The verdict in three sentences
No enterprise buyer will sign your SaaS business web app without a solid DPA (Data Processing Agreement) and demonstrable GDPR compliance. In 2026, technical compliance costs GBP 9,000 to 26,000, plus GBP 2,500 to 7,000 for the DPA and records of processing. Plan a 6-to-12-week timeline and a recurring DPO plus compliance-maintenance budget.
GDPR checklist line by line: what to build
GDPR compliance is not a document, it is a set of features and processes verifiable in the app.
| Technical line | 2026 range (GBP) | Timeline |
|---|---|---|
| Consent management + traceability | 1,800–4,500 | 1–2 wk |
| Purge / retention periods | 1,300–3,500 | 1 wk |
| Data export (portability) | 1,300–3,500 | 1 wk |
| Access logging (audit) | 1,800–5,300 | 1–2 wk |
| Encryption at rest | +5 % of build | 1 wk |
| Anonymisation / pseudonymisation | 1,300–4,500 | 1–2 wk |
| DPA + records of processing | 2,500–7,000 | 1–2 wk |
Together this runs GBP 9,000 to 26,000 depending on existing technical debt. Encryption at rest adds roughly 5 % to infrastructure cost, marginal against the contractual requirement.
Cost of compliance vs penalty risk
The question is not what compliance costs but what non-compliance costs. GDPR provides for fines up to GBP 17.5m or 4 % of global turnover.
| Scenario | Cost / impact |
|---|---|
| Full compliance (build) | GBP 9,000–26,000 (one-off) |
| Outsourced DPO | GBP 350–1,050 /month |
| Compliance maintenance | GBP 300–800 /month |
| Breach notification handling | GBP 4,500–22,000 /incident |
| ICO penalty (typical SME) | GBP 18,000–260,000 |
| Loss of an enterprise contract | GBP 45,000–450,000 /year |
The math is decisive: the cost of compliance (one-off plus modest recurring) is an order of magnitude below the combined risk of penalty and lost business.
Mini case study
Sophie runs an HR SaaS vendor in London (18 staff) and targets a contract with a FTSE 100 group that requires a DPA and a GDPR audit. Technical compliance: GBP 16,500 (consent, purge, export, logging). DPA + records: GBP 4,800. Outsourced DPO: GBP 600/month. Over 12 months the total investment reaches ~GBP 28,500. The enterprise contract is worth GBP 190,000/year: GDPR compliance paid for itself in under 2 months of billing and unlocked an entire segment of demanding clients.
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FAQ
Is a DPA really mandatory?
Yes, whenever you process personal data on behalf of a client (GDPR Article 28). Without a signed DPA, no enterprise buyer will take the legal risk of entrusting you with their data.
Do we need a DPO even as a small company?
Not always mandatory, but strongly recommended and often required by buyers. A shared, outsourced DPO (GBP 350–1,050/month) is enough for an SME SaaS.
How long to become compliant?
Expect 6 to 12 weeks depending on technical debt. Consent, purge and export features are usually the slowest to build properly.
What if there is a data breach?
Notify the ICO within 72 hours and, depending on severity, the affected individuals. Handling an incident costs GBP 4,500–22,000, which is why logging matters: it lets you scope the breach fast.
Is encryption at rest mandatory?
Not strictly, but it is an "appropriate measure" almost always expected for personal data, and its overhead (~5 %) is negligible.
Let's scope your project. Describe your SaaS, the data types processed and your enterprise buyer's requirements: we price technical compliance, the DPA and ongoing maintenance. 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.
