Penetration Testing Services for UK Businesses
Penetration testing services from EJN Labs cover web applications, APIs, mobile apps, networks and cloud environments, delivered by CREST-accredited UK testers at a published day rate.
- Unlimited retesting
- Unlimited pre-retesting
- No hidden fees
“I would highly recommend EJN Labs to any organisation seeking reliable, detailed, and well-managed penetration testing services, particularly for government or enterprise-level projects.”
Imran SaghirProject Lead, SquareOne“There wasn’t another company we could find that could deliver what we needed in the timeframe we needed. The client loved it, and we got instant ROI from the engagement.”
Dan WilcocksonCo-Founder, CelloriSIX SERVICES
Choose the right penetration test
CREST-Certified Web Application Penetration Testing for UK Businesses
SaaS platforms, customer portals and e-commerce applications.
CREST-Certified API Penetration Testing for UK Businesses
REST, GraphQL and partner-facing APIs, tested for authorisation flaws.
Mobile App Penetration Testing for iOS and Android
iOS and Android apps and the APIs behind them.
CREST-Certified Internal Network Penetration Testing for UK Organisations
Active Directory, segmentation and lateral movement inside your network.
CREST-Certified External Penetration Testing for UK Businesses
Your internet-facing perimeter, tested the way attackers start.
CREST-Certified Cloud Penetration Testing for AWS, Azure and GCP
Configuration review and exploitation across AWS, Azure and GCP.
FIVE-STEP PROCESS
What every engagement includes
Scoping call
that fixes days, price and dates.
Manual testing
by UK-based testers, not scanner output.
Report
with steps to reproduce every finding.
Remediation guidance
your engineers can action directly.
Retest
to confirm your fixes closed the findings.
See a sample penetration test report before you book.
CREDENTIALS
Verified Accreditations Auditors Accept
Every credential below is independently verifiable. UK procurement teams, FCA supervisors, ISO 27001 / SOC 2 auditors, and cyber insurance underwriters all recognise these standards.
GET YOUR QUOTE
Get a CREST pen test quote in 24 hours
A fixed-price quote back in one business day, from a named CREST assessor. No sales pipeline, no chasing.
- CREST and IASME accredited. Testing your auditors and clients already recognise.
- Fast-track testing within 24 hours where required. Free retest of every fix included.
- Live findings via your client portal, not a four-week PDF.
- Fixed price from £3,500 for a single-role, single-app scope, agreed up front. Most engagements run £5,000 and up. No day-rate surprises.
Dan WilcocksonCo-Founder, CelloriUnder NDA Further named references available on a scoping call.
- We reply within one business day with a fixed-price quote from a named CREST assessor.
- You approve the scope and we book a start date, usually within 24 hours.
- Live findings land in your client portal as we test, with a free retest of every fix.
Get your fixed pen test quote in 24 hours
Quote request received
We will reply within one business day with your fixed-price quote from a named CREST assessor.
Your data stays with us. No newsletter signup.
or book a 20-min scoping call first
We reply within one business day. Your data stays with us. No newsletter signup.
PRICING
How our testing is priced
Testing is priced at a day rate of £1,100 to £1,400, scaled by the rarity of the engagement. Your price is that rate multiplied by the days your scope needs, fixed for a defined scope, not a flat fee. See the penetration testing cost guide and pricing page.
| Service | Typical price | Typical days |
|---|---|---|
| Web application | £8,000 to £18,000 | 6 to 12 |
| Mobile application | £7,500 to £14,000 | 5 to 10 |
| API | £7,000 to £12,000 | 4 to 9 |
| AWS cloud | £8,000 to £14,000 | 4 to 5 |
| External infrastructure | £6,500 to £12,000 | 3 to 5 |
Internal network testing follows the published infrastructure ranges: £1,200 to £3,600 up to around 150 hosts, typically 1 to 3 days.
BY SECTOR
Sectors we test
Law firms
Client files and case systems.
Law firms sector pageHealthcare
Patient data and clinical systems.
Healthcare sector pageFintech
Payment flows and FCA-regulated estates.
Fintech sector pageSaaS
Multi-tenant platforms and customer APIs.
SaaS sector pagePublic sector
Testing evidence procurement teams accept.
Public sector pageInsurance
Policyholder data and underwriting platforms.
Insurance sector pageWe deliver on-site or remotely UK-wide; for the capital, see penetration testing London, or browse all sectors.
FAQ
Frequently asked questions
How long does a penetration test take?
Most tests take 3 to 12 days: external infrastructure typically 3 to 5, web applications 6 to 12 and mobile apps 5 to 10. Scoping fixes your exact day count before work starts.
Are your testers UK-based?
Yes. Every tester is UK-based and works under our CREST-accredited processes; we never offshore testing. Remote is standard, on-site available UK-wide.
20+ CREST-certified testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Get a pen test quote in 24 hours
Tell us what needs testing and a CREST-accredited UK team replies within one business day with a fixed price.
