Google controls 92% of the search engine market in Belgium. Paid search (SEA) — Google Search Ads, Google Shopping, Display and Performance Max — is the most powerful and most immediate acquisition lever in digital: your ad appears at the top of Google within hours. Provided you know how to use it.

Poorly configured Google Ads campaigns burn euros for nothing: keywords that are too broad, generic ads, landing pages that don't convert, anemic ROAS. The difference between a campaign that generates profit and one that bleeds the bank account comes down to a few dozen technical and strategic settings that most Belgian advertisers don't master.

At Ligne 1, a PPC agency in Belgium, we manage your Google Ads campaigns with the rigor of a quantitative trader and the eye of a marketing expert. Our approach: precise campaign architecture, maximum Quality Score, calibrated smart bidding and granular conversion tracking — for a ROAS that improves every month.

92%

of the Belgian search market captured by Google

8:1

average ROAS of well-optimized Google Ads campaigns (source: Google Economic Impact)

Google Search Ads: capturing demand at the exact moment of search

Google Search Ads campaigns are the advertising format with the strongest purchase intent: your ads appear directly in Google results when a user types exactly the keywords matching your offer. Unlike Display or social networks, you don't create a need — you answer a demand that has already been expressed.

The key to a high-performing Search campaign is the architecture of the ad groups and the selection of keywords. A common mistake among novice Belgian advertisers: targeting keywords that are too broad (Google's default "broad" match), which trigger ads on irrelevant queries and waste a significant share of the advertising budget.

Optimal Search campaign architecture

  • SKAG or tightly themed structure — One ad group per specific theme or product, with 5 to 15 closely related keywords. This structure maximizes ad/keyword relevance, the cornerstone of Quality Score.
  • Well-managed match types — Exact match [keyword] for high purchase-intent queries, phrase match "keyword" for controlled discovery. Broad match reserved for discovery campaigns with dense exclusion lists.
  • Exhaustive negative keyword list — Systematically block unqualified terms: "free", "training", "job", "reviews" (if not relevant), competitor names (unless a deliberate competitive strategy), queries outside the target geographic area.
  • Optimized Responsive Search Ads (RSA) — RSAs combine up to 15 headlines and 4 descriptions that Google assembles dynamically. The quality of each individual headline and description is crucial: every element must make sense on its own AND in combination with the others.
  • Complete ad extensions — Sitelinks, structured snippets, callouts, phone calls, location, price, promotions: extensions increase click-through rate (CTR) by 15 to 40% and improve Quality Score at no extra cost.

Quality Score: the most underestimated factor

The Quality Score is the rating from 1 to 10 that Google assigns to each keyword in your account. It combines three components: ad relevance (is the keyword in the ad headline?), landing page experience (does the landing page match the promise of the ad?) and expected click-through rate (estimated CTR based on history).

A high Quality Score (8-10/10) reduces your cost per click by 20 to 50% compared with a competitor with a low score (3-4/10), even if you bid less. Improving Quality Score is the highest-ROI action in Google Ads management — and this is where an agency's expertise makes the difference.

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A Quality Score of 10/10 can reduce your CPC (cost per click) by 50% compared with a competitor with a score of 4/10 on the same query. At Ligne 1, we systematically aim for an average Quality Score above 7 on your priority keywords.

Google Shopping & Performance Max: dominating Belgian e-commerce

For e-commerce businesses and shops with a product catalog, Google Shopping campaigns and their automated evolution, Performance Max, are the most profitable SEA levers. Shopping ads display photo, title, price and store name directly in Google results — with a click-through rate (CTR) 2 to 3 times higher than text ads for purchase queries.

Optimizing the Google Merchant Center product feed

The quality of a Shopping campaign depends 70% on the quality of the product feed submitted to Google Merchant Center. The most critical attributes are:

  • Optimized product title — The title is the equivalent of the keyword in Search. It must contain the most relevant search terms at the beginning of the title: brand, product type, key characteristics (colour, size, material), model. Example: "Nike Air Max 270 Men's White Size 42" rather than "Nike shoe".
  • Enriched description — The description feeds Google's algorithm to match your products to long-tail queries. It must contain the full lexical field of your product category.
  • High-quality images — A white background is mandatory for main images. Multiple angle shots increase CTR. Minimum resolution 800x800 px, ideally 1000x1000 px.
  • Precise Google categorization — Use the most specific Google Product Taxonomy possible. "Apparel & Accessories > Shoes > Sports Shoes" is preferable to "Shoes".
  • Correct GTIN / EAN — For branded products, the EAN barcode is mandatory and allows Google to match your product with the queries of shoppers comparing prices.
  • Up-to-date prices and promotions — A price mismatch between the feed and the website leads to the product being suspended in Merchant Center. Promotions must be submitted through GMC's Promotions tool to appear in ads.

Performance Max: Google AI working for your ROAS

Performance Max is the campaign type that gives Google maximum autonomy to serve your ads across its entire advertising inventory: Search, Shopping, Display, YouTube, Gmail and Google Maps — with a single defined goal: your target ROAS or target CPA.

PMax uses audience signals, the creative assets provided (images, videos, text) and conversion data to automatically build the best-performing ads and serve them at the right time, on the right channel, to the right audience. Its power is real — but it requires precise initial setup and rigorous monitoring to avoid budget drift.

  • Quality audience signals — The more first-party data you provide (customer lists, site visitors, past converters) as audience signals, the faster PMax learns and the better it performs.
  • Diverse creative assets — Providing as many assets as possible (images in multiple formats, short 15-30s videos, varied headlines) lets the algorithm test and identify winning combinations.
  • Brand and term exclusions — Configure keyword exclusions at campaign level via Google Ads Support (standard PMax exclusions are limited) to avoid cannibalizing your branded Search campaigns.
  • Precise conversion goals — PMax needs to know exactly what a conversion is for your business: purchase, completed form, call, store visit. Vague goals produce vague results.
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At Ligne 1, we audit your Google Merchant Center feed and your current Shopping campaigns to identify revenue losses caused by feed errors, under-optimized bids and uncovered product segments.

Google Display & Remarketing: re-engaging prospects, retaining customers

The Google Display Network reaches more than 90% of internet users worldwide through banner ads shown on more than 2 million websites, apps and Google properties (YouTube, Gmail). Unlike Search, which captures existing demand, Display creates demand and builds awareness.

Remarketing is the most profitable Display feature: it lets you re-engage users who have already interacted with your site or brand. With conversion rates up to 3 times higher than cold acquisition campaigns, remarketing is an indispensable tool in any effective digital conversion funnel.

Advanced Display targeting types

  • Standard remarketing — Show your ads again to visitors of your website. Segment by page visited (home ≠ product page ≠ cart page) to personalize the message according to the level of engagement.
  • Dynamic remarketing — For e-commerce, automatically display the exact products each user viewed or added to their cart. Significantly higher conversion rate than static remarketing.
  • Similar Audiences — Google identifies internet users with profiles close to your existing customers (browsing behavior, interests, demographics). Ideal for qualified audience expansion.
  • In-Market audiences — Target users that Google identifies as "actively researching" in your category. Example: "In-Market for accounting software" or "In-Market for real estate agencies".
  • Customer Match — Upload your customer list (emails, phone numbers) to directly target your existing customers on Google Search, Display, YouTube and Gmail. Ideal for loyalty and upsell campaigns.
  • Contextual targeting — Serve your ads on sites covering specific topics related to your sector. An alternative to third-party cookies in a post-tracking-consent world.

Display creative best practices

  • Responsive Display Ads (RDA) — Provide several image formats (square, landscape, logo) and several texts. Google assembles the best combinations and automatically adapts them to each ad placement.
  • Clear message and visible CTA — A Display banner has less than a second to grab attention. The main benefit and the call to action must be readable at a glance, even in a small format.
  • Ad / landing page consistency — A user who clicks on a banner saying "Get our SEO audit" should land on a page dedicated to the SEO audit — not the generic home page. A break in the message increases bounce rate and destroys conversion.
  • Frequency capping — Limit the number of impressions per user per day (recommendation: 3 to 7 impressions/day) to avoid ad saturation and the rejection effect that harms the brand.

Audience targeting and bidding strategies: the science of advanced SEA

Google Ads is no longer just a keyword ad platform. It is a platform for activating sophisticated audiences where behavioral, demographic and contextual signals make it possible to deliver the right message to the right person at the right time — with precise control of cost per acquisition.

Google smart bidding strategies

  • Target CPA (target cost per acquisition) — Google automatically adjusts bids to get the maximum number of conversions at your target CPA. Ideal for lead generation campaigns with a defined maximum acceptable acquisition cost.
  • Target ROAS (target return on ad spend) — Google optimizes bids to maximize conversion value at the defined ROAS. Perfect for e-commerce businesses with variable order values.
  • Maximize Conversions — Google maximizes conversion volume with no CPA constraint. To be used in the start-up phase to accumulate conversion data, before switching to Target CPA.
  • Enhanced CPC (eCPC) — A semi-automatic variant of manual bidding. Google raises or lowers your manual bid in real time according to the probability of conversion. A good compromise between control and automation for accounts with little data.
  • Segment-based bidding — Apply bid adjustments according to device (mobile, desktop, tablet), time of day, day of the week, location, or audience type. Example: +30% for remarketing users on mobile between 6 pm and 10 pm.

Advanced audience segmentation

  • Observation vs targeting audiences — In "observation" mode, you collect performance data by segment without restricting delivery. In "targeting" mode, you limit delivery to the selected audience. Always start with observation to avoid cutting off unsuspected converting clicks.
  • Funnel segmentation — Different audiences according to the stage of the buying journey: awareness (broad audiences, educational messages), consideration (site visitors, comparative messages), conversion (abandoned carts, urgency and reassurance messages).
  • Enriched first-party audiences (GA4 + Ads) — Connecting Google Analytics 4 to Google Ads makes it possible to activate audiences based on complex behaviors: users who viewed more than 5 pages, spent more than 3 minutes on the site, filled in a form but did not complete the order.
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Ligne 1 deploys a 360° audience plan for each client Google Ads account: funnel mapping, behavioral segmentation, segment-level bidding strategies and continuous A/B tests to maximize ROAS at every stage of the buying journey.

Conversion tracking: measuring what really matters

Conversion tracking is the centerpiece of any profitable Google Ads strategy. Without precise measurement of the actions your visitors take after clicking an ad, it is impossible to optimize intelligently. You are flying blind.

Yet, according to our audits of Belgian Google Ads accounts, more than 60% of SME advertisers have incorrect, partial or inconsistent conversion tracking — which skews all their optimization decisions and artificially inflates their performance metrics.

The conversions to measure by sector

  • E-commerce — Purchase (with dynamic order value), add to cart, checkout initiation, newsletter sign-up, product page view (micro-conversion).
  • B2B / Services — Completed contact form, phone call (minimum duration 60 seconds), brochure/white paper download, online appointment booking, chat initiated.
  • Local / Point of sale — Call from the ad (call extension), request for directions to your premises (from Google Maps), store visit (Store Visit Conversions via GPS).
  • SaaS / Subscriptions — Free trial sign-up, account activation, trial → paid conversion (with weighted customer lifetime value for bidding).

Recommended tracking stack

  • Google Tag Manager (GTM) — Centralize all your tracking tags (Google Ads, GA4, LinkedIn, Meta) without developer involvement. GTM enables fast deployments and A/B tests of tracking.
  • Google Analytics 4 (GA4) — The source of truth for behavioral analysis. GA4 events are imported into Google Ads as secondary conversions to enrich algorithmic optimization.
  • Enhanced Conversions — Sends hashed first-party data (email, phone) at the time of a conversion to improve tracking accuracy in an environment without third-party cookies. Improves the volume of measured conversions by 15 to 25% according to Google.
  • Google Ads Conversion Import via Salesforce/CRM — For long sales cycles, importing offline conversions (contract signature, first payment) from your CRM into Google Ads lets you optimize campaigns on the real business value generated.
  • Data-driven attribution model — Rather than the "last-click" model, which gives 100% of the credit to the last click, the data-driven model distributes credit to each touchpoint in the buying journey according to its actual contribution to the conversion.
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A tracking audit is included in every Ligne 1 onboarding. We check the implementation of every tag, the consistency of data between GTM, GA4 and Google Ads, and fix errors before touching bids or budgets.

SEO + SEA synergy: when the two levers reinforce each other

SEO and SEA are not alternatives — they are complementary levers that amplify each other when managed in a coordinated way. At Ligne 1, an agency with dual expertise in SEO and Google Ads, we deploy strategies that make full use of this synergy.

How SEO and SEA reinforce each other

  • Full SERP coverage — On your most competitive keywords, combining a Search ad in position 1 AND an organic result in the top 3 doubles your visibility and sends a credibility signal to users. Studies show that this double presence increases combined CTR by 25 to 35%.
  • SEA data → SEO insights — Google Ads campaigns generate real-time keyword performance data (CTR, conversion rate, cost per click). This data reveals which keywords really convert — valuable information for prioritizing the SEO content strategy.
  • SEO data → SEA keyword selection — The best-ranking organic SEO pages reveal the most relevant search intents for your business. These signals guide keyword selection in your Search Ads campaigns.
  • SEA to cover temporary SEO gaps — While SEO ramps up (3 to 6 months for first rankings), SEA campaigns ensure immediate visibility on strategic queries. Once SEO is operational, the SEA budget can be redirected to expansion or awareness campaigns.
  • SEA remarketing on SEO traffic — Incoming organic traffic (users who clicked on a natural result) is captured in Google Ads audience lists for remarketing. You "monetize" each SEO visitor twice: organic first, then a targeted paid follow-up.
  • Accelerated A/B tests via SEA — Quickly test landing pages, value propositions or CTAs through Google Ads (results within days) before rolling out the winning versions on SEO pages (whose impact takes weeks to measure).

Optimal SEO + SEA budget allocation

The optimal split between SEO budget and SEA budget depends on your sector, your digital maturity and your short/long-term objectives. Here is our indicative framework:

  • Launch phase (0-6 months) — More aggressive SEA (60-70% of the digital budget) to generate traffic and leads immediately while SEO is being built. SEO invested in parallel for technical foundations and content.
  • Growth phase (6-18 months) — Gradual rebalancing in favor of SEO as organic rankings become established. SEA focused on competitive, high-value transactional queries.
  • Maturity phase (18 months+) — SEO dominant (lower average CPC thanks to organic density), SEA concentrated on brand defense, new offers and seasonal peaks.
Frequently asked questions

Your questions about Google Ads and SEA in Belgium

What is the minimum budget to launch a Google Ads campaign in Belgium?

Google Ads does not impose a minimum budget. In practice, an investment of €500 to €1,000 per month provides statistically meaningful data on most Belgian markets. Highly competitive sectors (insurance, real estate, law, finance) generally require €2,000 to €5,000 per month to be competitive. Ligne 1 analyzes your market, your sector average CPCs and your objectives to define the optimal budget — neither under-investment that prevents the algorithms from learning, nor over-investment that would weigh on your ROI.

How long does it take for a Google Ads campaign to become profitable?

The first data arrives immediately after launch. Google's smart bidding algorithm goes through a learning phase of 2 to 4 weeks — during which performance is more variable. Fully optimized campaigns reach their target ROAS in 4 to 8 weeks depending on the volume of conversions generated. Accounts with a high volume of conversions learn faster: this is why we recommend not pausing or massively changing a campaign during its learning phase.

What is the difference between SEO and SEA?

SEO generates unpaid organic traffic, but its results take 3 to 6 months to materialize. Once rankings are established, traffic is lasting with no cost per click. SEA (Google Ads) generates immediate paid traffic, controllable by query, audience and budget — but stops the second the budget runs out. The two are complementary: we generally recommend combining them to maximize total SERP coverage and the data synergies between the two channels.

Performance Max or Search campaigns: which should you choose?

Search campaigns offer precise control over keywords and are ideal for capturing specific demand with a highly targeted message. Performance Max automates delivery across all Google channels and excels for e-commerce businesses with a product catalog, broad awareness campaigns and advertisers with solid conversion data to feed the AI algorithm. In practice, we recommend combining both types: Search for high purchase-intent queries, PMax for expansion and multi-channel coverage.

How can I improve the ROAS of my current Google Ads campaigns?

The priority levers for improving ROAS are: improving Quality Score (ad relevance + landing page), building up negative keyword lists, switching to Target ROAS smart bidding if you have 30+ conversions/month, optimizing landing pages (speed, CTA clarity, reassurance), structuring remarketing audiences and cleaning up high-CPA campaigns. A full account audit identifies the 5 highest-impact actions specific to your situation.

Can Ligne 1 manage my existing Google Ads campaigns?

Yes. We offer to take over management of existing Google Ads accounts after a full audit. This audit identifies budget waste, structural errors, tracking problems and untapped opportunities. The takeover includes a stabilization period (fixing the identified problems) followed by a continuous optimization phase. Most of our clients who hand over an existing account see their ROAS improve significantly within the first 60 days.

How does Google Ads remarketing work?

Remarketing shows your ads to users who have already visited your site or interacted with your brand. Via Google Tag Manager and a remarketing tag (gtag.js), you create audience lists segmented by on-site behavior: page visited, product viewed, abandoned cart, form started but not submitted. These audiences are then targeted through Display, YouTube, Gmail or even Search (RLSA) ads. Remarketing generally delivers a ROAS 2 to 4 times higher than cold acquisition campaigns because you are re-engaging prospects who are already qualified.

Maximize your Google Ads ROAS

Campaign audit, creation from scratch or takeover of management: let's talk about your Google Ads objectives. Ligne 1 analyzes your current account and identifies the levers for immediate improvement — Search, Shopping, Performance Max or Display.

Free Google Ads audit → Our SEO offer