How Much Does a Pentest Cost in 2026?

A traditional penetration test costs between £5,000 and £30,000 in the UK in 2026, depending on scope, complexity, and the consultancy used. Infrastructure tests sit at the lower end, complex web application and API tests in the middle range, and full red team engagements at the top. AI-powered pentesting from Revelion starts at £10 per scan, delivering the same depth of security validation at a fraction of the cost.

Traditional Pentest Pricing in 2026

Manual penetration testing from UK consultancies is priced primarily on time and scope. Most engagements are quoted as day rates multiplied by the estimated effort. Senior penetration testers typically bill at £800 to £1,500 per day. A typical web application pentest takes five to ten consultant days, putting most engagements in the £5,000 to £15,000 range.

Infrastructure assessments covering internal networks, firewalls, and server configurations run a similar range, though large environments with many hosts push costs higher. Red team engagements, which simulate a full adversarial campaign including physical access attempts, social engineering, and multi-vector attacks, typically start at £20,000 and frequently exceed £50,000 for complex scopes.

On top of the day rate, most engagements include a fixed fee for scoping, project management, and report writing. This overhead adds £1,000 to £3,000 to nearly every engagement. If you need retesting after remediation, that is an additional £1,500 to £5,000 depending on the firm and scope of retesting required.

Cost Breakdown by Engagement Type

What Drives Pentest Costs

Scope and complexity are the primary drivers. A simple five-page marketing site with no authentication requires far less testing effort than a complex SaaS application with multiple user roles, a REST API, third-party integrations, and a mobile client. Consultancies estimate scope during the scoping call and adjust their quote based on the complexity they expect to encounter.

Compliance requirements add cost. If you need a test conducted to specific methodology standards (CREST, OWASP, PTES, CHECK), the consultancy must document their approach more rigorously, follow specific testing protocols, and produce reports that satisfy those frameworks. CREST-accredited assessments carry a premium because the testers hold specific certifications and follow audited methodologies.

Testing environment access affects cost significantly. If you need the pentest conducted in a staging environment with test accounts provided, setup and coordination time adds to the engagement. If authentication, VPN access, and environment configuration need to be coordinated, expect additional days billed.

Report requirements vary. A standard pentest report with findings, CVSS scores, and remediation guidance is included in most engagements. If you need an executive summary with board-level risk language, a specific report format for an insurance provider, or integration with a ticketing system, additional work is billed at day rate.

Retesting is frequently overlooked in initial budgets. Most consultancies do not include a full retest in the initial engagement. After you remediate findings, you typically pay 30-50% of the original cost to have the fixes validated. For organisations with many findings, retest costs can approach the original engagement cost.

The Hidden Costs Most Budgets Miss

The invoice from the consultancy is not the full cost of traditional pentesting. Internal time spent on scoping, coordination, access provisioning, and stakeholder management can easily add 20-40 hours of staff time per engagement, typically from senior engineers and security leads who have an opportunity cost.

Scheduling delays add another hidden cost. Most reputable consultancies are booked four to six weeks out. If you need a pentest before a compliance deadline or a customer audit, you may need to pay a premium for expedited scheduling, or accept that your audit preparation timeline compresses significantly.

Frequency is the largest hidden cost. A single annual pentest costs £10,000. Quarterly testing would cost £40,000. Monthly testing would cost £120,000. The cost model of traditional pentesting means most organisations drastically under-test, leaving their infrastructure unvalidated for most of the year. The security risk of that blind spot is real, even if it does not appear on a budget line.

AI Pentesting: A Different Cost Model

Revelion's AI-powered pentesting removes the consultant day rate entirely. The platform uses autonomous agents that perform the same depth of testing, reconnaissance, exploitation, vulnerability chaining, proof-of-concept generation, and professional reporting, at a cost determined by compute rather than human time.

The Free plan includes 10,000 credits, enough to run meaningful tests at no cost. The Pro plan at £99 per month provides 125,000 credits, suitable for regular testing of multiple applications. For MSPs managing multiple clients, the MSP plan at £499 per month provides 400,000 credits with a multi-client management portal and white-label reporting.

This changes the decision calculus entirely. Instead of asking “can we afford a pentest this quarter?”, the question becomes “how often should we test?”. Monthly testing, post-deployment testing, and on-demand retesting all become financially practical rather than aspirational.

For organisations considering the ROI of more frequent testing, consider the cost of a single breach: the average cost of a data breach in the UK in 2025 was £3.5 million according to IBM's Cost of a Data Breach report. Against that number, the cost of continuous AI pentesting is negligible. The question is not whether you can afford to test more frequently. It is whether you can afford not to.

Choosing the Right Approach for Your Budget

Traditional manual pentesting and AI pentesting serve different purposes, and the right answer for most organisations is both. Use a manual pentest annually for depth, creativity, and the human intuition that comes from an experienced tester who has seen thousands of applications. Use AI pentesting continuously for the coverage and frequency that manual testing economics make impossible.

If budget constraints mean you must choose one for now, AI pentesting delivers the better security outcome for most organisations: continuous coverage with genuine exploitation over an annual snapshot with an 11-month blind spot. If your primary driver is a specific compliance certification that requires a human-conducted assessment, that changes the calculus.

See how organisations on tight budgets get pentest-quality security with Revelion's flexible pricing. Or learn how MSPs deliver pentesting to clients with margins that actually work.

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