Set up GA4 for a small business: a practical guide

Measurement supports marketing decisions. Without accurate data, you cannot tell whether advertising pays, which pages generate customers or where visitors leave. Yet Gartner reports that only 54 percent of marketing decisions are influenced by analytics. The rest rely on intuition.

Belgian small businesses face a further gap. FPS Economy reports that 71,8 percent of micro-businesses have a website, but only 22,7 percent offer online ordering or booking. Being online without measurement is like opening a shop without counting customers. GA4 is free, and a sound basic configuration can be completed in an afternoon.

At analytics.google.com, create an account and property. Select Belgium as the country and euro as the currency. Your measurement ID begins with G-.

• Using WordPress, Shopify or Wix? Choose the built-in integration or one plugin, not two.
• Planning for later changes? Install Google Tag Manager (GTM) and load GA4 through a GA4 configuration tag. You can then add conversion and other tags without repeatedly changing website code.

The common beginner error is duplicate installation through both a plugin and Tag Manager. This can double the measurement and make performance appear twice as strong. Check that the measurement code loads through one route.

Review these settings in Admin after installation:

1. Set data retention to 14 months. GA4 retains event data for only 2 months by default. Choose 14 months to support detailed comparisons with the previous year.
2. Exclude internal traffic. Define the office IP address as internal and filter it so your visits do not distort customer figures.
3. Review Google Signals and enhanced measurement. Know which scroll, outgoing-click, site-search and download measurements are enabled.
4. Check time zone and currency. Select Brussels and euro, particularly on a site built by a supplier abroad.

These four changes take around twenty minutes but affect whether the data remains useful a year later. Complete them early: settings such as retention apply forwards, not retrospectively.

This separates counting visits from measuring results. A key event is an interaction you identify as valuable, such as a completed form, telephone-link click, quote request or purchase.

Choose three to five outcomes tied to revenue. Forty unrelated events are less useful than five well-chosen ones. A service business might measure form submission, telephone clicks and email clicks. A shop might measure purchases, checkout starts and basket additions.

Test each event. Around 40 percent of GA4 setups have at least one incorrectly configured event. Use DebugView to check receipt before relying on it for decisions.

Two free integrations extend the picture:

• Google Search Console shows queries where the site appears and receives clicks. Linking brings search data into GA4.
• Google Ads, if you advertise, can import key events for bidding. Avoid counting the same action both through Ads measurement and a GA4 import, which can make conversion cost appear half its real value.

Since 2026, GA4 also recognises traffic from AI assistants such as ChatGPT and Gemini as a separate channel, helping identify visitors from this growing source.

Three familiar problems deserve attention:

1. Missing consent integration. Since July 2025, Google enforces Consent Mode v2 for European traffic. If the banner is not connected correctly, substantial measurement can stop without an error message.
2. Duplicate tagging. A plugin alongside Tag Manager can double counting. Choose one route.
3. Collecting without reviewing. Reserve fifteen minutes weekly for visitor origins, actions and outcomes.

Installation is not configuration. Key events, suitable settings and correct consent integration make the difference.

Unsure whether Analytics, conversions and the cookie banner are connected correctly? Try the free marketing scan from Marketing Scan for a plain-language overview of visible strengths and priorities.