How Much Does a Penetration Test Cost in the UK? (2026 Pricing Guide)

How much does a penetration test cost in the UK?

If you've been quoted £8,000 for a penetration test and wondered whether that's normal — it is. But it's not the only option anymore, and for most small and medium-sized businesses, it's not the right one either.

This guide covers what penetration testing actually costs in the UK in 2026, what drives the price, and how to decide what level of testing your business actually needs.

The honest price range for UK penetration testing

Traditional penetration testing in the UK costs between £5,000 and £20,000 for a web application engagement. Enterprise-level red team assessments can reach £75,000 or more. These figures come from CREST-accredited firms and reflect the cost of a security consultant's time — typically two to five days of manual testing, plus report writing.

That pricing made sense when there was no alternative. It does not make sense for a small business running a Shopify store, a law firm with a client portal, or a startup that just wants to know whether their site can be compromised before a customer finds out.

What you're actually paying for in a traditional pentest

A conventional penetration test involves a security professional manually probing your site over several days. They attempt SQL injection, cross-site scripting, authentication bypasses, and dozens of other techniques. At the end, they write a report explaining what they found and how to fix it.

The process is thorough. It is also expensive because human time is expensive, scheduling takes weeks, and the firms that do it well carry significant overhead — certifications, insurance, senior staff.

For businesses that need CREST certification for a specific contract or regulatory obligation, that level of engagement is necessary. For everyone else, it is often overkill.

Why automated penetration testing changes the calculation

In the last two years, automated security testing has reached a point where it can run the same checks a manual tester would perform in a fraction of the time. Not all of them — complex business logic flaws and chained multi-step exploits still benefit from human expertise. But the core OWASP Top 10 checks, authentication testing, header analysis, injection probes, and subdomain enumeration can be automated reliably.

Yrzo AI runs 44 automated security checks against your website — the same techniques used in manual engagements — and delivers a full report in under 20 minutes. The findings are validated before they reach you, which means no false positives and no list of informational headers dressed up as vulnerabilities.

The cost starts at £399 per scan.

What £399 gets you versus what £8,000 gets you

At £399, a Yrzo AI scan covers SQL injection, XSS, IDOR, JWT attacks, SSRF, CORS misconfigurations, admin panel exposure, subdomain enumeration, SSL certificate issues, cookie security, email spoofing protection, and 33 more checks. The report is written in plain English with step-by-step remediation guidance your developer can act on the same day.

At £8,000, a traditional firm gives you all of that plus manual testing of complex business logic, a longer engagement window, and a CREST-accredited report suitable for regulatory or procurement requirements.

The question is which one your situation actually calls for. If you need CREST accreditation for a government contract, you need the traditional route. If you want to know whether your website is secure and what needs fixing, £399 delivers everything you need.

The cost of not doing it

The ICO fined companies £7.5 million in 2024 alone for data breaches that were traced back to preventable security vulnerabilities. Under UK GDPR, the maximum fine is £17.5 million or 4% of global annual turnover. Both figures dwarf the cost of any penetration test.

Beyond fines, a breach costs businesses an average of £3.4 million when you factor in incident response, customer notification, reputational damage, and lost contracts. The Ponemon Institute found that companies that test regularly have breach costs 30% lower than those that do not.

The penetration test is not the expense. The breach is.

What drives the price of a traditional pentest

If you are getting quotes from firms, the factors that move the price are scope (how many pages, APIs, and user roles need testing), the type of engagement (black box, grey box, or white box), the accreditation of the firm (CREST costs more than unaccredited), and how complex your application is.

A simple marketing site with a contact form costs less to test than a multi-tenant SaaS product with complex permissions and a payment API. Make sure the firm you speak to scopes the engagement properly before quoting — a quote without a scoping call is usually a guess.

Which option is right for your business

For most UK small businesses — e-commerce, professional services, SaaS, healthcare, and legal — an automated scan from Yrzo AI is the right starting point. It costs a fraction of a traditional engagement, delivers actionable results the same day, and catches the vulnerabilities that cause most real-world breaches.

If your findings reveal issues that need deeper investigation, or if you need a CREST-accredited report for a contract, you can commission a traditional engagement with a clear picture of your existing security posture already in hand.

Start at £399. Know where you stand. Fix what needs fixing.