The verdict in three sentences
Hosting a SaaS in the EU in 2026 costs 20 to 40 % more than a US hyperscaler at equal specs, but unlocks markets where data localisation is an eliminatory clause. For a vendor targeting public sector, healthcare or banking, sovereignty is not a cost, it is a market-access criterion. The real trade-off isn't technical but commercial: how many contracts do you lose because your data transits through the United States?
US cloud vs sovereign: what you actually pay
A typical B2B SaaS in 2026 (a few hundred accounts, transactional database, daily backups, CDN) runs on a managed stack. Here are the monthly orders of magnitude observed on French sovereign providers versus US equivalents.
| Item | OVHcloud / Scaleway | AWS / GCP (eu-west) | Gap |
|---|---|---|---|
| Managed instance (4 vCPU / 16 GB) | 150-320 EUR | 130-260 EUR | +15 to 25 % |
| Managed database (PostgreSQL HA) | 80-300 EUR | 90-320 EUR | comparable |
| Object storage + backups (500 GB) | 20-60 EUR | 15-55 EUR | +10 % |
| CDN + egress (1 TB/month) | 30-140 EUR | 60-200 EUR | -30 to -50 % |
| Estimated monthly total | 280-820 EUR | 295-835 EUR | near neutral |
| SecNumCloud certification | available (dedicated offer) | not applicable | public sector access |
The real gap is far smaller than the reputation suggests, notably because egress (outbound traffic) is markedly cheaper on European providers. The premium concentrates on raw compute, not the overall bill.
Data localisation: the guarantees that matter
Saying "hosted in the EU" isn't enough in a tender. Here are the guarantees to demand and document.
| Guarantee | What the buyer checks | 2026 benchmarks |
|---|---|---|
| Physical region | Datacenters located in the EU | Roubaix, Gravelines, Paris |
| Extraterritorial immunity | Ownership outside US Cloud Act | French / EU providers |
| SecNumCloud (ANSSI) | Required for sensitive public sector | active qualification |
| Encryption at rest | AES-256, EU-managed keys | standard |
| DPA + sub-processors | Register of localised sub-processors | contractual annex |
| Reversibility | Data export without lock-in | exit clause |
For a client bound by the French state's "cloud at the centre" doctrine, only a SecNumCloud-qualified offer clears the filter. For a private European client, no transfer outside the EU plus a solid DPA generally suffices.
Mini case study
Thomas runs a 14-person HR SaaS vendor in Nantes. Two tenders (a local authority and a mutual insurer) require sovereign hosting, representing 180,000 EUR in annual contracts. His cloud bill rises from 620 EUR/month (US) to 780 EUR/month migrating to Scaleway, i.e. +1,920 EUR/year. The premium equals 1 % of the unlocked contracts. The migration (audit, redeployment, testing) costs him 12,000 EUR once. ROI is reached on the first signed contract, with a differentiating argument reusable across all future public tenders.
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FAQ
OVHcloud or Scaleway: which to pick?
Both offer EU datacenters and comparable managed services. Scaleway stands out on GPU instances and a polished developer console; OVHcloud on breadth of range and a mature SecNumCloud offer. For a standard SaaS, the price gap stays under 10 %.
Does sovereignty slow performance?
No. Latency and availability match a hyperscaler for European users, often better since datacenters are closer. A European CDN covers the rest.
Is SecNumCloud mandatory?
Only if you target sensitive public sector or critical operators. For a private client, EU hosting + DPA + encryption suffices in 90 % of cases. SecNumCloud qualification adds non-trivial cost and delay.
Is migrating from AWS risky?
The main risk is dependence on proprietary services (Lambda, DynamoDB). A stack based on PostgreSQL, S3-compatible object storage and containers migrates in 2-4 weeks with a controlled cutover window.
How long for a full migration?
For a mid-sized SaaS: audit 3-5 days, redeployment and testing 2-3 weeks, production cutover 1 day. Budget an order of magnitude of 8,000 to 20,000 EUR of support depending on complexity.
Let's scope your project. Describe your current stack, localisation requirements and account count, and we'll price the sovereign migration and target monthly cost. 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.
