In this guide, I will show you exactly how much ISO 27001 certification really costs. You will get a complete walkthrough of all costs involved.
Table of contents
- The costs breakdown
- ISO 27001 Certification Cost Video
- The things that impact your costs
- ISO 27001 Certification Cost Calculator
- Preparation Costs
- Implementation Costs
- Other Potential Costs
- Internal Costs
- On going costs
- ISO 27001 Audit Costs
- Top 5 ISO 27001 Hidden Costs
- Common Mistakes People Make
- How to reduce your ISO 27001 Certification Costs
- Managing Costs Effectively
- The 2026 Changes to ISO 27001 Certification Costs
- ISO 27001 Certification Cost FAQ
- About the author
The costs breakdown
| Cost Category | Estimated Expenditure | Key Considerations |
|---|---|---|
| 1. Preparation | £300 – £10,000+ | Standard documents (£300) and optional professional gap analysis. |
| 2. Implementation | £500 – £40,000 | Range covers DIY toolkits (£500) vs. full-service consultants (£40k). |
| 3. Staff Training | £50 per person | Critical for cultural compliance and awareness requirements. |
| 4. Official Audits | £1,500 per day | Two-stage certification process based on employee headcount. |
| 5. Internal Audits | £3,500 – £10,000 | Mandatory requirement for maintaining certification validity. |
| 6. Ongoing Costs | ~1/3 of Initial Audit | Annual surveillance audits plus full recertification every 3 years. |
ISO 27001 Certification Cost Video
In this video, ISO 27001 Certification Cost Explained Simply, I will explain the cost of ISO 27001 certification in a simple way. I will show you the real costs and what you should expect to pay.
I have found the main expenses tied to getting certified and how to compare prices. By the end of this video, you’ll know what services you need and what a fair price is for your certification.
The things that impact your costs
ISO 27001 certification costs can vary significantly based on several factors. Getting these factors wrong can lead to a rapid and substantial increase in expenses.
- Organisation Size: Total employee headcount and system complexity directly dictate the mandated audit duration and associated fees charged by the certification body.
- Certification Scope: Clearly defining boundaries for in-scope versus out-of-scope assets can significantly reduce preparation workload and auditor assessment time.
- Number of Locations: Including multiple physical sites within your scope increases costs due to the requirement for additional on-site auditor visits and travel expenses.
- Choice of Certification Body: Selecting between different accredited bodies allows for price comparison, as larger well-known firms typically command higher premium fees.
For a list of reputable options, you can refer to resources on the best ISO 27001 certification companies, the best ISO 27001 certification companies.
ISO 27001 Certification Cost Calculator
| 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 |
| 426 – 625 | 16.5 | £23,125 |
| 626 – 875 | 17.5 | £24,375 |
| 876 – 1175 | 18.5 | £25,625 |
| 1176 – 1550 | 19.5 | £26,875 |
| 1551 – 2025 | 21 | £28,125 |
| 2026 – 2675 | 22 | £29,375 |
| 2676 – 3450 | 23 | £30,625 |
| 3451 – 4350 | 24 | £31,875 |
| 4351 – 5450 | 25 | £33,125 |
| 5451 – 6800 | 26 | £34,375 |
| 6801 – 8500 | 27 | £35,625 |
| 8501 – 10700 | 28 | £36,875 |
ISO 27001 certification costs typically range from £6,250 for small organisations (1–10 employees) to £36,875 for large enterprises (8,500+ employees), based on the mandated audit days defined in ISO 27006 and a standard daily rate of £1,250.
How Certification Costs Are Calculated
The number of audit days is usually based on how many employees you have. While it may seem like a simple metric, this is the guidance certification bodies use to calculate costs. This approach is standard across all organisations that offer ISO 27001 certification. The guidance is provided in the ISO/IEC 27006-1:2024 standard, which outlines the requirements for bodies that audit and certify information security management systems.
ISO 27001 Certification Guaranteed
Preparation Costs
| Preparation Item | Cost (GBP) | Purpose & Deliverable |
|---|---|---|
| ISO 27001:2022 Standard | £150 approx. | The core blueprint for the Information Security Management System (ISMS). |
| ISO 27002:2022 Standard | £150 approx. | Detailed guidebook for implementing Annex A security controls. |
| Professional Gap Analysis | £3,500 – £10,000 | Expert assessment to identify compliance gaps before the official audit. |
| DIY Gap Analysis | £0 (Internal Resource) | Self-assessment using internal expertise or toolkits to map current state. |
| Total Preparation Budget | £300 – £10,300 | Combined estimate for the discovery and planning phase. |
Implementation Costs
The costs to implement ISO 27001 can vary widely depending on how you do it.
| Implementation Method | Estimated Cost | Typical Duration | Key Deliverables & Risks |
|---|---|---|---|
| Do It Yourself (Toolkit) | £500 | 30 to 90 days | Includes all templates, policies, and guides. Validated track record of delivery. |
| Consultant | £5,000 – £40,000 | 6 to 12 months | Includes templates and guidance with a proven track record, but at a higher premium. |
| Internal Employee | £40,000+ per year | 6 to 12 months | Requires writing all policies from scratch. Implementation speed is often uncertain. |
| External Contractor | £40,000 – £160,000 | 6 to 12 months | Will write all policies with expert focus, but represents the highest cost tier. |
ISO 27001 Toolkit
All the templates, tools, support and knowledge you need to do it yourself.
Other Potential 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 Costs
The biggest hidden cost you’ll face is the cost of internal resources. In my experience, this is also the most often overlooked cost.
It’s hard to guess the exact cost of your team’s time, but the loss of productivity is often your highest expense. The impact of ISO 27001 affects the whole company and requires changes to daily operations. This means your employees will inevitably spend less time on their main job duties. This represents both a culture change and an operational change for the entire company.
On going costs
- Full-time Internal Resource: A dedicated internal headcount responsible for the ongoing management of the ISMS typically costs between £40,000 and £60,000 annually.
- External Consultant: Retained specialist support to maintain compliance and prepare for surveillance audits generally ranges from £12,000 to £36,000 per year.
- Existing Staff Training: Upskilling current employees to manage security controls and system updates requires an estimated annual budget of £2,000 to £5,000.
- Surveillance Audits (Years 1 & 2): Mandatory annual third-party audits to verify continued adherence to the standard typically cost approximately 33% of the initial certification fee.
- Recertification Audit (Year 3): A full strategic audit required every three years to renew the certification often incurs fees equivalent to 100% of the initial assessment cost.
- Independent Internal Audits: Recurring mandatory self-audits performed by an expert independent of the audited areas come with variable costs depending on provider rates.
ISO 27001 Audit Costs
This guide covers the costs associated with ISO 27001 audits, including both internal and annual certification audits. We’ve previously discussed the total certification cost, but other audits are also necessary.
| Audit Phase | Estimated Cost (GBP) | Description & Frequency |
|---|---|---|
| Certification Audit (Total) | £1,000 – £50,000 | Total external cost for achieving certification based on size and complexity. |
| Stage 1 & 2 Audit | £6,250 – £40,000 | Initial assessment phases: documentation review and operational testing. |
| Internal Audit | £3,500 – £10,000 | Annual mandatory review conducted by independent external specialists. |
| Surveillance Audit | £3,000 – £10,000 | Annual check-in audits required to maintain certification status. |
The list of the best ISO 27001 certification companies.
Lets’s break down the audit costs in a little more detail so you can understand them.
Internal Audit
An ISO 27001 certification requires internal audits. You must perform at least one complete internal audit before you can go for the official certification audit.
An ISO 27001 audit has two requirements: the person conducting the audit must be independent of the area being audited, and they must be qualified to perform audits. While you can do this yourself with some restrictions, most people prefer to hire outside help.
ISO 27001 Certification Audits
The ISO 27001 certification process includes two separate audits. The cost is based on the number of employees you have. The first audit, known as the Stage 1 audit, is where the auditor reviews your information security management system and all related documents.
The Stage 2 audit is a practical demonstration. You will show the auditor your security controls and provide real examples of how they work.
Once certified, your certificate is valid for three years. However, you’ll need to pass annual surveillance audits to keep it. These audits are a recurring cost that many people don’t consider when budgeting.
ISO 27001 Surveillance Audits
Surveillance audits are the yearly check-ups needed to maintain your ISO 27001 certification. Each year, until your re-certification audit, a certification body will conduct a small audit to ensure that your management system is still working effectively.
The cost of a surveillance audit is typically about a third of the cost of your initial certification audit. This is a mandatory requirement, and if you fail to complete it, your certificate will be revoked.
Questions?
Top 5 ISO 27001 Hidden Costs
The following are the hidden costs that people do not consider when implementing ISO 27001
| Cost Category | Financial Impact & Impact Details |
|---|---|
| Annual Internal Audits | Professional independent auditor fees (£3,500+) plus significant staff time to facilitate mandatory yearly reviews. |
| Surveillance Audits | Mandatory annual external “check-up” audits typically costing approximately one-third of the initial certification fee. |
| Recertification Fees | Comprehensive strategic audits required every three years, often incurring fees comparable to the original assessment. |
| Internal Productivity | The high opportunity cost of staff time diverted from revenue-generating duties to update and evidence the ISMS. |
| Software & Training | Recurring platform license fees and additional expenditure for specialised training to operate compliance tools. |
Common Mistakes People Make
Based on my experience, people often make these mistakes regarding the cost of ISO 27001 certification.
- Lack of Understanding: Organisations often overspend by following expensive marketing hype rather than assessing their actual needs and the relative simplicity of implementation options.
- Failing to Compare Prices: Many businesses incorrectly assume all certification bodies charge similarly; obtaining at least three quotes from accredited providers ensures you find the best financial and strategic fit.
How to reduce your ISO 27001 Certification Costs
I specialise in helping people do ISO 27001 themselves and having helped over 5,000 organisations get ISO 27001 certified, these are my expert tips for reducing costs:
- Get the scope right: Focus your ISO 27001 certification strictly on the specific services your customers require to minimise complexity and significantly reduce audit day requirements.
- Do It Yourself: Leverage the straightforward nature of the ISO 27001 standard to implement your management system internally, eliminating the need for high-cost consultants or complex software platforms.
- Utilise the HighTable ISO 27001 Toolkit: Access all necessary documentation, training, and expert support at a fraction of traditional consultancy costs to streamline your path to certification.
Managing Costs Effectively
The good news is that businesses can take active steps to manage the financial impact of ISO 27001. Defining the certification scope carefully, leveraging an ISO 27001 toolkit, and handling parts of the process in-house can reduce reliance on expensive consultants.
Comparing quotes from different certification bodies also ensures you’re not overpaying for the same outcome—your ISO 27001 certificate.
Ultimately, while certification involves investment, the credibility and assurance it brings are invaluable. Organizations that achieve ISO 27001 certification are better positioned to win contracts, satisfy stakeholders, and demonstrate a clear commitment to safeguarding information. To explore how this could work for your business, you can claim a free strategy consultation and get tailored guidance for your certification journey.
The 2026 Changes to ISO 27001 Certification Costs
In 2026, the average cost of ISO 27001 certification in the UK has reached a new baseline of £1,500 per auditor day. This reflects a 20% increase over 2025 rates, largely driven by the scarcity of UKAS-accredited auditors and the increased complexity of the ISO/IEC 27001:2022 transition.
Because certification bodies calculate total fees by multiplying mandated “audit days” (governed by the ISO 27006 standard) by their current daily rate, this shift significantly impacts the budgeting requirements for any organisation seeking initial certification or recertification this year.
ISO 27001 Certification Cost FAQ
The cheapest route is the ‘DIY with Toolkit’ method. You buy a proven toolkit for around £500 and implement the controls yourself using internal resources. You then pay only the unavoidable certification body fees (£6,250+). This avoids the £15,000+ consultancy fees and the £12,000/year recurring costs of SaaS platforms.
For a small business (under 10 employees), the minimum budget required is approximately £6,750 for Year 1. This includes the mandatory UKAS accreditation fee (approx. £6,250) and a DIY Toolkit (approx. £500). If you hire consultants, this cost will easily triple to over £18,000.
In 2026, the total cost for ISO 27001 certification in the UK typically ranges from £6,250 for small organisations (1–10 employees) to over £50,000 for large enterprises. This figure is calculated based on the daily auditor rate (average £1,250/day) multiplied by the number of audit days mandated by ISO 27006.
The official ISO/IEC 27001:2022 standard document is not free. You must purchase it from BSI or ISO.org, typically costing between £120 and £160 depending on the currency and provider. You will also likely need ISO 27002, which costs a similar amount. Budget ~£300 for these foundational documents.
Yes, funding is sometimes available through Innovate UK vouchers or regional Cyber Local grant schemes (like the 2025/26 Cyber Local funds), which can cover up to £5,000 of consultancy or audit fees. Check your local Growth Hub, as these grants are region-specific and often require matched funding.
A qualified ISO 27001 consultant in the UK charges between £800 and £1,500 per day. For a full implementation project, you should budget for at least 15 to 20 days of their time, bringing the total consultancy fee to between £12,000 and £30,000, excluding the actual audit fees.
It can be expensive if managed poorly, but it doesn’t have to be. While a £20,000 consultancy bill is too high for most startups, a lean DIY implementation costing around £7,000–£8,000 (total) is manageable and often required to close enterprise deals. The return on investment usually comes from a single closed contract.
Beyond the initial certification audit fees, organisations must budget for annual surveillance audits (approx. 33% of the initial fee), staff training (£50–£2,500), penetration testing (£3,000+), and the internal opportunity cost of staff time dedicated to maintaining the ISMS.
A professional penetration test required for ISO 27001 compliance typically costs between £3,000 and £8,000 per year. The price varies based on the number of IP addresses, the complexity of your web applications, and whether you require a ‘black box’ or ‘white box’ test.
No, ISO 27001 does not strictly mandate hiring a full-time dedicated security officer, but it does require clear ownership of the Information Security Management System (ISMS). For small businesses, this role is often absorbed by a CTO or Operations Director. However, the opportunity cost of their time (approximately 2–3 months part-time) must be budgeted for. Larger organisations often hire a dedicated manager, which adds £40,000–£60,000 to the annual budget.
A Virtual CISO (vCISO) is a cost-effective alternative to a full-time hire, typically costing between £1,500 and £4,000 per month depending on the service level. This provides you with expert board-level security guidance and audit support for a fraction of the £60k+ salary of a dedicated employee.
For a solo consultant or single-person company, the cost is the absolute minimum allowed by accreditation rules. You will pay approximately £6,000 for the audit (the minimum 5 days cannot be reduced further without special deviation) plus £300 for standards. Total Year 1 cost: ~£6,300. There are no ‘freelancer discounts’ on UKAS audit fees.
SOC 2 is generally more expensive than ISO 27001. A typical SOC 2 Type 2 audit costs £20,000–£30,000 annually, whereas ISO 27001 surveillance audits cost significantly less (approx. £3,000–£5,000). However, if you do them together in an ‘Integrated Audit’, you can save about 30% on the combined fees.
Yes, there are annual fees. You must pay for a ‘Surveillance Audit’ in Year 1 and Year 2 to keep your certificate valid. These audits typically cost 33% of your initial certification fee. In Year 3, you pay for a full ‘Recertification Audit’, which costs roughly the same as your initial audit.
Yes, using an ISO 27001 Toolkit is significantly cheaper, costing approximately £500 as a one-off fee compared to £5,000–£40,000 for a consultant. Over a three-year cycle, a toolkit approach can save a micro-business up to £18,000 compared to using subscription-based compliance platforms.
Formal training varies by level. A 5-day Lead Auditor course costs around £2,200–£2,500. A 3-day Internal Auditor course costs roughly £1,500. For general staff awareness, expect to pay around £30–£50 per employee per year for online training platforms.
If you fail the Stage 2 certification audit due to major non-conformities, you will likely incur re-audit fees. Certification bodies typically charge their standard daily rate (£1,250 in 2026) for the time required to review your corrective actions. This can range from a half-day desktop review (£625) to a full on-site re-audit depending on the severity of the failure.
No, you cannot obtain an accredited ISO 27001 certificate for free. While you can implement the security controls yourself at little to no direct cost (using free resources or internal knowledge), the actual certification must be issued by a UKAS-accredited body, which charges mandatory audit fees starting at £6,250. Be wary of ‘free certification’ offers; they are usually unaccredited self-declarations that hold no commercial value.
es, Cyber Essentials Plus is significantly cheaper, typically costing between £1,500 and £2,500 for the assessment. However, it is a UK-specific technical standard, whereas ISO 27001 is a globally recognised management standard. For international contracts, Cyber Essentials Plus is rarely accepted as a substitute for ISO 27001.
In Year 1, Vanta (approx. £12,000) is generally cheaper than a full consultant (£20,000+). However, Vanta is a subscription, meaning you pay that £12,000 every single year. A consultant is a one-off fee. Over a 3-year period, a consultant might actually be cheaper than Vanta, but a DIY Toolkit remains the cheapest option by far (£500 one-off).
If you cancel your subscription to a platform like Drata or Vanta, you effectively lose your ISMS. Most platforms do not allow you to export your data in a usable, audit-ready format. To maintain your certification, you would need to urgently rebuild your entire management system from scratch in Word or Excel, costing you significant time and money.
No. GRC platforms are ‘preparation tools’, not ‘certification bodies’. Even if you pay Vanta £12,000/year, you must still hire a separate, accredited UKAS auditor to perform your Stage 1 and Stage 2 audits. You must budget for both costs, not just one.
Yes. Beyond the base subscription, many platforms charge extra for ‘additional frameworks’ (e.g., adding GDPR or SOC 2), ‘extra seats’ for employees, and ‘integration fees’ for connecting to your tech stack. Additionally, renewal fees often increase by 10-20% after the first year discount expires.
Usually, no. While some GRC platforms offer ‘bundled’ penetration tests via partners, this is often an add-on cost of £3,000–£5,000 per year. Do not assume the base license fee covers the mandatory technical testing required by Annex A 8.8.
Most GRC platforms use a ‘per-seat’ or tiered pricing model. While Year 1 might cost £12,000 for 20 employees, doubling your headcount to 40 can trigger a price jump to £18,000+ upon renewal. Unlike a fixed-price Toolkit, SaaS costs act as a tax on your growth, increasing purely based on headcount rather than complexity.
Yes, some certification bodies charge a ‘Platform Surcharge’ (typically £500–£1,000) because auditing inside a proprietary software tool can take longer than reviewing standard documents. You must check if your chosen auditor is familiar with your specific platform before booking, otherwise, you may face unexpected daily rate overages.
Yes. Being ‘Cloud Native’ means you do not have to secure physical data centres, which significantly reduces the scope of your Physical Security audit (Annex A 7). This can reduce your on-site audit days by 0.5–1 day, saving you £600–£1,250 in audit fees compared to an on-premise business.
Yes, conducting audits remotely eliminates the auditor’s travel, accommodation, and subsistence expenses, which can save between £500 and £2,000 depending on your location. The actual audit day rate remains the same (£1,250), but the ‘expenses’ line item on your invoice disappears.
The Stage 1 audit typically represents about 20-30% of the total certification fee. For a small business with a total fee of £6,250, the Stage 1 audit would cost approximately £1,250 to £1,875. This is primarily a documentation review to check readiness.
The Stage 2 audit is the main certification event and represents 70-80% of the total fee. For a small business, expect to pay between £4,375 and £5,000. This audit is longer and involves the auditor testing your actual controls and gathering evidence.
Recertification occurs every 3 years and requires a full audit, similar to your initial Stage 2. The cost is generally equal to or slightly less than your initial certification fee. In 2026, budget at least £6,000–£8,000 for this mandatory triennial event.
A professional gap analysis by a consultant costs between £2,500 and £5,000. However, you can perform a DIY gap analysis for free using a checklist or toolkit, which identifies missing controls without the high consultancy price tag.
Yes, under ISO 27006 rules, you can potentially reduce audit days by up to 30% if you have a very limited scope, minimal staff, or simple IT architecture. However, this must be justified to the certification body. Removing physical locations from your scope is the most effective way to legally reduce mandatory audit days and costs.
Yes, significantly. Under ISO 27006 rules, auditors must visit a square root of your total sites. Each additional site adds travel expenses and auditor days to your quote. To reduce costs, define your scope smartly—often, only your HQ needs to be in scope.
Yes. If you operate multiple sites with identical processes (e.g., retail branches or satellite offices), ISO 27006 allows auditors to visit only the square root of the total number of sites. For example, if you have 9 offices, the auditor may only need to visit 3 (√9), significantly reducing your total audit days and travel fees.
If you are already doing ISO 27001, adding ISO 42001 (Artificial Intelligence Management) typically costs an additional £3,000–£6,000 in audit fees (Integrated Audit). Doing them separately would double the cost. The implementation overlap is roughly 40%, saving significant resource time compared to starting from scratch.
Generally, ISO 27001 costs are considered a revenue expense (tax-deductible) rather than capital expenditure, meaning they can reduce your corporation tax bill. Additionally, if the certification is vital for an R&D project (e.g., developing secure AI), parts of the implementation cost might be claimable under R&D Tax Credits. Always consult your accountant.
No, you do not need expensive enterprise tools. Most small businesses can meet all ISO 27001 technical controls using the features already included in Microsoft 365 Business Premium or Google Workspace Enterprise. Implementing native tools like Intune (MDM) and Defender is often sufficient and avoids additional software license costs.
Absolutely. You do not need a consultant to implement the standard. With a good toolkit and basic project management skills, you can build the ISMS yourself. The only part you cannot do yourself is the certification audit, which must be done by an external accredited body.
About the author
