ISO 27001 Cost

In this impartial guide to ISO 27001 Cost we review the cost of ISO 27001 certification and break down all of the ISO 27001 costs and options.

Key Takeaway

The ISO 27001 certification cost is not a single price but a combination of different expenses that range from $5,000 to $50,000. The total cost depends on factors like

• the size of your organisation
• how complex your operations are

The entire ISO 27001 Certification process usually taking about six months to complete.

ISO 27001 total costs breakdown

There are 5 key costs that make up the total cost of your ISO 27001 certification and they are:

Cost Category	Estimated Expenditure	Key Considerations
1. Preparation Costs	$300 – $10,000+	ISO 27001 Standard documents and optional professional gap analysis.
2. Implementation Costs	$500 – $40,000	Options range covers DIY toolkits ($500) vs. Consultants ($20k) vs. Compliance Platforms ($40k+).
3. Internal Audit Costs	$3,500 – $10,000	Mandatory annual requirement for maintaining your certification.
4. Accredited Certification Audit by an Accredited Certification Body	$3,500 – $15,000	Two-stage certification process based on your employee headcount.
5. Ongoing Costs	~1/3 of Initial Accredited Certification Audit Cost	Annual certification body surveillance audits with a full recertification every 3 years.

What impacts ISO 27001 Certification Cost?

There are 5 key factors that directly affect your ISO 27001 Cost. They are:

1. The size of your organisation: Your total number of employee’s and how complex your business operations are directly dictate the mandated audit duration and associated day-rate fees charged by the certification body.
2. Your Certification Scope: The more of your business that is in the scope, the more needs to be audited. It makes sense therefore that clearly defining boundaries for in-scope versus out-of-scope assets minimises complexity, reduces preparation work and reduces auditor assessment time.
3. Your Number of Locations: The more offices and locations that you have the more that needs to be audited and this will increase your auditor travel expenses as it means additional on-site auditor visits.
4. The Choice of Certification Body: Whilst the number of audit days will be consistent between accredited certification bodies, the day rates they charge will differ. As a rule, the bigger the audit company the bigger the fees.
5. How you implement it: This is the biggest cost with the biggest variation as you explore low cost do it yourself through to expensive recurring subscription fees for automation platforms.

For a list of reputable options, you can refer to resources on the best ISO 27001 certification companies from High Table and their guide – the best ISO 27001 certification companies.

ISO 27001 Certification Cost Calculator

This simple ISO 27001 certification cost calculator is based on the guidance in the ISO/IEC 27006-1:2024 standard. It sets the number of audit days based on your number of employees.

Number of Employees	Number of Audit Days	Estimated ISO 27001 Cost
1 – 10	5	$6,250
11 – 15	6	$7,500
16 – 25	7	$8,750
26 – 45	8.5	$11,250
46 – 65	10	$12,500
66 – 85	11	$13,750
86 – 125	12	$15,000
126 – 175	13	$16,250
176 – 275	14	$20,625
276 – 425	15	$21,875

Preparation Costs: $300 to $10,300

Preparation costs are your first costs and cover the mandatory purchase of the official ISO standard. It also includes the optional cost of a professional gap analysis.

Preparation Item	Cost (GBP)	What you get
ISO 27001:2022 Standard	$150 approx.	The core regulatory blueprint for building your Information Security Management System (ISMS).
ISO 27002:2022 Standard	$150 approx.	Detailed implementation guidebook for setting up Annex A security controls.
Professional Gap Analysis	$3,500 – $10,000	Expert external assessment to identify compliance shortfalls before booking your official audit.
DIY Gap Analysis	$0 (Internal Resource)	Self-assessment conducted using internal expertise or structured toolkits to map your current compliance state.
Total Preparation Budget	$300 – $10,300	Combined financial estimate for the discovery and planning phase.

Implementation Costs: $500 to $40,000 per year

Implementation costs represents the biggest ISO 27001 certification cost and the most variable depending on the implementation option you take.

Implementation Method	Estimated Cost	Time to Implement	Key Deliverables & Risks
Do It Yourself (Toolkit)	$500 (One-off)	30 to 90 days	Includes all auditor-verified templates, policies, and guides. The fastest, lowest-cost option for lean teams.
Traditional Consultant	$5,000 – $40,000	6 to 12 months	Hands-on guidance and custom writing, but comes with a high financial premium.
Internal Employee	$40,000+ per year	6 to 12 months	Requires writing policies entirely from scratch. High salary overhead and uncertain implementation speed.
Compliance Platform	$40,000+ per year	6 to 12 months	Compliance platforms like Vanta and Drata are expensive options that usually require and internal employee to manage them.
External Contractor	$40,000 – $160,000	6 to 12 months	Dedicated expert focus to write policies, but represents the highest cost tier on a daily rate.

Audit Costs: $6,250 to $50,000

Audit costs are mandatory costs. There are two types of audit.

• Internal audit: audit you do yourself
• External audit: the audit the certification body does

Audit Type	Estimated Cost (USD)	Description
Certification Audit (Total)	$6,250 – $50,000	Total external third-party cost for achieving accreditation based on organisational size and complexity.
Stage 1 & 2 Audit	$6,250 – $40,000	Initial assessment phases: comprehensive documentation review and operational control testing.
Internal Audit	$3,500 – $10,000	Mandatory annual review conducted by qualified, objective independent specialists.
Surveillance Audit	$3,000 – $10,000	Annual check-in audits required by certification bodies to maintain valid status.

Let’s break down these audit costs in greater detail so you can accurately budget for the audit stage of your journey.

Internal Audits

Internal audits are a mandatory requirement for ISO 27001 certification. These are audits you do yourself to check everything is working as it should be. They must be performed every year.

ISO 27001 Certification Audits (Stage 1 & Stage 2)

The external certification process is split into two stages.

• Stage 1 Audit (Documentation Review): The auditor checks your Information Security Management System, policies, and mandatory documentation to ensure your framework meets the clauses of the ISO 27001:2022.
• Stage 2 Audit (On-Site or Remote Testing): The auditor checks your operational information security processes using a show and tell approach.

ISO 27001 Surveillance Audits

Surveillance audits are the mandatory yearly check-ups required to keep your ISO 27001 certification active. In Year 1 and Year 2 following your initial certification, your chosen certification body will conduct a streamlined audit to verify that your management system continues operating effectively.

The cost of a surveillance audit is typically about one-third of your initial certification fee. This is a non-negotiable requirement and failing to complete your annual surveillance audits will result in your certification being officially revoked.

Additional Costs

Besides the main implementation options, you should also consider these additional expenses:

Cost Category	Estimated Expense	Description
ISO 27001 Training	$2,500	Professional Lead Auditor or Implementer courses to build internal expertise for managing the ISMS.
Staff Security Awareness	$50 per employee	Mandatory training to ensure all personnel understand and follow new security procedures and policies.
Internal Resources	Variable (Time-based)	The indirect cost of internal staff time dedicated to project management, documentation, and audit preparation.

Internal Resource Costs

Internal resource cost is an intangible cost based on the cost of people’s time to implement the ISO 27001 requirements and then run it.

For most the cost is not doing what they should be doing because they are now doing ISO 27001 related activities.

How to Reduce Your ISO 27001 Certification Costs

• Get the Scope Right: Focus your ISO 27001 certification strictly on the specific products, services, or hosting environments your enterprise customers actually care about. This minimises system complexity and significantly reduces mandatory audit day requirements.
• Take a Do-It-Yourself Approach: Leverage the straightforward structure of the standard to build your management system internally. This completely eliminates the need for expensive consultants or recurring, high-priced SaaS subscription traps.
• Use the High Table ISO 27001 Toolkit: Access all necessary auditor-verified documentation, policies, and expert support at a fraction of traditional consultancy fees to streamline your path to audit success.

ISO 27001 Certification Cost FAQ