B2B Prospecting in Belgium: French, Dutch or English?

To prospect B2B buyers in Belgium, run one campaign per language. Dutch for Flanders. French for Wallonia. In Brussels, the contact's own language, and often English for international head offices. Decide the language person by person, not company by company. Write each version in its own language instead of translating the first one. And keep the lists apart, so nobody receives the same email twice in two languages.

Where the contact sits, the language to write in, and the mistake to avoid.

 

Write in

Watch out

Company in Flanders

Dutch, with Flemish wording.

Dutch from the Netherlands, or English "to be safe".

Company in Wallonia

French, with Belgian wording.

French from France: "portable", "soixante-dix".

SME in Brussels

The contact's own language, read from their LinkedIn profile.

Guessing from the address. Brussels is bilingual.

International head office in Brussels

English, unless the profile says otherwise.

Forcing French or Dutch on an international team.

Company just outside Brussels, in Flemish Brabant

Dutch by default. French if the profile is in French.

Treating it as Brussels. It sits in Flanders.

East Belgium (German-speaking)

German, if you can write it well.

German run through a translation tool.

The address gives you the default language. The person decides.

Belgium is three markets in one country

The Belgian Constitution splits the country into four language areas (article 4). The province of the registered office tells you which one a company sits in:

• Dutch: Antwerp, Limburg, East Flanders, West Flanders, Flemish Brabant;
• French: Hainaut, Liège, Luxembourg, Namur, Walloon Brabant;
• bilingual: the 19 municipalities of Brussels-Capital;
• German: 9 municipalities in the east of the province of Liège.

For a B2B SME, that makes three markets you can realistically write to, plus a small German-speaking one.

Belgium is also small. In one sector, the buyers in a province often know each other. A clumsy email gets forwarded, or mentioned at the next event. A small list burns fast.

One campaign or three?

Three. Or two, if you only sell in one part of the country plus Brussels.

One campaign that covers all of Belgium sounds simpler. In practice, it mixes things you need to keep apart:

1. The language. A Dutch email and a French email are two texts. They don't share a subject line, a first sentence or a follow-up.
2. The results. If French gets replies and Dutch gets none, a pooled reply rate hides it. You end up rewriting the message that worked.
3. The examples. A buyer in Ghent relates to an example from Flanders. A buyer in Namur relates to one from Wallonia. The proof you put forward changes too.

The split that works for most B2B SMEs:

• one campaign in Dutch for Flanders and Dutch-speaking contacts in Brussels;
• one campaign in French for Wallonia and French-speaking contacts in Brussels;
• one campaign in English for international head offices, if they are in your target at all.

Inside each language, you can still split by segment, such as role or sector. The language comes first because it changes every word. The segment comes second because it changes the angle. How to choose the segments themselves is covered in how to define your ideal customer profile.

When is one campaign enough? When your market really sits in one region. A company that only serves Wallonia doesn't need a Dutch campaign. It needs a very good French one.

Which language for whom

Most guides decide the language from the address: Flanders gets Dutch, Wallonia gets French, done. That works for most of the country. It fails exactly where Belgium gets interesting: Brussels, the border areas, and international teams.

The rule that holds: the address gives you the default language, the person decides. Here's the order to check ↓

1. The contact's LinkedIn profile. The language of the headline, the job title and their own posts. A sales director who writes their posts in Dutch reads Dutch, even at a company based in Brussels. At scale, LinkedIn Sales Navigator has a Profile language filter on leads, so you can split a search by language without opening every profile.
2. The company website. Which language opens by default? Is there a Dutch version at all? A site in French only, based in Flanders, tells you something.
3. The registered office. Its language area gives you the default when the first two say nothing.

Three cases need extra care.

Brussels. Officially bilingual. French-speaking and Dutch-speaking decision-makers work side by side, sometimes in the same company. Never guess from a Brussels postcode. Read the profile.

The ring around Brussels. Every municipality bordering Brussels is in Flemish Brabant, so in the Dutch language area. Six of them offer language facilities to French speakers, and many contacts there work in French. Dutch is the default. The profile can overrule it.

International head offices. A regional head office in Brussels often runs in English, with a team from several countries. Writing to them in French or Dutch can read as a local supplier who didn't look. English is usually the right call there.

One firm rule: no bilingual email. Some companies send cold emails with French on top and Dutch underneath, to cover both. It reads like an administrative letter. Worse, it tells the reader you didn't know which language they speak. Pick one.

Write it, don't translate it

A cold email is short. Four to six sentences. Every word carries weight, and a reader notices within one line that the text was written in another language first. The structure of a message that gets replies is covered in how to structure a cold email. Here, the point is narrower: each version is written from scratch, in its language, from the same angle.

Same promise. Same small next step. Different words, different length, different examples.

The same small next step, written in each language first. None of them is a translation of the others.

🐓Wallonia · French

"Auriez-vous un quart d'heure la semaine prochaine pour en parler ?"

🦁Flanders · Dutch

"Hebt u volgende week een kwartiertje voor een kort gesprek?"

⚜️Brussels head offices · English

"Worth 15 minutes next week?"

Three lengths, three registers. The English is five words. The French keeps "vous". The Dutch uses "u", the safe choice for a first contact in Flanders.

Flemish is not the Dutch of the Netherlands

A Flemish buyer notices Dutch from the Netherlands straight away. The grammar is the same. The everyday words are not. A few examples that show up in B2B emails:

• a mobile phone is a gsm in Flanders, a "mobiel" in the Netherlands;
• the manager of a small company is the zaakvoerder, a word Dutch readers from the Netherlands rarely use;
• for a first contact, "u" is the safe choice in Flanders. "Je" can come later, once they have replied.

Some messages are written by a writer from the Netherlands, or by a translation tool trained mostly on that Dutch. They read like a supplier from abroad. For some offers, that's fine. For a Belgian SME selling to Belgian SMEs, it costs you the one thing a cold email needs: the feeling that the sender is close.

Belgian French is not the French of Paris

The same goes the other way. Belgian French has its own words, and a Walloon reader spots French from France just as fast:

• septante and nonante, not "soixante-dix" and "quatre-vingt-dix";
• a GSM, not a "portable";
• the "administrateur délégué", where France has a "PDG".

"Vous" is the rule in a first B2B email in French, and stays the rule. A template written for the French market, with Paris examples and Paris references, gets the same reaction in Liège as a Netherlands-Dutch email gets in Antwerp.

What changes between a Flemish and a Walloon buyer

Less than the clichés say. Both buy the same way:

• a clear problem they recognise;
• a sender who looks credible;
• a small next step.

What changes sits around the decision, beyond the language covered above.

The references. A buyer trusts an example from their own region and sector more than a generic one. A case from a Flemish company speaks to Flanders. A case from a Walloon company speaks to Wallonia. If your proof comes from one side only, say so honestly rather than dressing it up.

The networks. Each region has its own business networks, federations and events. A buyer in Liège and a buyer in Leuven don't meet at the same dinners. When you mention a shared context, it has to be theirs.

What doesn't change:

• the quality of the list;
• the relevance of the angle;
• a follow-up that adds something instead of repeating the first email.

How to build the list by language

The list decides the language. So you build it with the language in mind from the first step.

The Crossroads Bank for Enterprises (KBO / BCE), run by FPS Economy, lists every Belgian company with the same fields, which makes it the cleanest starting point.

Then, in order:

1. Filter companies on your ideal profile. Activity code, size, region. Start from the deals you already won.
2. Tag each company with its default language from the address of its registered office.
3. Find the decision-makers and tag each person with their own language, using the order above: profile, website, address.
4. Split into campaigns by the person's language.
5. Deduplicate across campaigns. One person sits in one campaign only. Check subsidiaries and holdings too, where the same director can appear under two companies.
6. Remove anyone you already talk to. Current clients, open deals, recent conversations.

Step 5 is the one people skip. In a small country, it's the one that hurts most. A CFO who receives your email in French on Monday and in Dutch on Wednesday won't reply to either.

One practical note: the rules on prospecting differ by channel and by country. Check them before you send.

Before you launch: who takes the call in Dutch?

Positive replies go to you. You take the calls. They are your future clients. That means the language of the campaign is also the language of the call. A Flemish buyer who replies in Dutch and gets called back in French, or in hesitant Dutch, may not take the second call.

Before you launch a campaign in a language, answer three questions:

• Who on your team answers a positive reply in that language, and how fast?
• Who takes the first call in that language?
• If nobody can, what does the email offer instead? A call in English, said openly, beats a surprise on the phone.

If nobody on your side speaks Dutch, a Dutch campaign isn't a lost cause. But say it honestly. "The call can be in English or French" in the follow-up is better than pretending.

The wider method, from list to meeting, is in the B2B outbound sales strategy.

How we run it at Kaizen

We run personalised, automated prospecting by email and LinkedIn for B2B SMEs, in French, Dutch and English. Every message is written per language for Flanders, Wallonia and Brussels, and in English for international head offices. Never translated from one template.

Interested prospects reply to you directly. You take the calls. If replies don't turn into calls, we take them over, depending on the plan. And you own the system at the end:

• the target list;
• the messages that got replies;
• the sending domains;
• the CRM.

The first campaigns go live within 30 days, or your first month is free. If you are comparing agencies for Belgium, our list of B2B lead generation agencies in Belgium shows which ones write in which languages.

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