and key while you focus on what you do best.
  • Flexible Pricing Plans: Say goodbye to the dated, drain-your-wallet hourly/project rates and enjoy a refreshing subscription-based model – Seed, Sprout, and Sapling. Our pricing model gives you access to a team for the price of one.
  • Transparency: We won't suggest solutions just to line our pockets, as we'll assess your workspace from every angle to provide the most realistic, effective, and affordable solutions.

So what are you waiting for? Step into the future of cybersecurity with Eden Data. We're ready when you are!

  • Headquarters: Austin, TX, USA
  • Founded: 2021
  • Email Address:
  • Website:
  • Contact: +1 737-377-1880
  • Address: Austin, Texas, 78734, United States
  • Specialization: Cybersecurity Consulting Services

2. XpertDPO

XpertDPO is a data security, risk and compliance, General Data Protection Regulation (GDPR), and ISO consultancy that offers practical, tailor-made solutions for clients in the public and private sectors. With headquarters in Ireland and additional offices in the UK and Bahrain, the company provides customized solutions that include vulnerability gap analysis, data protection support, and SOC 2 audits and reporting. 

XpertDPO offers consultancy services for ISO 27001 and ISO 27701 certification, adopting a value-driven, practical strategy to help clients achieve them. The firm also specializes in providing Nominated European Representative Services for organizations based outside of the EU and the UK.

  • Headquarters: Dublin, Republic of Ireland  
  • Founded: 2018
  • Email Address:  
  • Website:
  • Contact: +353 1-678-8997,
  • Address: 20 Harcourt Street, Dublin 2, D02 H364, Republic of Ireland 
  • Specialization: Outsourced DPO services, GDPR Consultancy, SOC 2 Audits

3. Blackmores

Founded in 2006, Blackmores has helped over 600 organizations achieve ISO certification and covers a library of 20 standards in quality, risk, and sustainability. The company has also introduced innovative platforms like the isologyhub, an online consultancy and training portal, and The ISO Show, a podcast focused on ISO Standards.

Blackmores offers a range of services, including consultancy, auditing, and compliance support, tailored to businesses of all sizes and has a global reach, with strategic alliances allowing it to offer localized market knowledge. The team also has a strong commitment to sustainability, aligning services with the Sustainable Development Goals (SDGs) and supporting the Terra Carta initiative.

  • Headquarters: Letchworth Garden City, Hertfordshire, UK
  • Founded: 2006
  • Email Address:
  • Website:
  • Contact: +44 146-251-4549
  • Address: The Spirella Building, Bridge Road, Letchworth Garden City, Hertfordshire, SG6 4ET, United Kingdom
  • Specialization: ISO Standards Consultancy 

4. Bulletproof

Bulletproof is a UK-based cybersecurity company that operates an advanced in-house Security Operations Centre (SOC) for 24/7 threat monitoring. In the realm of data protection, Bulletproof provides GDPR consultancy to help businesses comply with EU and UK regulations. It also offers specialized training sessions. For businesses needing more targeted support, they provide Data Protection Officer (DPO) services on both an ad hoc and ongoing basis.

For strategic security planning, Bulletproof offers a Virtual CISO (vCISO) service to help businesses manage risk and make targeted security improvements. They also conduct cybersecurity assessments based on NIST and ISO frameworks to help companies understand their security posture.

  • Headquarters: Stevenage, Herts, UK  
  • Founded: Not specified  
  • Email Address: Not specified  
  • Website:
  • Contact: +44 143-850-0500
  • Address: Unit H, Gateway 1000, Whittle Way, Stevenage, Herts SG1 2FP, GB
  • Specialization: Cybersecurity Consultancy

5. DRB Compliance

DRB Compliance, an independent digital security consultancy, specializes in helping firms navigate the complexities of regulatory compliance, particularly in the areas of FCA regulations and data protection. They focus on multiple services that range from initial gap analysis to full ISO 27001 certification, providing ongoing support through their Virtual Security Officer (VSO) service. 

The company also offers ISO 9001 certification, which focuses on quality management systems and aims to integrate compliance into a firm's day-to-day operations, allowing companies to focus more on growth. DRB Compliance covers various industries, including insurance, hospitality, and the hotel and leisure sectors.

  • Headquarters: Halstead, Essex, UK
  • Founded: N/A  
  • Email Address:  
  • Website:
  • Contact: +44 178-747-6929
  • Address: The Studio, 65 Colchester Rd, Halstead, Essex, CO9 2EN  
  • Specialization: FCA Compliance, Data Protection, ISO 27001 and ISO 9001 Certification 

6. Advent IM

This UK-based consultancy company specializes in governance, risk, and compliance (GRC) in addition to physical security. Founded in 2002, Advent IM has its headquarters in the West Midlands and offers national delivery through a highly specialized team. The team serves both public and private sectors, including government, police, education, and healthcare. 

Advent IM offerings encompass a wide range of security needs, from information risk management and ISO 27001 compliance to GDPR compliance and business continuity planning. The company is a Crown Commercial Services Supplier (CCSS) and a cybersecurity supplier to the HM Government. 

  • Headquarters:  Halesowen, West Midlands, UK  
  • Founded: 2002  
  • Email Address:  
  • Website:
  • Contact: +44 121-559-6699   
  • Address: Maypole Fields, Halesowen, West Midlands B63 2QB, GB  
  • Specialization: Information and Physical Security, Compliance, Risk Management 

7. Evalian

With offices in Southampton, London, Manchester, Dublin, and Worcester, Evalian holds certifications in ISO 9001 and ISO 27001 and is CREST-approved for penetration testing. The agency serves a diverse clientele ranging from single-employee businesses to global corporations in sectors such as healthcare, financial services, and technology and provides end-to-end support from pre-certification assessments to ongoing managed services. 

In the realm of data protection, Evalian provides GDPR and Data Protection Act 2018 compliance services, including outsourced data protection officer roles. They also offer specialized services such as security standards framework, supply chain risk management, cloud security assessments, and cyber awareness training.

  • Headquarters: Colden Common, Hampshire, UK  
  • Founded: N/A  
  • Email Address:  
  • Website:
  • Contact: +44 333-050-0111  
  • Address: West Lodge, Leylands Business Park, Colden Common, Hampshire, SO21 1TH
  • Specialization: Data Protection, Cybersecurity, ISO Consultancy 

8. Citation ISO Certification

Established in 1993 and with more than 30,000 certificates issued, Citation ISO Certification (formerly known as QMS) focuses on providing ISO accreditation and business security awareness training. Its services extend from certification to verification and consultancy, aiming to help businesses improve their operational efficiency and comply with industry regulations. 

Citation ISO Certification serves a diverse clientele, covering sectors like construction, cleaning, manufacturing, and logistics. It also focuses on phishing prevention and malware management to safeguard businesses. Plus, the company provides in-depth training for employees, covering key areas of information security and how to handle social engineering attacks.

  • Headquarters: Muspole, Norwich, UK  
  • Founded: 1993  
  • Email: N/A  
  • Website:
  • Contact: +44 160-363-0345  
  • Address: Muspole Court, Muspole Street, Norwich NR3 1DJ  
  • Specialization: Information Security Management

9. High Table

High Table has a strong focus on small businesses and provides a range of templates, policies, and documents to help them get certified. Their unique YouTube channel offers free ISO 27001 guidance, making it easy for companies to know what to expect from their services. 

Their array of services encompasses a "Do It Yourself" toolkit, which is designed to assist firms in obtaining certification at a reduced expense. Additionally, they provide a complimentary 30-minute consultation to explore your ISO 27001 requirements. Moreover, High Table has an international presence, having assisted more than 4,000 businesses, including an international space agency, in achieving certification.

  • Headquarters: London, UK 
  • Founded: 2020  
  • Email Address: N/A
  • Website:
  • Contact: +44 203-011-1552  
  • Address: 21 Soho Square, London, England W1D 3, GB
  • Specialization: ISO 27001 Certification  

10. AvISO Consultancy

AvISO Consultancy offers software and training solutions to assist clients in meeting ISO standards. Its ISO Cost Calculator allows potential clients to estimate their monthly rate, further simplifying the financial planning process. The company has a team of highly skilled technical specialists who guide and support companies throughout the certification process. 

AvISO Consultancy also caters to a diverse clientele, from SMEs to multinational enterprises, and covers a wide range of industries, including construction, manufacturing, tech, automotive, and engineering. It also provides gap analysis to help organizations align with industry-specific and ISO standards.

  • Headquarters: London, UK
  • Founded: N/A  
  • Email Address:  
  • Website:
  • Contact: +44 203-745-8476  
  • Address: 201 Borough High St, London SE1 1JA, United Kingdom  
  • Specialization: ISO Standard Certification, Compliance and Risk Management  

Core Principles of ISO 27001

ISO 27001 framework is built on three core principles that serve as the foundation for effective security management. Adhering to them not only ensures compliance with the standard but also builds a robust security posture that can withstand evolving cyber threats. The table below highlights each principle:  




Focuses on protecting data and systems from unauthorized access. It is achieved through measures like multi-factor authentication, secure tokens, and encryption protocols.


Aims to ensure the accuracy, reliability, and completeness of data. Implemented through validation processes that eliminate errors and restrict access to approved personnel only.


Concerns the ongoing maintenance and monitoring of ISMS. Includes eliminating bottlenecks, updating software and hardware, enhancing business continuity through redundancies, and mitigating data loss with backup and disaster recovery mechanisms.

Which Industry Needs ISO 27001? 

Here's a look at the sectors that most frequently implement this standard for enhanced data protection.

Financial Services

Institutions like banks, insurance providers, and investment companies deal with vast amounts of confidential customer data and are common targets for cyber threats. To manage risks and comply with regulations, these entities often turn to ISO 27001 as a cornerstone of their security and compliance initiatives.


Entities such as hospitals, clinics, and medical labs handle sensitive patient data, including medical histories and payment information. To meet data protection laws like HIPAA in the U.S. and GDPR in the EU, healthcare providers frequently adopt ISO 27001 as a guiding framework for security compliance.


Tech firms, whether they're software developers, IT service providers, or data center managers, need strong security protocols to protect both their intellectual property and customer data. ISO 27001 serves as a reliable standard to validate their security measures and build trust with clients.


Agencies at various governmental levels are tasked with safeguarding a wide range of sensitive data, from citizen information to national security details. The framework often forms an integral part of their risk management strategies and security protocols.

Key Consideration When Choosing an ISO 27001 Consulting Firm

When choosing an ISO 27001 consulting firm, consider these five key factors:

  1. Objectives: Understand your specific goals related to ISO 27001 compliance. Are you also considering other certifications like SOC2 or FedRAMP? Knowing why you need it will help you align with a consulting firm that can meet your requirements.
  1. Qualifications: Evaluate the firm and the individual consultants. Check their experience in your industry and whether they offer complementary services like penetration testing. Certifications and strong references are also important.
  1. Cost: Understand the pricing model – determine if it's based on the actual time and resources used (time and materials) or a predetermined, set cost (fixed price). Also, consider the cost in the context of your specific situation. If certification is critical for a major contract, spending extra for expertise may be justified. Read more about ISO certification costs here.
  1. Location: Decide if geographic proximity is important for you. In the era of virtual organizations, this may or may not be a significant factor.
  1. Cultural Fit: The consulting firm should align with your corporate culture, especially since they'll be interacting with various departments in your organization. Effective communication and a flexible approach are key.

5 Key Benefits of ISO 27001 Certification

Here are five key benefits that make this certification a strategic asset for any business:



Financial Risk Mitigation

Reduces financial risks from data breaches, with robust security measures preventing costly incidents. Adherence to the standard minimizes monetary and reputational damage.

Competitive Advantage

Acts as a market differentiator by instilling client confidence and attracting new business. Enables companies to tender for contracts and stand out from competitors.

Regulatory Compliance

Aligns with regulatory requirements like GDPR and NIS Regulations, and mandates comprehensive risk assessments to identify compliance gaps. This proactive stance can prevent legal issues and penalties.

Improved Structure and Focus

Provides a clear framework for managing information risks, assigns clear responsibilities, and avoids confusion. Enhances productivity and decision-making, allowing businesses to focus on value creation.

Third-Party Validation

Requires regular internal and external audits for an independent opinion on the firm's security posture. External auditors review the ISMS to ensure its effectiveness, offering an additional layer of credibility to clients and stakeholders.


The top 10 companies in this field have proven expertise and a track record of delivering robust, compliant ISMS frameworks. By choosing a reputable ISO 27001 certification company, you not only ensure adherence to international standards but also gain a strategic partner in safeguarding your data assets against evolving cyber threats. 

Our team is ready to answer any and all questions you may have.