Best B2B Lead Generation Agencies in Belgium (2026)

Here are the best B2B lead generation agencies in Belgium in 2026, grouped by what they actually do. For outbound and prospecting: Kaizen, Leadix, Frontal, Seventic, Skondras and WinPeo. For marketing, ads and inbound: Customer Impact, ClickForest, Connexion and Qonversio. We wrote this list. And we put ourselves first. So the scorecard below gives you the questions to check every agency on it, us included. The facts about the other agencies come from their own websites, checked in September 2026, and from what we know of them first-hand.

How to choose a B2B lead generation agency in Belgium

Most comparison pages list the agencies first and the criteria second. We start with the criteria. The same agency can be the right choice for one company and three wasted months for another. We built the list on six criteria. Use the same six to check it. Here's what to check ↓

1. Who owns the system at the end. While a lead generation agency works for you, it builds things:

• a list of target accounts;
• the contacts;
• sequences that got replies;
• sending domains;
• a CRM set up stage by stage.

Some agencies hand all of it over. Others work from their own database and keep it. Neither model is dishonest. But only one leaves you with an asset. Get the answer in writing, before you sign, as covered in when to hire an acquisition agency.

2. Languages. French, Dutch and English are three markets. Not one translation job. The section on languages below shows why.

3. Who answers the replies. This is where most campaigns quietly lose money. A positive reply that sits for three days is often a lost deal. Some agencies pass every interested reply to you straight away. Others qualify it by phone and book the meeting themselves. Both work. As long as the split is clear before launch.

4. What is measured. Emails sent and open rates tell you how busy the agency was. Not what you got. Judge the work on meetings that actually happened. And on qualified conversations with the people you want to sell to. For ads and inbound agencies, the equivalent is the enquiries that land in your CRM. Not clicks.

5. Direct access to the people doing the work. In a small agency, the person writing your sequences is often on the weekly call. In a large one, an account manager may sit between you and them. So ask:

• Who writes the messages?
• Who reads the replies?
• Will you speak to them?

6. A date for the first campaign. Setting up domains, lists and sequences takes a few weeks. An agency that knows its process gives you a date. How long the whole ramp takes is covered in how long outbound takes to work.

Why we put Kaizen first

We wrote this article. Kaizen is first on the list. Customer Impact does the same on its own ranking of agencies in Belgium, and says so openly. For us, it's the only honest way to publish a list like this:

• say it;
• show the criteria;
• let you check.

We rank ourselves first on these criteria because we built the agency around them. You own the system. All of it:

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

We write in French, Dutch and English. Interested prospects reply to you directly, because they are your future clients. If those replies don't turn into calls, we take them over. We report on meetings booked and pipeline created. You talk to the people doing the work. And the first sequences go live within 30 days, or your first month is free.

Kaizen isn't for everyone. We'd rather say it here than on a call:

• If nobody has bought your offer yet, sell it by hand first. A system scales something that already works. It doesn't replace that proof.
• If your deals are small, a full acquisition system doesn't pay for itself.
• If you need meetings next week, a system is the wrong answer. We build it over weeks. Then it holds.
• If you want someone to call your prospects, Seventic or Skondras are built for that.
• If you want someone to take the sales calls and close for you, look at a sales outsourcing firm. We install acquisition. Your team sells.

Outbound and prospecting agencies

These agencies go and find your buyers: cold email, LinkedIn, and for some of them the phone. Pick one when your offer already sells. And when the limit is how many of the right people hear about it.

Kaizen

• Base: province of Liège. Working sessions at your office or in Liège. The rest by video.
• What they do: install personalised, automated prospecting for B2B SMEs. Then add ads and inbound to the same system.
• Channels: email and LinkedIn first. Ads and inbound come after the month 3 review. Never in the first three months.
• Languages: French, Dutch and English. Each message is written in the buyer's language.
• Who it's for: B2B SMEs whose offer already closes deals, with someone to take the calls.
• How they charge: two ways in. A fixed-price proof of concept that validates the ICP and the message, then a monthly retainer. Or a three-month engagement, invoiced monthly. The ad budget never goes through us.
• Proof: we tested channels, creatives and angles for one client. That cut their cost per lead by more than 10x.
• Honest limit: no phone prospecting, email and LinkedIn only. We never name our clients, so references are shared on a call. Three-month minimum.

At month 3, we hold a joint review. You see the meetings booked and the pipeline created. Then you decide whether we keep going, no strings attached. The guarantee is in writing. If the system hasn't produced at least 10 interested prospects after the first three months, we keep working for free until it has. We take only 5 new clients per quarter. So there can be a wait.

Leadix

• Base: Watermael-Boitsfort, Brussels. The site is in French, with an English version.
• What they do: B2B outbound built on data, AI and automation. The goal is a steady flow of qualified meetings that your team then closes. They also coach internal teams on go-to-market.
• Channels: cold email, LinkedIn prospecting and account-based marketing.
• Languages: international campaigns, "whatever the language", in their words.
• Who it's for: B2B companies with established commercial traction and a high customer lifetime value. Their site sets explicit entry criteria on both.
• How they charge: a monthly retainer.
• Honest limit: with those entry criteria, an early-stage company may not qualify. And the site doesn't say who owns the database and sequences at the end.

Frontal

• Base: Belgian founders, clients worldwide.
• What they do: build revenue systems for sales, marketing and RevOps. That means a data foundation, a layer that watches buying signals, and workflows that route each account to the right action.
• Channels: outbound email, LinkedIn, paid ads on LinkedIn, Google and Meta, and founder content.
• Languages: not published.
• Who it's for: B2B companies past product-market fit, with a large average deal and a focused set of target accounts.
• How they charge: a fixed engagement for a 90-day build. Then month to month, if they run the execution for you.
• Honest limit: it's built around a focused list of target accounts. So it fits less well if you sell to a wide market. If Belgium is your main market, ask about Dutch and French.

Frontal is explicit about ownership. The whole engine is documented inside your own tools, "yours to run, or have us run it." They also promise a first play live in 30 days, or the first month free.

Seventic

• Base: headquarters in Paris. Its own ranking of agencies in Belgium presents Belgian, native French-speaking SDRs.
• What they do: book qualified meetings, generate leads and detect projects for sales teams. Their line: "We prospect, you close."
• Channels: phone prospecting, email campaigns and LinkedIn social selling.
• Languages: French plus several European languages, Dutch and English included.
• Who it's for: B2B companies in tech and SaaS, consulting, marketing and communications, industry and finance.
• How they charge: not published.
• Honest limit: they work from their own proprietary database, which they describe as never resold. So the contact list stays with them, not with you.

Their SDRs are experienced salespeople: "5 to 15 years", in their words. Each one is native to the client's sector.

Skondras

• Base: Amsterdam, with activity in the Netherlands, Belgium, Germany and Spain.
• What they do: B2B lead generation, sales outsourcing and customer service outsourcing.
• Channels: cold calling by their own sales professionals, email campaigns and LinkedIn sequences.
• Languages: Dutch, French, English and German, run by native speakers.
• Who it's for: B2B companies selling to decision-making units in more than 50 sectors, from logistics and IT to energy and finance.
• How they charge: per qualified appointment, validation and reporting included.
• Honest limit: the service is built around calls by their own agents. And paying per appointment rewards the number of meetings. Check how they define "qualified" before you sign.

WinPeo

• Base: Brussels.
• What they do: three layers. Consulting: go-to-market strategy and sales playbooks. Integration: CRM, automation and AI set up for sales. Execution: "Sales-as-a-Service", running the sales operation end to end, from lead generation to closing.
• Channels: not published.
• Languages: not published.
• Who it's for: growing B2B companies that want to scale revenue and their sales system.
• How they charge: not published.
• Honest limit: this goes beyond lead generation. It's sales outsourcing, closing included. Exactly right if you want to hand over the whole sales function. More than you need if you only want meetings.

Marketing, ads and inbound agencies

These agencies bring buyers to you: paid ads, search, content, and pages that convert. Pick one when your buyers already search for what you sell. Or when your name needs to be in front of an account list before anyone contacts it.

Customer Impact

• Base: Antwerp, remote-first, with partners in Amsterdam, Rotterdam, Berlin and Paris.
• What they do: SEO and AI visibility, paid advertising, content, websites, conversion work, marketing automation and branding.
• Channels: Google Ads, LinkedIn Ads, Meta, Reddit, TikTok, programmatic display, search and content.
• Languages: Dutch, French and English.
• Who it's for: B2B companies with long sales cycles, notably SaaS, facility services and industry.
• How they charge: fixed price tiers per service, a three-month minimum, no annual contract. Ad management fees are billed separately. No percentage is taken from your media budget.
• Honest limit: their service list centres on search, ads and conversion. If you need cold outbound to named accounts, ask what they run in-house.

They measure themselves on "the enquiries that land in your CRM". Not clicks. Not rankings. The team is small and senior, and the specialist sits at the table.

ClickForest

• Base: Bonheiden, near Mechelen, working across Flanders.
• What they do: digital marketing, AI automation, websites and Shopify e-commerce.
• Channels: Google Ads, Meta Ads, LinkedIn Ads, SEO, AI search visibility, conversion optimisation and email marketing.
• Languages: Dutch, English and French.
• Who it's for: Flemish SMEs and scale-ups in B2B services and e-commerce.
• How they charge: monthly contracts, cancellable month to month, no long lock-in.
• Honest limit: a Flanders focus, and e-commerce is one of their core offers. A Walloon B2B company should check the depth of their French-language work.

The approach is founder-led, with a network of senior freelancers. They steer on net profit. Not clicks, not likes.

Connexion

• Base: Tournai, with offices in Brussels and Paris.
• What they do: lead generation through paid acquisition, landing pages, server-side tracking, email nurturing and CRM integration.
• Channels: Google Ads, Meta and LinkedIn, plus nurturing emails.
• Languages: French and English.
• Who it's for: B2B and B2C services, SaaS and start-ups, and construction.
• How they charge: a monthly agency fee in tiered packages, media budget separate.
• Honest limit: the model is paid-led, so the pipeline depends on ad budget. And it serves B2C as well as B2B.

They steer on cost per qualified lead, not on the number of forms filled. And they track each lead from the first click to the signature.

Qonversio

• Base: Tournai.
• What they do: digital marketing strategy, content production and paid campaigns built to convert. Four steps: clarify, structure, activate, optimise.
• Channels: Meta, Google and LinkedIn ads, websites and e-commerce, video and UGC, design, lead generation.
• Languages: French and English.
• Who it's for: B2B and B2C companies that want structured digital growth.
• How they charge: not published.
• Honest limit: a generalist marketing agency with heavy creative production. It serves B2B and B2C alike, rather than B2B prospecting.

The ten agencies side by side

"Not published" means the agency's own website doesn't say. It doesn't mean the answer is bad. It means it's the first question for your call.

How these agencies charge

No two agencies on this list publish the same kind of offer. So comparing headline prices tells you little. Compare the models instead, and what each one pushes the agency to do.

• Monthly retainer: Leadix. You pay for the team's time every month, whatever the number of meetings. It's predictable. It lets them rework what gets no replies. Judge it on meetings held, not on activity.
• Per qualified appointment: Skondras. You pay for results you can count. The risk is the definition. A meeting with the wrong person still counts, unless "qualified" is written down.
• Fixed build, then run: Frontal. A set fee to build the system over 90 days. After that, you run it yourself, or you pay month to month for them to run it. This model most clearly leaves you owning something.
• Fixed tiers per service, three-month minimum: Customer Impact. You know the price of each service upfront. And three months is enough time to read real numbers.
• Monthly tiers, media budget separate: Connexion. A monthly fee to manage the campaigns. The ad spend itself goes to Google, Meta or LinkedIn. Check whether that budget passes through the agency or you pay it directly.
• Monthly and cancellable: ClickForest. No long lock-in: you can leave any month. The flip side: nothing forces either side to give a channel the months it needs.
• Proof of concept, then retainer: Kaizen. A fixed price to validate the ICP and the message. Then a monthly retainer, once it works. Or three months, invoiced monthly.

Seventic, WinPeo and Qonversio don't publish their billing model. Ask on the first call. Renting capacity or building it yourself? That trade-off is covered in outbound agency vs in-house SDR.

Prospecting in Belgium means three languages

If you write to buyers, Belgium is one country and three markets. Same promise. Only the writing changes, reader by reader.

In practice, that means three things:

1. One campaign per language and region. French for Wallonia and French-speaking Brussels. Dutch for Flanders. English for international head offices. Each one gets its own list, its own examples and its own follow-ups.
2. A translated message fails. A cold email is short. Every word carries weight. And a buyer notices within one line that the text was written in another language first. Idioms differ between a Flemish and a Walloon buyer. So does the formal or informal register. So does the way you propose a meeting.
3. The list decides the language, not the agency. The right language is the reader's, not the head office's. A Flemish decision-maker at a company based in Brussels reads Dutch.

Several agencies on this list cover all three languages. Others focus on one region. That's fine if your market is there. The mistake is buying a French-only service to reach Flanders. Or the reverse. For the rest of the outbound method, see the B2B outbound sales strategy.

FAQ