Technical SEO audit

You rarely see technical SEO problems on your screen. You notice them by their effects:

• New pages don't show up in search results, or only after weeks.

• Your traffic dropped after a relaunch or migration, and it isn't coming back.

• Your site is slow on mobile, and nobody can tell you why.

• You already have an SEO report, but nobody acts on it.

• Visitors in the Netherlands get your Belgian page, or the other way around.

That's rarely down to your copy. The cause is usually technical: how your site is built, how your CMS is set up and how search engines read it. That's where a technical SEO audit starts.

You finally know what's wrong.
No more guesswork. You get a list of causes, not just symptoms.

You fix what matters most first.
Every task is grouped and estimated. You see upfront what each step costs and what it brings.

You stop missing out on customers.
A page search engines can't find brings in no leads. The more of your pages are properly indexed, the more chances you get.

One partner, from diagnosis to fix.
No more back and forth between an SEO agency and your developers. The team that finds the problem can also fix it.

Your site is ready for AI search.
ChatGPT, Perplexity and Google AI Overviews read your site differently than a visitor does. We check whether they can reach and understand your content.

SEO has four parts. We're strong in one of them, and we'd rather be upfront about that.

• Keyword research: finding out what your audience searches for. At Blastic: through a partner.

• Technical SEO: making sure search engines and AI tools can find, read and index your site. At Blastic: our specialty.

• On-page SEO: aligning copy, titles and headings with keywords. At Blastic: through a partner.

• Off-page SEO: links and mentions on other sites. Not something we do.

The best copy won't help if search engines can't find your pages. That's where we start.

A technical SEO audit at Blastic looks at your site the way search engines and AI tools do. Then we look in the code and the CMS to find where each problem comes from.

We scan your entire website, including sites with more than 300 pages. We test your key pages with Lighthouse, analyse the data in Google Search Console and run an AI scan.

1. Crawling and indexing. Robots.txt, sitemap and noindex: can crawlers reach the pages you want to be found?

2. Canonicals and hreflang. Do search engines know which page is the original, and which language or country version belongs to which visitor?

3. Site structure and links. Internal links and broken links: how easily do crawlers find your most important pages?

4. Speed and Core Web Vitals. Images that are too large or load the wrong way, render-blocking files, caching, compression and minification.

5. Mobile. Google looks at the mobile version of your site first. Does it work as well as the desktop version?

6. Redirects and migrations. Redirect chains, 404s and old URLs that still get traffic or links.

7. Structured data. Do search engines and AI tools understand what's on a page: an article, a product, an FAQ?

8. AI crawlers. Do GPTBot and other AI crawlers have access, and is your content there without JavaScript?

The code, from the inside

This is where our SEO audit differs from most. A tool shows what goes wrong. We find where it starts.

• Every finding linked to the code. We review the repository and point out, for each finding, where the problem starts.

• Rendering and platform. How your site uses JavaScript and how your platform is configured. We know Sitecore, Kentico, Umbraco, Kontent.ai and Prepr from the inside.

The CMS, content and settings

Not everything is in the code. Part of it is in what editors fill in every day.

• Titles and meta descriptions, per page and per language.

• Links and images in the content: broken links and missing alt text.

• Settings per page: noindex, redirects and URLs.

The result: tasks, grouped by cause (code or CMS) and estimated. We don't fix CMS issues page by page: we script the corrections, so every affected page is fixed in one go and nothing slips through.

1. Intake. We discuss your goals and platform, and set up access to Google Search Console and your repository.

2. Website audit. We scan your site from the outside.

3. Code and CMS audit. We find the cause of every finding.

4. Report and tasks. You get an SEO report plus grouped, estimated tasks.

5. Review. We go through the results together and follow up in Google Search Console if needed.

6. Implementation (optional). We fix it, in a sprint, with a support contract or through Accelerate.

Lead time: 1 to 3 working days, depending on the number of pages.

An SEO report only has value if someone acts on it. We build and maintain websites on Sitecore, Kentico, Umbraco, Kontent.ai and Prepr ourselves. So the fix sits with the same team as the diagnosis.

• Your site was built by another agency? No problem. We also audit sites we didn't build.

• A different platform, like WordPress? Then we do the audit as part of a migration. Planning a migration or relaunch? Have the audit done first, so you don't lose traffic.

• Choosing implementation after the audit? Then we deduct the price of the audit.

The next step can be a short sprint, a support contract or a track through Accelerate.

Every site is different, but we come across these problems in almost every technical SEO audit:

• hreflang and canonicals that contradict each other. Search engines don't know which version to show, and sometimes pick the wrong one.

• Images that load the wrong way. Lazy where they should load right away, too large or not scaled for mobile.

• Render-blocking CSS and JavaScript. The page waits for files it doesn't need yet.

• No cache revalidation. Visitors and crawlers reload everything every time.

• No compression or minification. Files are larger than they need to be.

• Broken links. Visitors and crawlers hit a dead end.

None of these problems are fixed with a plugin or a copy change. You fix them in the code or in your platform's configuration.

A technical SEO audit costs from €2,500 excl. VAT. After the intake, you get a quote tailored to your site: the number of pages, languages and platforms sets the scope.

If you then choose implementation, we deduct the price of the audit.