What Does Penetration Testing Actually Cost in the UK?
If you've started researching penetration testing for your business, you've probably noticed that pricing is rarely straightforward. Quotes vary wildly, scope definitions differ between providers, and it can be difficult to know whether you're being quoted a fair price or oversold a service you don't need.
This guide is designed to cut through that confusion. Whether you're an MD reviewing your cyber security budget for 2026, an office manager tasked with finding a provider, or a finance director trying to make sense of IT security audit costs, here's what you actually need to know.
Why UK SMEs Can No Longer Treat Pen Testing as Optional
Cyber attacks against small and medium-sized businesses in the UK have increased significantly over the past three years. The 2024 Cyber Security Breaches Survey found that 50% of UK businesses experienced some form of cyber attack or breach. SMEs are increasingly targeted precisely because attackers assume — often correctly — that defences are weaker than those of larger enterprises.
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Beyond the risk itself, there are growing compliance and contractual pressures. If your business handles personal data under UK GDPR, works with the public sector, or operates within a supply chain that requires Cyber Essentials Plus or ISO 27001 certification, penetration testing is likely either expected or explicitly required.
The question, then, isn't really whether to invest in pen testing — it's how to budget for it sensibly.
Penetration Testing Pricing UK: What to Expect in 2026
Penetration testing cost in the UK varies depending on scope, methodology, and the accreditation of the provider. Here are realistic price ranges for the most common types of test:
External Network Penetration Test
- Typical cost: £1,500 – £4,000
- Tests publicly facing infrastructure (websites, VPNs, mail servers)
- Suitable for most SMEs as a starting point
Internal Network Penetration Test
- Typical cost: £2,500 – £6,000
- Simulates an attacker already inside your network (e.g. via phishing or a rogue device)
- Particularly valuable if you have on-premises servers or sensitive internal systems
Web Application Penetration Test
- Typical cost: £2,000 – £8,000+
- Assesses vulnerabilities in a specific web application or customer-facing portal
- Price increases significantly with the complexity of the application
Social Engineering / Phishing Simulation
- Typical cost: £1,000 – £3,500
- Tests staff awareness and susceptibility to phishing attacks
- Often bundled with security awareness training
Full Infrastructure Test (Combined Scope)
- Typical cost: £5,000 – £15,000+
- Comprehensive assessment combining internal, external, and application testing
- Appropriate for businesses with more complex environments or higher compliance requirements
These figures reflect current penetration testing pricing in the UK for reputable providers. Be cautious of quotes significantly below these ranges — they often indicate automated scanning dressed up as manual testing, which provides far less actionable intelligence.
CREST Accredited Penetration Testing: Why Accreditation Matters
Not all pen testing is equal. When evaluating providers, look specifically for CREST accredited penetration testing. CREST (the Council of Registered Ethical Security Testers) is the UK's leading accreditation body for cyber security testing services. A CREST-accredited firm has demonstrated that its testers meet rigorous professional and ethical standards.
This matters for two reasons. First, it gives you confidence that the testing is genuinely manual, rigorous, and conducted by qualified professionals rather than relying solely on automated tools. Second, many insurers, public sector clients, and enterprise supply chains specifically require CREST accreditation — so a report from a non-accredited provider may not satisfy your compliance obligations.
Always ask prospective providers whether they hold CREST accreditation and request the credentials of the individual testers who will conduct your assessment.
What Affects the Final Price?
Several factors will influence your specific quote:
- Scope and size of the environment — Number of IP addresses, applications, and user accounts being tested
- Number of test days — Most assessments are priced on a day-rate basis, typically £800–£1,500 per day for qualified testers
- Retest inclusion — Some providers include a retest after remediation; others charge separately
- Report quality — A thorough, board-ready report requires more analyst time and will cost more
- Urgency and scheduling — Rush assessments often carry a premium
At Coreitech, we recommend that SMEs start by clearly defining what they want to protect before approaching any provider. A focused test on your most critical systems will almost always deliver more value than a broad, shallow assessment across everything.
Building Pen Testing Into Your 2026 IT Budget
For most UK SMEs, an annual or biannual penetration test is a reasonable and proportionate approach. Here's how to frame it in your budgeting process:
Treat It as Insurance, Not a One-Off
A single test tells you your security posture at a point in time. Your environment changes — new software, new staff, new infrastructure — so testing should be recurring. Build a line item into your annual IT budget rather than treating it as a reactive expense.
Combine With Cyber Essentials
If your business hasn't yet achieved Cyber Essentials certification, doing so before commissioning a pen test makes financial sense. Cyber Essentials (and Cyber Essentials Plus) addresses foundational controls and can cost between £300 and £1,500 depending on your organisation size. Tackling basic hygiene first means your pen test budget goes further.
Factor In Remediation Costs
The test itself is only part of the investment. Budget for the remediation work that follows — patching systems, reconfiguring firewalls, updating access controls. If your IT support provider is separate from your pen testing provider, ensure there's a clear handoff process so findings are acted upon promptly.
Use the Report Strategically
A quality pen test report is a business document, not just a technical one. Use it to inform board-level conversations about risk, to satisfy client due diligence requests, and to prioritise your IT roadmap for the year ahead.
A Practical Checklist Before You Commission a Test
- [ ] Define the scope clearly — what systems, applications, and locations are in scope
- [ ] Confirm the provider holds CREST accreditation
- [ ] Ask whether testing is primarily manual or automated
- [ ] Clarify whether a retest after remediation is included
- [ ] Ensure you'll receive both an executive summary and a technical report
- [ ] Check that rules of engagement and liability are covered in the contract
- [ ] Notify relevant internal stakeholders (IT team, legal, compliance) before testing begins
Get Expert Guidance Before You Commit
Navigating cyber security for UK businesses doesn't have to be complicated, but it does require working with people who understand your environment and your risk profile. The right pen testing provider won't just hand you a report — they'll help you understand what it means and what to do next.
If you'd like an honest conversation about what penetration testing your business actually needs — and what it should cost — the team at Coreitech is happy to help. We work with SMEs across London and the UK to build practical, proportionate cyber security strategies.
Call us on 0203 834 9728 or email sales@coreitech.co.uk to speak with one of our specialists. No obligation, no jargon — just straightforward advice.