ISO 27001 Cost: What Businesses Need to Know

The cost of implementing an ISMS (information security management system) that meets ISO 27001’s requirements – and achieving certification to the Standard – varies from organisation to organisation.

After all, each ISMS is as unique as the organisation that implements it.

This page looks at the different parts of an ISO 27001 project so you can plan your budget, whatever the size or complexity of your organisation.

Breakdown of ISO 27001 costs

A realistic budget should account for each stage of an ISMS implementation and certification project:

Gap analysis costs

A gap analysis shows how far your current information security arrangements are from ISO 27001’s requirements.

This helps you avoid spending money unsystematically, enabling you to focus on the gaps that matter for certification and prioritise the work appropriately.

For many organisations, this is the most efficient starting point because it gives you a clearer scope, a more accurate budget and a more credible timeline.

For an initial overview of how your current information security practices align with the Standard’s requirements, use our ISO 27001:2022 Gap Analysis Tool.

Our ISO 27001 Gap Analysis service provides an in-person review of the extent to which you meet ISO 27001’s requirements. You’ll then get a report of our findings, detailing compliance gaps and an outline action plan to help you scope your ISMS project.

ISMS implementation costs

Implementation is generally the largest part of the total ISO 27001 cost.

It can include defining your scope, carrying out risk assessments, selecting controls, writing documentation, assigning responsibilities, delivering training, collecting evidence and preparing for audit.

Implementation costs vary widely because some organisations start with mature governance and documentation, while others are building their ISMS almost from scratch.

Internal audit costs

Before certification, your organisation needs to check whether its ISMS is working as intended.

ISO 27001 requires internal audits at planned intervals, so this is both a certification-readiness activity and an ongoing requirement. Some organisations train internal staff to do this.

Others use external specialists to preserve independence and reduce pressure on internal teams.

Certification audit costs

Certification should be carried out by an independent certification body, accredited by a national accreditation body such as UKAS. Read our article Accredited Certification of International Management System Standards to learn more.

The certification audit includes a Stage 1 review of your documented ISMS and a Stage 2 audit to assess whether it has been implemented effectively in practice.

Typical certification audit costs are discussed below.

Ongoing maintenance costs

ISO 27001 certification is typically valid for three years, with annual surveillance audits during that period and a recertification audit at the end of the cycle.

This means you should budget not just for getting certified, but for maintaining your ISMS, updating documentation as necessary, conducting regular internal audits, addressing findings and preparing for surveillance visits.

What drives ISO 27001 cost up or down?

Several factors affect the cost of ISO 27001 certification and implementation.

Organisation size

Larger organisations usually require more audit time, more documentation and more coordination across teams.

Scope complexity

A tightly defined scope is usually quicker and cheaper to implement and audit than a broad scope covering multiple business units, services and environments.

Number of locations

More sites can increase both preparation time and external audit time.

Internal expertise

If you already have people who understand risk assessment, policy writing, internal audit and ISO 27001 requirements, your external support costs may be lower.

Existing documentation and control maturity

Organisations that already have strong policies, technical controls and governance processes in place usually need less remediation work.

Delivery model

A fully in-house project may reduce consultancy spend, but it can increase internal time costs and slow progress.

External support can reduce delays, avoid rework and help teams reach certification faster.

How much does ISO 27001 certification cost?

Your ISO 27001 certification audit fee will usually depend on the size and complexity of your organisation, the number of locations in scope, the maturity of your existing controls and the certification body you choose.

For the initial certification audit alone, many organisations budget on the basis of audit days.

The table below uses recommended ISMS audit time by organisation size, as set out in ISO 27006, and an estimated certification cost based on a typical day rate of £1,250.

Actual fees will vary depending on which certification body you appoint and the risk it associates with your ISMS, so these figures should be used as a guide only.

*According to ISO 27006, the minimum audit duration may be 70% of the recommended time as prescribed by the Standard. Our figures are rounded to the nearest whole day.

How long ISO 27001 takes – and why time affects cost

For many organisations, implementing an ISO 27001 ISMS takes months rather than weeks. The certification audit itself usually takes days rather than weeks. The longer part is the preparation needed to make sure your ISMS is fit for audit.

The timeline depends on your starting point, available resource, decision-making speed and the complexity of the scope. An organisation with mature controls may move quickly, whereas one that needs major policy, process and governance work will usually take longer.

Time matters because delays increase internal cost: the longer a project runs, the more staff time it consumes, the more momentum it loses and the greater the risk of duplicated effort. Faster, better-scoped projects are often cheaper overall, even when they use external support.

With our ISO 27001 FastTrack™ service, you can implement an ISMS in three to six months.

Is ISO 27001 worth it?

For most organisations, yes.

ISO 27001 can help improve information security governance, support customer due diligence, strengthen tender responses and give stakeholders more confidence in how your organisation manages risk.

UK government guidance also recognises certification as an indicator that systems align with information security best practice.

Done properly, ISO 27001 helps organisations build repeatable processes for identifying risks, applying controls and improving over time.

How to reduce ISO 27001 costs

Here are some tips to keep your ISO 27001 costs under control:

Start with a gap analysis

This helps you focus your budget on what actually needs attention.

Scope intelligently

Do not make your scope broader than it needs to be. A well-defined scope can reduce implementation effort and audit time considerably.

Reuse what you already have

Existing policies, processes, risk registers and governance methods may already support parts of the Standard.

Use expert support where it saves time

Consultancy, implementation support and audit preparation can reduce delays and help you avoid expensive mistakes caused by trial and error.

Use proven templates and tools

Templates and toolkits can reduce documentation workload, especially for smaller teams.

Prepare properly before certification

Going into audit too early can create avoidable delays and extra cost.

Guaranteed ISO 27001 certification with GRC Solutions

• We’re the global authority on ISO 27001, having led the world’s first certification project, when the Standard was known as BS 7799.
• Since then, we’ve supported more than 20,000 ISO 27001 projects and have trained more than 7,000 professionals on ISO 27001 implementations and audits.
• We offer everything you need to implement an ISMS – you don’t need to go anywhere else.
• We’ve honed our implementation methodology over more than 20 years and are so confident in its effectiveness that we guarantee certification – provided you follow our advice, that is!
• You benefit from real-world practitioner expertise, not just academic knowledge.
• We have a proven and pragmatic approach to assessing compliance with international standards, whatever your organisation’s size or nature.
• Our pricing and proposals are completely transparent, so you won’t get any surprises.
• Our FastTrack™ service helps organisations prepare for certification in three to six months.

ISO 27001 cost FAQs (frequently asked questions)

How much does ISO 27001 certification cost?

It depends on the size and complexity of your organisation, your scope, your certification body and the amount of audit time required.

What is the difference between ISO 27001 implementation cost and certification cost?

Implementation cost covers the work needed to build and operate your ISMS. Certification cost covers the external audit carried out by an accredited certification body.

Is ISO 27001 expensive for small businesses?

It can be a significant investment, but small businesses can usually reduce cost with a narrow scope, good preparation and the right level of external support.

Do we need ongoing audits?

Yes. ISO 27001 certification is usually valid for three years and normally includes annual surveillance audits, followed by recertification at the end of the cycle.

Can software be ISO 27001 certified?

Not in the usual sense.

ISO 27001 certification applies to an organisation’s ISMS, not to a standalone software product. A software company can be certified, but the certification relates to the management system within the defined scope, not to the product itself.

How long does ISO 27001 take?

That depends on your starting point and scope, but many organisations take several months to prepare for certification. The audit itself normally takes days rather than weeks.