Technical SEO Audits Explained Without the Jargon
Most people have been told they need a technical SEO audit without being told what one actually involves. The phrase sounds serious, and the reports that come back often look impressive, full of red flags and percentages. But what is actually being checked, and why does it matter? This is a plain-English walk through what a real audit covers, what the findings usually mean, and where the genuinely important problems tend to hide.
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Start With Crawlability
Before anything else, an audit asks one basic question. Can search engines actually read the site? Googlebot and other crawlers follow links, request pages, and interpret the code they find. If something blocks that process, pages simply do not get indexed.
Common blockers include a misconfigured robots.txt file, a noindex directive left on from a staging environment, or a sitemap that points to URLs the server returns as errors. These are not rare edge cases. They turn up regularly, and they are the kind of thing that looks fine on the surface while quietly doing real damage underneath.
Index Coverage: What Google Has Actually Found
An audit pulls the list of URLs Google has indexed and compares it to what the site actually contains. The gaps between those two things are where problems live.
Duplicate content is a frequent culprit. A single product page might be reachable through four or five different URLs because of trailing slashes, URL parameters, or session IDs. Google picks one version and largely ignores the rest, which means link equity gets diluted and the wrong page can end up ranking. Canonical tags should handle this, but they are often missing, wrong, or pointing in circles.
Thin pages are another pattern worth watching. Automatically generated tag archives, near-empty category pages, paginated results with no unique content. These pages consume crawl budget without contributing anything. In our experience, a site that has let this run unchecked for a year or two can end up with hundreds of indexed pages that nobody searched for and nobody benefits from.
Site Structure and Internal Linking
How a site links to itself tells search engines which pages matter. An audit maps the internal link structure to check whether the most important pages are actually being prioritised.
Orphan pages are a common finding. These are pages with no internal links pointing to them, which means crawlers may never find them at all, regardless of how good the content is. At the other end, some sites funnel almost all their internal links through a single navigation menu and nowhere else, which is a missed opportunity to signal relevance through the body of the content itself.
Depth also matters. A page buried six clicks from the homepage is being treated as low priority, whether that was the intention or not. An audit surfaces this so the structure can be adjusted deliberately rather than left as an accident of how the site grew.
Page Speed and Core Web Vitals
Speed is a ranking signal, but more importantly it affects whether visitors stay. Core Web Vitals measure three specific things, how fast the main content loads, how quickly the page responds to input, and how much the layout shifts during load. Google uses these as part of its broader assessment of page quality.
An audit checks these scores against real-world data where available. Lab scores from tools like PageSpeed Insights give a useful directional read, but field data from the Chrome User Experience Report reflects what actual visitors experienced. The two can diverge significantly, especially on sites that serve a lot of returning visitors with cached assets.
Render-blocking scripts, unoptimised images, third-party embeds that load before anything else. These are the usual causes of a slow Largest Contentful Paint, and they are all fixable once they are identified.
On-Page Technical Signals
This section of an audit tends to get conflated with content work, but there is a distinct technical layer here. Title tags and meta descriptions are checked for duplication, length problems, and missing values. Heading structure is reviewed to see whether it makes logical sense or whether H1 tags are scattered across the page by a theme that does not know better.
Structured data is another area worth checking. Schema markup helps search engines understand what a page is about, whether it is a product, a review, a business listing, or a recipe. Errors in schema often go unnoticed for months. You can check for them directly in Google’s Rich Results Test, and an audit should do exactly that.
What a Real Audit Actually Turns Up
The findings that matter most are rarely the ones that look dramatic in a report. A long list of missing alt attributes is easy to generate and easy to fix. The things that take more time to diagnose are the structural issues, a redirect chain built up over years of migrations, a canonical configuration that contradicts the sitemap, foundational problems that make link building pointless until they are resolved.
One pattern that comes up more than it should is sites where the owner, after the original build, handed things over to a content agency that produced volume without strategy. Hundreds of pages targeting loosely related terms, no internal linking between them, thin word counts. It looks like activity but it dilutes the whole domain. Bad content does not cancel itself out over time. It accumulates.
A thorough audit separates the noise from the things that are genuinely holding a site back. That is the point of it. Not a report full of amber warnings, but a clear picture of what needs fixing first and why.