Technical SEO Checklist for Belgian Websites

Technical SEO is the foundation that determines whether search engines can effectively crawl, index, and rank your website. For Belgian businesses operating multilingual sites, technical SEO is even more critical because mistakes get multiplied across every language version. This checklist covers the essential technical SEO elements every Belgian website should have in place.

Crawling and Indexing Fundamentals

Before search engines can rank your pages, they need to find and understand them:

1. XML sitemap — create and submit XML sitemaps for each language version of your site. Include only canonical, indexable pages. Keep sitemaps under 50,000 URLs and update them automatically when content changes.
2. Robots.txt — ensure your robots.txt file allows crawling of all important pages and resources. Block only admin areas, duplicate content paths, and internal search result pages. Check that you are not accidentally blocking CSS or JavaScript files that Googlebot needs to render your pages.
3. Crawl budget — for larger Belgian sites (1,000+ pages across languages), monitor crawl stats in Google Search Console. Remove low-value pages from the index, fix redirect chains, and ensure important pages are easily accessible within three clicks from the homepage.
4. Canonical tags — every page should have a self-referencing canonical tag. For multilingual sites, each language version gets its own canonical URL. Never point all language versions to a single canonical.
5. Index coverage — regularly check Google Search Console for indexing errors. Common issues include soft 404s, redirect loops, and pages blocked by robots.txt. Fix these promptly to maintain crawl efficiency.

Site Architecture and URL Structure

A logical site structure helps both users and search engines navigate your content:

• Flat architecture — keep important pages within three clicks of the homepage. Deep pages get crawled less frequently and pass less link equity.
• Descriptive URLs — use clean, keyword-rich URLs like /nl/diensten/webontwikkeling rather than /nl/page?id=123. Include the language prefix in the URL path for multilingual sites.
• Breadcrumb navigation — implement breadcrumbs with structured data markup. This helps users understand their location and gives search engines additional context about your site hierarchy.
• Internal linking — create a deliberate internal linking strategy. Link from high-authority pages to important target pages. Ensure every page receives at least two internal links.
• Navigation consistency — maintain consistent main navigation across all pages and language versions. Use translated navigation labels rather than keeping everything in one language.

Performance and Core Web Vitals

Google uses Core Web Vitals as ranking signals. Belgian websites must meet these thresholds:

• Largest Contentful Paint (LCP) — under 2.5 seconds. Optimise your hero images, use modern formats (WebP/AVIF), implement lazy loading for below-the-fold content, and ensure your server responds quickly.
• Interaction to Next Paint (INP) — under 200 milliseconds. Minimise JavaScript execution time, break up long tasks, and use web workers for heavy computations. This replaced FID as of March 2024.
• Cumulative Layout Shift (CLS) — under 0.1. Set explicit dimensions on images and embeds, use CSS aspect-ratio properties, and avoid injecting content above existing content after page load.
• Server response time — aim for a Time to First Byte (TTFB) under 800 milliseconds. Use quality hosting with European servers, implement caching, and consider a CDN for static assets.

Structured Data and Rich Snippets

Structured data helps search engines understand your content and can earn you enhanced search result displays:

• Organisation schema — add Organisation or LocalBusiness markup with your company name, address, phone number, and logo. This supports local SEO efforts.
• Breadcrumb schema — mark up your breadcrumb navigation to display the site hierarchy in search results.
• FAQ schema — add FAQ markup to relevant pages to earn expanded search result listings with question-and-answer dropdowns.
• Article schema — mark up blog posts with Article structured data including author, publication date, and modified date.
• Product schema — for e-commerce sites, add Product markup with price, availability, and review ratings to display rich product snippets.
• Validation — test all structured data with Google's Rich Results Test tool. Fix any errors or warnings before deploying.

Mobile and Accessibility

Google uses mobile-first indexing, meaning the mobile version of your site is what gets crawled and ranked:

1. Responsive design — your site must work flawlessly on all screen sizes. Test on actual mobile devices, not just browser developer tools.
2. Touch-friendly elements — buttons and links need adequate size (minimum 48x48 pixels) and spacing to be easily tappable on mobile screens.
3. No intrusive interstitials — avoid full-screen popups that cover content on mobile. Google penalises sites with intrusive interstitials.
4. Viewport configuration — set the viewport meta tag correctly to prevent scaling issues on mobile devices.
5. Accessibility basics — alt text on images, proper heading hierarchy, sufficient colour contrast, and keyboard navigation. The European Accessibility Act (effective June 2025) makes this increasingly important for Belgian businesses.

Security and HTTPS

Security is both a ranking factor and a trust signal:

• HTTPS everywhere — all pages must be served over HTTPS. Redirect all HTTP requests to HTTPS. Ensure no mixed content warnings appear.
• Security headers — implement Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, and Strict-Transport-Security headers.
• Regular updates — keep your CMS, plugins, and server software up to date. Outdated software is the primary attack vector for website compromises.

How ICTLAB Can Help

ICTLAB conducts comprehensive technical SEO audits for Belgian businesses through our web and digital services. We identify issues holding back your search performance, prioritise fixes by impact, and implement solutions that deliver measurable ranking improvements. From on-page SEO to server configuration and structured data implementation, we ensure your website meets the highest technical standards for search engine visibility.