How Much Does A Pen Test Cost?

Pen testing is a critical security measure, helping organisations identify and validate exploitable vulnerabilities before cybercriminals do. However, one of the most common questions we hear is:

How Much Does a Pen Test Cost?

The answer depends on several factors. While pen testing was once considered expensive and unpredictable, modern approaches such as Continuous Pen Testing and Pen Testing as a Service (PTaaS) have made it more accessible than ever.

Below, we break down the 5 key factors that determine pen testing costs, along with the value it provides.

1. Scope of the Pen Test

The size and complexity of the system being tested significantly impact cost.

A simple website pen test is typically more affordable than a full network penetration test or web application penetration test covering multiple assets.

Typical scope considerations include:

• Website Pen TestFocused on identifying vulnerabilities in public-facing websites, such as poor authentication, outdated plugins, and misconfigured security headers.
• Web App Pen TestingA more comprehensive assessment of dynamic web apps (including APIs), targeting logic flaws, insecure data handling, and authorisation weaknesses.
• Network Pen TestingCovers both internal and external infrastructure, identifying risks like exposed ports, outdated systems, and weak access controls.

The broader the scope, the more time and expertise required, influencing pricing accordingly.

2. Cost of One-Off vs. Continuous Pen Testing

Traditional pen testing is often conducted as a one-off engagement, meaning you get a snapshot of your security posture at a specific point in time. However, vulnerabilities evolve constantly, making periodic testing essential.

Continuous pen testing spreads costs over time while ensuring ongoing security visibility. This model provides ongoing exploitable vulnerability assessments, regular updates, and actionable insights.

Traditional vs. Continuous Pen Testing

For a network with 250 IPs and 5 web applications, a traditional pen testing approach would typically cost around £15k for a one-off assessment.

In contrast, a continuous pen testing service combining skilled human expertise with automation provides monthly pen testing for £1.3k, offering a more cost-effective and always-on approach to cyber risk management.
‍
One-off pen test: 250 network IPs and 5 web apps, £15k. A single snapshot at one point in time.
Continuous pen testing: 250 network IPs and 5 web apps, £1.3k per month. Monthly testing, combining automation with human expertise.
‍
In other words, for roughly the same price as a one-off traditional pen test, a continuous pen testing service would deliver 12 pen tests, often levelling the playing field against adversaries that refuse to go away!

3. Automated vs. Manual Testing

The methodology used also influences cost:

• Automated Pen TestingUses tools to scan for known vulnerabilities. It's faster and more affordable but lacks depth.
• Manual Pen TestingEthical hackers mimic real-world attacks to uncover deeper threats.
• Hybrid ApproachCombining automation with expert analysis for better accuracy.

While fully automated testing is cheaper, manual testing delivers greater security assurance - especially for complex environments.

4. Compliance and Industry Requirements

Regulated industries such as finance, retail, and healthcare often have specific security standards that affect pen testing costs. Organisations required to comply with UK GDPR, PCI DSS, ISO 27001, and Cyber Essentials may need more detailed assessments.

Higher compliance demands typically result in:

• Cyber risk assessments that validate security posture.
• Risk assessments in cyber security to ensure regulatory alignment.
• Cyber security consulting for ongoing compliance management.

5. The Cost of NOT Testing

Many organisations focus on the cost of pen testing but overlook the hidden cost of not testing:

• Data breaches can lead to significant reputational damage and financial losses. The average cost of a data breach in the UK has reached £3.58M.
• Regulatory non-compliance can result in severe penalties, with UK GDPR fines reaching up to £17.5M or 4% of global turnover.
• Operational downtime from cyber-attacks results in lost revenue and brand harm, with ransomware attacks costing businesses an average of £100k in downtime alone.

Investing in continuous pen testing today prevents costly cyber incidents tomorrow.

Pen Testing as an Investment

Rather than viewing pen testing as an expense, organisations should see it as an investment in cyber risk management, compliance, and business resilience. The shift to continuous pen testing makes security more cost-effective, predictable, and valuable than ever before.