Which language must work instructions be in? Belgian regions

The operating site decides

Belgium has four language areas, and every municipality belongs to exactly one of them. The Constitution gives the communities the power to regulate language use in labour relations in the Dutch- and French-language areas by decree, and leaves Brussels-Capital, the German-language area and the municipalities with language facilities to federal law.

Which rule applies to you depends on the location of the operating site (exploitatiezetel, siège d'exploitation): a place of business with some permanence to which the worker is attached, usually where instructions are given. The address of the head office does not matter. A retailer based in Brussels with stores in Ghent, Namur and Eupen runs three language regimes, one per store.

This guide covers the language rules only. What the instruction itself must contain, and when it is due, is covered in what Belgian and Dutch law require for workplace instruction. The rules below are as of September 2026.

Region by region

The request for a mandatory translation in the Dutch-language area follows a fixed order: a unanimous request from the employee members of the works council; without a works council, a unanimous request from the union delegation; without either, a request from a delegate of a representative union. Whatever the translation, the Dutch version prevails.

What the rule covers

In the Dutch- and French-language areas the decrees cover "social relations": individual and collective contacts between employer and workers that relate directly or indirectly to the employment, spoken as well as written. Treat written work instructions, safety rules, induction material and training modules handed to staff as documents intended for staff. They fall inside the rule.

The sanction is nullity. In the Dutch- and French-language areas a document that breaks the rule is void, and the Flemish decree states that the nullity may not harm the worker. That makes the practical risk one-sided: a safety rule you cannot rely on against the worker, in the very situation where you need to show it was given. Since 2014 the Flemish decree allows a legally binding version of an individual employment contract in another EU language for cross-border cases; that exception is about contracts, not about instructions on the floor.

Where well-being law pulls the other way

The language laws say which version must exist. Well-being law asks whether the instruction reached the person. The Codex over het welzijn op het werk requires training that is sufficient and appropriate for each worker's workstation or function, and only workers who received appropriate instructions may enter zones with serious and specific hazards. A Dutch instruction handed to an operator who reads Romanian meets the first law and is hard to defend under the second.

For a site in Flanders with a mixed crew, the complete answer is therefore two layers: the Dutch version that the decree requires, and a translation in the language each worker reads. The Netherlands has no equivalent language law for labour relations; there the only test is the one in Arbowet art. 8 and Arbobesluit art. 7.11a, that instruction reaches the worker in comprehensible form.

What automatic translation may replace

Automatic translation is a legitimate way to produce the added translation. It does not change which version the law requires.

The broader case for delivering training in every worker's language, and where a machine is not enough, is covered in training in every worker's language.

How Aristotl handles it

In Aristotl you write or import each course once, in the language your site's area requires, and that master is the version you maintain. Each worker then reads a translation of the current master in their own language on their phone, so the Dutch or French version and the Polish or Romanian one never drift apart. You see which languages are ready before anyone is instructed, and completion is viewable per site and version in the platform.

List your operating sites by language area. For each one, check that every instruction handed to staff exists in the required language, and that the translations your crews actually read show the same version.