ISO 27001 is the international standard for building an information security management system (ISMS). It is jointly published by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). The standard provides a framework of policies, procedures, and security controls that help businesses protect sensitive data.
Earning an ISO 27001 certification isn’t cheap. A company needs to pay for a multi-day audit by accredited experts, and it also has to invest in security measures, staff time, and documentation. Total ISO 27001 costs for the first year usually range between $8,000 and $100,000 depending on the company’s size and how much work is done in-house
In this article, we’ll cover:
- Factors driving ISO 27001 costs Learn about the elements that influence implementation costs, including factors like company size and the use of external consultants.
- A full breakdown of ISO 27001 costs Before planning a budget, reviewing your financial breakdown is crucial, with expense categories for preparation, implementation, and maintenance phases.
- Company size and cost implications See how the size of your company affects certification costs and get a ballpark figure for your ISO 27001 project.
What factors influence the ISO 27001 certification cost
The average ISO 27001 cost varies by company and industry. However, a few common factors always influence how much organizations will need to spend.
Key things to consider include:
- Company size Larger organizations usually operate more complex IT systems. The price of achieving security compliance goes up with the number of devices, data centers, and network users.
- The number of locations Having many locations means a higher ISO 27001 cost. Security teams must secure all physical sites and remote work settings while keeping policies consistent in all locations. Every location needs a thorough audit.
- ISMS maturity If a company already has a strong security setup, complying with ISO 27001 standards will be much faster and easier.
- The nature of information processing Organizations that process sensitive data must spend more on security controls and policies. Since an ISO 27001 certification is risk-based, the costs go up as information security risks increase.
- In-house expertise Teams with highly skilled staff often spend less on ISO 27001 compliance. They can use their own talent for setting up security measures and risk assessments so there is no need to bring in external audit experts.
- ISMS scope. Every business has different strategic goals. Some may want to build an ISMS that will handle future growth or adapt to the cloud. The scope of information security management plays a key role in determining the cost of ISO 27001 certification.
- Leadership When executives are committed to the ISO 27001 certification, the costs are lower. That is because they plan better, understand their responsibilities, and hire the right external experts at the right time during the certification process.
3 paths to ISO 27001 compliance
There are 3 ways to achieve ISO 27001 compliance. Each of these paths can get you to certification, but they differ in terms of the time you spend, who carries the load, and the final cost.
1. DIY (do it yourself)
In this scenario, your team handles everything. Here is what they do:
- Define the ISMS scope
- Run a risk assessment
- Write policies and procedures
- Prepare the Statement of Applicability
- Build the risk management plan
- Train staff
For context, the Statement of Applicability (SoA) is a mandatory document that lists the controls that an organization has deemed necessary, states their inclusion or exclusion, and notes their implementation status.
On paper, a DIY approach looks inexpensive because there are no consulting fees. But you’re paying with your team’s time, and that gets expensive for senior staff. For example, if a lead engineer manages the ISO 27001 compliance project, they might spend 2–4 months on it. At an annual salary of around $125,000 that’s roughly $20,833–$41,666 for the prep stage alone
This choice makes sense only if your employees are governance, risk management, and compliance (GRC) experts. But for most companies, it’s the most expensive option once you count the total costs. Your staff could be shipping a new product or improving operations instead of building an ISMS from scratch.
2. External consultant
Bringing in an ISO 27001 consultant is expensive, but it is often a smart move, especially for organizations with small security teams or no prior ISO experience. For them, hiring a consultant often ends up cheaper than DIY
A consultant helps you:
- Define and refine the ISMS scope
- Assess the risks
- Draft and align policies, procedures, and controls
- Prepare your Statement of Applicability and risk treatment plan
- Run or support the internal audit so you’re ready for the certification body
Consulting fees for this stage are around $500–$1,250 per day or up to $40,000 for the whole process. The benefit of hiring an external expert is that your internal senior staff spend far less time on the ISO 27001 documentation and audit preparation, and can focus on their jobs.
3. Compliance automation platform
A compliance platform takes a different approach to ISO 27001 compliance. It reduces the amount of manual work required to obtain the certification. Such a platform typically helps by:
- Automating evidence collection
- Managing tasks and workflows
- Providing templates for ISO 27001-aligned policies and controls
- Using checklists to walk you through the audit
If your head of engineering or another senior technical leader is running the ISO 27001 project, using a platform can cut their time considerably. Instead of spending 4 months on ISO readiness (at a cost of around $41,666 in internal time), they might need about 4 weeks. Add a platform subscription of about $5,000–$24,000 a year, and you get the lowest-cost option
How much does ISO 27001 certification cost?
It is almost impossible to give one specific price for an ISO 27001 certification that applies to every organization. These costs depend on a company’s size and the maturity of its security setup.
Usually, the audit alone will cost you between $14,000 and $16,000. Most audit bodies tend to charge around $1,500 for every day they are on-site
The external audit is only one part of the total ISO 27001 cost. Organizations must also pay for ISMS preparation, gap analysis, internal audits, staff time, consultant support, training, technical controls, and compliance software.
An ISO 27001 certification also creates ongoing costs During the 3-year certification cycle, organizations must maintain their ISMS and conduct internal and external surveillance audits. Then there is a recertification audit required before the original certificate expires.
If you add up every direct and internal expense, the total bill for getting and keeping ISO 27001 certification over 3 years can top $100,000 This is especially true if you need external consultant support, new security tools, or major changes to your security setup.
The table below compares the costs of the ISO 27001 certification in 2026 depending on company size:
Company size | Annual spend | What the costs cover |
|---|---|---|
Under 25 employees self-led with a documentation toolkit | $8,000–$25,000 | Certification body audit, toolkit, basic testing, internal work |
25 to 200 employees | $25,000–$60,000 | Audit, consulting, compliance platform subscription, penetration testing, and staff training |
+200 employees | $60,000+ | Large audit scope, dedicated staff, multiple locations |
If you carefully define the certification scope, you can reduce costs by limiting the assets included and shortening preparation and audit time.
Preparation costs
Getting ready for ISO 27001 costs about $40,000, but that number can fluctuate depending on several factors.
First, you must buy the ISO 27001 standard itself. A single-user PDF license costs between $180 and $280, depending on where you purchase it. If a company has a weak ISMS to start with, prep costs will be much higher. In those cases, the business needs to:
- Create a library of information security policies
- Train staff on how to follow ISO 27001 standards
- Apply access controls to sensitive data
- Encrypt data in storage and in transit
- Implement physical security controls
- Develop risk assessment systems and create a risk management plan
- Carry out or commission an internal audit
- Set up monitoring systems and schedule regular surveillance audits
All of this takes time and money. However, the biggest preparation costs often involve hiring external experts. There are 3 main ways an independent consultant can help with ISO 27001 preparation:
Gap analysis
This is a comparison of what you have now versus what ISO 27001 requires. It helps you figure out the project’s size and how long it will take. Budget between $5,000 and $15,000 for this.
Vulnerability assessments
These target specific security issues and recommend mitigation actions. Methods like penetration testing provide an overview of your data security practices, making the risk assessment process easier. Costs vary from $5,000 for basic vulnerability assessments to $40,000 for network-wide penetration testing.
Internal audits
You need internal audits to make sure you are ready before the official ISO 27001 auditors show up. Consultants usually charge around $1,500 a day for this service.
Implementation costs
Project teams must share policies with all relevant users and train the staff. They also must implement controls according to Annex A of ISO 27001 and check that these controls protect critical information.
- Security-awareness training The price of training varies according to the number of employees and their baseline level of expertise. For a 30-person company, the cost is about $1,500 for the whole team.
- Technical controls Companies may need to install threat detection software, firewalls, or access management systems. The cost of these tools can reach $10,000.
- Compliance expertise Hiring a full-time compliance professional to oversee the ISO rollout can add $70,000–$100,000 per year in salary costs to your annual budget.
- Productivity costs When you have to pull your best people away from their jobs to work on ISO 27001, productivity can drop for months. The cost of these early-stage growing pains is hard to evaluate, but it is real.
Maintenance costs
ISO 27001 is not a set-it-and-forget-it system. You have to stay compliant continuously which keeps the cost high. It varies by organization, but you can expect to spend $10,000–15,000 annually on policy updates and surveillance.
That includes the external surveillance audits in years 2 and 3, which cost about $7,500. You also have to perform your own internal audits, costing an additional $5,000–$7,500 annually.
Maintenance bills can also spike in some situations. For example, if you merge with another business, change how you process data, or face new laws, you might have to overhaul your ISMS. When that happens, auditors have to check everything again.
Making your staff aware of security is another part of the ISO 27001 certification process. Refreshing their knowledge and building a security culture is hard to quantify, but it adds thousands to the total cost.
ISO 27001 stage 1 and stage 2 audit costs
ISO 27001 certification audits are typically split into 2 phases:
- Stage 1 documentation review
- Stage 2 full certification audit, including testing of controls and interviews
Once you know the cost of each stage, planning your budget gets a lot easier.
Stage 1: documentation review audit costs
During stage 1, the certification body goes through your ISMS files to make sure your scope and internal rules are actually in line with ISO 27001. Auditors will check that you’ve:
- Defined your ISMS scope
- Documented your risk assessment and treatment processes
- Produced the required documents, like the Statement of Applicability
- Set up your security policies and procedures
This part of the audit usually lasts 1–2 days Since daily rates are often near $1,500 the total cost for stage 1 typically lands between $1,500 and $3,000 It depends on the size of your scope and the specific prices the auditors charge.
Stage 2: the full certification audit costs
This is the primary part of the certification process. During stage 2, auditors check whether your ISMS works in practice. They’ll look for proof that your risk treatment actions are being carried out and observe how your controls work day-to-day. They also review incident management, staff training levels, and how well you meet Annex A and legal requirements.
The total price of a stage 2 audit depends on how large the company is An external auditor simply needs to spend more time at a bigger organization.
For a 50-person business with a moderate ISMS scope, stage 2 usually lasts 6–9 days on-site If we use that same $1,500 daily rate example, stage 2 would typically cost between $9,000 and $13,500
ISO 27001 surveillance and recertification audit costs
An ISO 27001 certificate follows a 3-year cycle After your initial audit (stages 1 and 2), you’ll have surveillance audits in years 2 and 3. To maintain certification, you must complete a recertification audit before your certificate expires at the end of the 3-year cycle.
Surveillance audits (years 2 and 3)
Surveillance audits are like health checks for your ISMS. During these visits, auditors check that:
- Your ISMS is working well
- You’re still managing risks and fixing issues as they come up
- Security controls are being updated as your business environment changes
These audits don’t usually take as long as the first one. For a company with 50 employees, you’re likely looking at 2–3 audit days each year Since daily rates usually remain around $1,500, the total annual cost often lands between $12,000 and $15,000 once you include administrative and certification body fees.
Recertification audit (year 4)
You have to go through a recertification audit at the end of the 3-year period to keep the certificate. This process is more thorough than a yearly audit but is often easier than the initial certification, provided your ISMS is stable.
For most companies, recertification audit costs are between $14,000 and $16,000 similar to the initial audit expenses. That cost can change based on several factors, like whether you’ve expanded the scope of the ISMS, moved to new cloud platforms, or how the specific certification body sets its prices.
When you look at the total for surveillance and recertification alongside the stage 1 and stage 2 costs, it’s clear that ISO 27001 is a long-term commitment, not just a one-off payment.
How can you reduce ISO 27001 certification costs?
You can reduce ISO 27001 certification costs through careful preparation and a strong implementation plan.
Do more work in-house
If your team has the right skills and enough time, you can manage the setup yourself without hiring outside consultants See whether staff members are able to build the ISMS, run risk assessments, and write policies or security metrics. Taking care of internal audits on your own cuts down on professional fees but it still demands a lot of time and specific knowledge from your employees.
Use existing templates and training
You do not need to create every policy, process, or document from scratch. Using implementation guides, templates, and staff training can help your team get through the standard tasks much faster. Still, make sure these materials match the specific risks and systems your organization uses.
Focus on essential requirements
A detailed gap analysis can identify which controls, documents, and processes are missing. This helps your team focus on what’s needed for the certification instead of wasting energy on things that don’t matter. However, you’ll still need to buy and study the official ISO standards to ensure your ISMS meets all the rules
Technology can help with access controls, encryption, network activity monitoring, and security oversight. Learn how NordLayer’s ISO 27001 solutions can support your compliance efforts.
Disclaimer: The costs and timelines mentioned in this article are illustrative estimates only. Actual ISO 27001 certification costs may vary depending on factors such as an organization’s size, scope, location, certification body, consultant rates, and audit requirements.