The verdict in three sentences
Securing a custom web app before a client audit costs between 7,000 and 21,000 EUR in 2026 in Dublin, combining a pentest and GDPR compliance work. The most underestimated line item is not the code but hosting (EU/HDS), logging and access governance, which decide whether you pass the audit. Budget 4 to 8 weeks to turn a working app into one you can defend before a DPO or an enterprise buyer.
Security budget line items in 2026
Hardening is not just a penetration test. A CIO preparing for a client audit must budget several parallel workstreams. Here are the ranges observed in Dublin, as a 2026 order of magnitude.
| Line item | 2026 range (EUR) | Timeline |
|---|---|---|
| Application pentest (grey box) | 4,000 - 12,000 | 1-2 weeks |
| GDPR compliance work | 3,000 - 9,000 | 2-4 weeks |
| Encryption at rest + in transit | 1,500 - 4,000 | 1 week |
| MFA + role management (RBAC) | 2,000 - 5,000 | 1-2 weeks |
| Logging / audit trail | 1,500 - 4,500 | 1 week |
| Migration to EU/HDS hosting | 2,000 - 8,000 | 1-3 weeks |
A full project rarely stacks every maximum: a realistic SME scope lands between 10,000 and 18,000 EUR for a serious first upgrade.
Pentest vs GDPR compliance: two logics
A pentest hunts for exploitable technical flaws; GDPR compliance checks that data processing is lawful, documented and controlled. The two are complementary but not interchangeable.
| Criterion | Pentest | GDPR compliance |
|---|---|---|
| Goal | Find exploitable flaws | Govern data processing |
| Deliverable | Vulnerability report + severity | Register, DPA, notices, procedures |
| Reference | OWASP Top 10, ASVS | GDPR + regulator guidance |
| Frequency | Yearly or before go-live | Continuous + yearly review |
| 2026 cost | 4,000 - 12,000 EUR | 3,000 - 9,000 EUR |
| Risk avoided | Compromise, ransom | Fine up to 4% of turnover |
The minimal OWASP checklist for 2026: broken access control (the number-one risk), injection, misconfiguration, exposed secrets, missing logging, vulnerable dependencies. The average cost of a data breach for a European SME is estimated at around 150,000 to 300,000 EUR (remediation, notification, churn): prevention stays ten times cheaper.
Mini case study
Aoife, CIO of a healthtech SME in Dublin (58 staff), must pass a hospital client's security audit before signing a contract worth 240,000 EUR/year. Her patient-tracking app runs without MFA, without logging and on non-HDS hosting. She budgets: pentest 8,000 EUR, GDPR 6,000 EUR, MFA + RBAC 4,000 EUR, HDS migration 5,000 EUR, i.e. 23,000 EUR over 7 weeks. With the contract worth 240,000 EUR/year, the security spend equals less than 10% of a single year of signed revenue: audit passed, contract won.
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FAQ
How much does a pentest cost in 2026 in Dublin?
Between 4,000 and 12,000 EUR depending on attack surface and test type (black, grey or white box). A mid-size custom app typically lands around 7,000 EUR for a grey-box test.
Is HDS/EU hosting mandatory?
It becomes mandatory as soon as you host personal health data on behalf of a third party. Migrating to a certified provider costs 2,000 to 8,000 EUR upfront, plus a 20-40% monthly premium on hosting.
How long does it take to secure an app before an audit?
Budget 4 to 8 weeks for an SME scope. The pentest takes 1 to 2 weeks, but remediating critical flaws and completing GDPR work extend the timeline.
What is the financial risk of GDPR non-compliance?
A fine can reach 4% of worldwide annual turnover. Beyond the fine, the average breach cost for an SME is estimated at 150,000 to 300,000 EUR all-in.
Should the pentest be repeated every year?
Yes, at least once a year and after every major release. Many enterprise buyers require a pentest report less than 12 months old in their RFPs.
Let's scope your project. Tell us about your application, the data it handles and your audit deadline, and we will price the pentest, GDPR work and hosting. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
