The verdict in three sentences
A multilingual institutional website costs between 50,000 and 150,000 EUR (net), most of the premium coming from the number of languages and editorial governance. The technical foundation relies on a headless CMS (Sanity or Strapi) with a multi-level validation workflow and WCAG 2.1 AA compliance. A realistic timeline is 4 to 6 months, with maintenance of 1,200 to 3,000 EUR/month.
The real cost of multilingual
The classic trap is underestimating the per-language cost and the governance load. Each added language is not just a translation: it is a validation flow, a reviewer and perennial maintenance.
| Line item | 2026 range (EUR net) | Note |
|---|---|---|
| Foundation + headless CMS | 22,000 - 55,000 | Editorial workflow included |
| Accessible design system | 10,000 - 28,000 | WCAG 2.1 AA native |
| Per-language cost | 3,000 - 6,000 | Translation + integration + QA |
| Governance and roles | 5,000 - 15,000 | Validation flows |
| Accessibility (audit) | 6,000 - 14,000 | Report + fixes |
| Total (5 languages) | 50,000 - 150,000 | Excluding maintenance |
For five languages, the translation/integration line alone represents 15,000 to 30,000 EUR: it is the main budget lever.
The content governance architecture
An institution cannot publish without control. The CMS must model roles and a validation flow before going live, with traceability.
| Role | Responsibility | CMS right |
|---|---|---|
| Contributor | Writes content | Create, draft |
| Language reviewer | Checks translation | Comment, feedback |
| Business validator | Approves substance | Level 1 validation |
| Editorial lead | Approves publication | Level 2 validation |
| Administrator | Manages roles and models | Configuration |
A two-level validation workflow sharply reduces the risk of public error; budget 5,000 to 15,000 EUR to configure it finely across your departments.
Mini case study
Martin, secretary general of an institution in London, runs a site in six languages. Approved budget: 118,000 EUR (net), 5-month timeline. The multilingual line represents 6 languages x 4,500 EUR, i.e. 27,000 EUR. By centralizing governance in a workflow-driven CMS, his communications team cuts the time to publish a statement from 3 days to half a day, an estimated saving of dozens of hours per quarter on a sustained editorial flow.
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FAQ
How much does a multilingual institutional website cost in 2026?
Between 50,000 and 150,000 EUR (net) depending on the number of languages and governance. A trilingual site starts around 50,000 EUR; beyond five languages with workflow, budget 100,000 to 150,000 EUR.
What is the cost per additional language?
Between 3,000 and 6,000 EUR per language in 2026: translation, integration and quality control. This cost partly recurs each year in maintenance.
Why a headless CMS rather than a classic CMS?
Because it separates content from presentation, eases multilingual work and enables a robust validation workflow. It is the standard for institutional governance.
Is WCAG 2.1 AA compliance mandatory?
Yes for public bodies and institutions. Budget 6,000 to 14,000 EUR for the audit and fixes, with a published accessibility statement.
How long does the project take?
Budget 4 to 6 months. The critical path is often translation and internal validation flows, not the technology.
Let's scope your project. Tell us the number of languages and your validation flows, and we will frame scope, indicative budget and timeline. 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.
