The verdict in three sentences
Making a web app GDPR compliant in Montreal costs 5,000 to 18,000 EUR in 2026, depending on the volume of personal data and processing activities. It is not just a legal exercise: GDPR affects the technical architecture (encryption, EU hosting, minimization, logging). The stakes are real: fines can reach 4 % of global revenue, and a large client will refuse to sign without proof of compliance.
What a compliance project covers in 2026
Compliance combines documentation (records, DPA), features (consent, data subject rights) and technical work (encryption, hosting). Here are the 2026 orders of magnitude.
| Service | Contents | Timeline | Price (EUR) |
|---|---|---|---|
| GDPR assessment | audit + gaps | 1-2 wks | 2,000 - 4,000 |
| Standard compliance | records + consent + DPA | 4-6 wks | 5,000 - 10,000 |
| Full compliance | + encryption + automated rights | 6-8 wks | 12,000 - 18,000 |
| EU hosting migration | host change | +1-2 wks | +2,000 - 5,000 |
| DPO support | monthly follow-up | recurring | 500 - 1,500/mo |
Data subject rights features (access, erasure, portability) are often the bulk of development, because they touch the whole database.
CNIL checklist and architecture impact
Each CNIL requirement translates into a technical decision. Here is the mapping that structures the project.
| CNIL requirement | Technical translation | Effort |
|---|---|---|
| Records of processing | data mapping | Low |
| Consent | banner + timestamped proof | Medium |
| Access/erasure rights | endpoints + export/deletion | High |
| Minimization | review of collected fields | Medium |
| Security | encryption at rest + TLS | Medium |
| EU hosting | migration if outside EU | Variable |
| Processors | signed DPAs | Low |
Encryption at rest and the access log are often missing from existing apps and require database and infrastructure changes.
Mini case study
Thomas, head of a 30-person SaaS SME in Montreal, must sign a large account that demands GDPR compliance before contract. The deal is worth 80,000 EUR/year. He orders full compliance at 14,000 EUR plus 800 EUR/month of DPO support.
First-year total: 14,000 + (800 x 12) = 23,600 EUR. Against that, the signed contract brings 80,000 EUR/year, and compliance opens access to other large accounts with the same demands. Without compliance, not only is the deal lost, but the fine risk (up to 4 % of revenue) hangs over the existing business. ROI is immediate upon signing the first contract.
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FAQ
How much does GDPR compliance cost?
Between 5,000 and 18,000 EUR depending on data volume and processing. A simple assessment costs 2,000 to 4,000 EUR.
What is the risk of non-compliance?
A CNIL fine up to 4 % of global revenue or 20M EUR, plus the loss of clients demanding compliance. The commercial risk often precedes the legal one.
Do we need EU hosting?
Not always mandatory but strongly recommended. Migrating to an EU host costs 2,000 to 5,000 EUR and simplifies transfer compliance.
How long to become compliant?
4 to 8 weeks depending on scope. The initial assessment takes 1 to 2 weeks and frames the work.
Is consent enough?
No: you also need records, data subject rights, minimization, security and processor DPAs. Consent is just one building block.
Let's scope your project. Describe your app, your personal data and your client deadline: we'll price the assessment and full GDPR compliance. 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.
