Technical SEO Audit: What It Checks and How to Read the Results

A technical SEO audit is a systematic check of whether Google (and other search engines) can actually crawl, index and understand your site. It doesn’t look at content quality or backlinks directly — it looks at the plumbing those two things depend on. A site can have excellent content and still rank nowhere if the technical foundation underneath it is broken.

What a technical SEO audit actually checks

A proper audit works through a fixed set of areas, roughly in this order of impact:

• Crawlability — whether search engine bots can reach your pages at all: robots.txt rules, blocked resources, crawl budget waste on low-value URLs.
• Indexation — which pages are actually in Google’s index versus excluded, and whether that split matches what you intended (noindex tags, canonical conflicts, orphaned pages with no internal links pointing to them).
• Site architecture & internal linking — whether your most important pages are easy to reach in a few clicks, and whether link equity flows to the pages that should rank.
• Core Web Vitals & page speed — loading performance, layout stability and interactivity, all of which are measured ranking signals, not just user-experience nice-to-haves.
• Mobile usability — Google indexes the mobile version of your site by default, so anything broken on mobile is a ranking problem, not just a UX one.
• Structured data (schema) — whether your markup is valid and actually matches what’s on the page, which affects eligibility for rich results.
• Canonical tags & duplicate content — whether multiple URLs are competing against each other for the same content, splitting ranking signals instead of consolidating them.
• HTTPS & security basics — a baseline requirement, not a differentiator, but still worth confirming nothing is misconfigured (mixed content, expired certificates, redirect chains).
• XML sitemap accuracy — whether the sitemap actually reflects what’s live, indexable, and current, with lastmod dates search engines can trust.

How to read the results without panicking

Most audit tools return a long list of flagged issues, and the natural instinct is to treat every red flag as equally urgent. It isn’t. The useful way to triage a results list is by what the issue actually blocks:

• Blocks indexing entirely — a page that can’t be crawled or is accidentally noindexed can’t rank at all, regardless of how good the content is. Fix these first.
• Splits or dilutes ranking signals — duplicate content, canonical conflicts, and thin near-duplicate pages competing for the same query. Fix these second.
• Slows down or degrades the experience — Core Web Vitals issues, unoptimized images, render-blocking scripts. Real, but rarely as urgent as the first two categories.
• Cosmetic or best-practice — missing alt text on decorative images, minor heading-order slips. Worth fixing, rarely worth panicking over.

A 200-item audit report is usually 10 items that matter and 190 that don’t move anything on their own. Knowing which is which is most of the value a second set of eyes adds.

DIY tools vs. a professional audit

Free and low-cost tools (Google Search Console, PageSpeed Insights, Screaming Frog’s free tier) will surface most of the mechanical issues above and are worth running yourself before paying anyone. Where a professional audit earns its cost is in the judgment calls the tools can’t make: which of the flagged issues are actually worth fixing for your specific site and competitive set, how issues interact with each other, and what the fix list should look like in priority order rather than as an undifferentiated wall of warnings.

How often to audit

A full audit once or twice a year is enough for most sites, with lightweight monitoring (Search Console coverage reports, uptime/speed alerts) in between. Audit again sooner after a site migration, a major platform or theme change, or a sudden, unexplained traffic drop.

A step-by-step audit process

Whether you run it yourself or hire someone, a sound audit follows roughly the same sequence:

1. Check what Google already sees. Open the Pages report in Google Search Console to compare indexed and non-indexed URLs, and read the reasons given for exclusions such as “Crawled – currently not indexed”, “Duplicate without user-selected canonical” or “Blocked by robots.txt”.
2. Crawl the site. Run a crawler such as Screaming Frog across the whole site to list every URL with its status code, title, meta description, canonical, headings, word count and internal links.
3. Compare the crawl with the sitemap and the index. Pages in the sitemap but not indexed, indexed pages missing from the sitemap, and important pages with no internal links (orphans) all point to problems.
4. Test speed and mobile experience. Check Core Web Vitals in Search Console, which uses real-user data, and spot-check key templates with PageSpeed Insights.
5. Validate structured data. Run important page types through Google’s Rich Results Test and fix errors and warnings.
6. Review redirects and status codes. Look for broken internal links (404s), redirect chains, redirect loops and server errors (5xx).
7. Prioritise. Group findings by what they block, as described above, estimate the effort for each fix, and turn the list into a plan with owners and dates.

Understanding the most common findings

• Noindex on important pages. Often left over from a staging site or a plugin setting. It removes the page from Google entirely and is usually quick to fix.
• Canonical conflicts. A page’s canonical points to a different URL, or several versions of a page (with and without a trailing slash, with tracking parameters, http and https) are all accessible. Google may then pick a version you did not intend.
• Redirect chains. URL A redirects to B, which redirects to C. Each extra hop slows crawling and can dilute signals. Point redirects straight at the final destination.
• Thin or duplicate pages. Tag archives, near-identical location pages and filtered product listings that add little unique value. Consolidate, improve or noindex them.
• Orphan pages. Pages with no internal links are hard for Google to find and signal low importance. Link to them from relevant pages or navigation.
• Slow Largest Contentful Paint. Usually caused by large hero images, render-blocking scripts or slow server response. Compress and correctly size images, defer non-critical scripts and use caching.
• Layout shift. Content that jumps as the page loads, often from images or ads without set dimensions, or late-loading fonts. Reserve space for these elements.

Technical SEO for WordPress sites

WordPress handles many basics well, but a few issues come up again and again. Check that the “Discourage search engines from indexing this site” setting is off on the live site. Use an SEO plugin such as Yoast or Rank Math to control titles, canonicals, sitemaps and which archive types are indexed. Author, tag and date archives are often thin on smaller sites and are usually better noindexed. Keep plugins lean and updated, since every extra plugin can add scripts that slow the page. Use a caching plugin and a good host, and turn off features you do not use, such as XML-RPC and pingbacks, to reduce security risk and spam.

What a good audit report looks like

A useful report is short enough to act on. It should open with a summary of the few issues that matter most, explain each one in plain language with the affected URLs, estimate the impact and the effort to fix, and assign a clear priority. It should also say what is working well, so nothing important is broken by accident. A report that lists hundreds of warnings without prioritising them leaves you to do the hardest part of the job yourself.

After the audit: making sure fixes stick

An audit only pays off once the fixes are live and verified. After each change, re-crawl the affected pages, use the URL Inspection tool in Search Console to request re-indexing of important URLs, and use the “Validate fix” button on the relevant Search Console report so Google rechecks the issue. Keep a simple change log with the date of each fix, so any later movement in rankings or traffic can be traced back to what changed. Most importantly, build checks into your normal process: a quick crawl before and after every site update catches new problems before Google does.

Common questions

Will an audit tell me why my rankings dropped? Often, yes, if the cause is technical — a botched migration, an accidental noindex, a broken canonical. If the drop coincides with a Google core update, the cause is more likely content quality than anything an audit checks.

Do I need an audit before starting SEO, or after? Before. Content and link-building work built on top of an unfixed technical foundation is wasted effort — Google can’t credit content it can’t properly crawl and index.

How long does a technical fix take to show results? Faster than content or authority work — often weeks rather than months, since you’re removing a barrier rather than building new signal. See our guide to what SEO involves for how technical work fits into the bigger picture.

Our SEO services start with exactly this kind of technical crawl and fix list before any content work begins. If you want a second opinion on what your own audit turned up — or want us to run one — get in touch.