Technical SEO Audit Checklist: The 15 Checks That Actually Affect Rankings

A technical SEO audit that produces a 200-page report nobody reads is not an audit — it is a document. The value of an audit is in the findings that get fixed, which means the audit must be prioritised, actionable, and scoped to the checks that actually affect rankings.

The 15 checks that matter

Crawlability and indexation (1-5)

1. Crawl errors. Google Search Console reports pages Google cannot crawl. Fix 404s, server errors, and redirect loops. These prevent indexing.
2. Indexation status. Check how many pages are indexed vs. submitted. A large gap means Google is not indexing pages — investigate why.
3. Robots.txt review. Ensure important pages are not blocked. Check that resources (CSS, JS) are not blocked, or Google cannot render the page.
4. XML sitemap. Submit a clean sitemap with only canonical, indexable URLs. Remove redirects, 404s, and non-canonical pages from the sitemap.
5. Canonical tags. Every page should have a self-referencing canonical tag. Check for incorrect canonicals that point to the wrong page.

Site architecture (6-8)

6. Internal linking. Important pages should be linked from multiple pages. Orphan pages (no internal links) are unlikely to be crawled or ranked.
7. URL structure. URLs should be descriptive, short, and use hyphens. Avoid parameters, session IDs, and dynamic URLs where possible.
8. Site depth. Important pages should be reachable within 3-4 clicks from the homepage. Deep pages are crawled less frequently and ranked lower.

Performance and usability (9-12)

9. Core Web Vitals. LCP, INP, and CLS must meet Google's thresholds. These are ranking factors and user experience metrics.
10. Mobile usability. The site must be responsive and usable on mobile. Google uses mobile-first indexing — the mobile version is the primary version.
11. Page speed. Compress images, minify CSS and JavaScript, use a CDN, and enable caching. Page speed affects both rankings and user experience.
12. HTTPS. The site must use HTTPS. Google uses it as a ranking signal, and browsers warn users on HTTP sites.

Content and structured data (13-15)

13. Meta tags. Every page needs a unique title tag and meta description. Title tags should be under 60 characters; meta descriptions under 160 characters.
14. Structured data. Implement JSON-LD schema for Organisation, Article, FAQPage, and BreadcrumbList. This enables rich results in search.
15. Duplicate content. Check for duplicate content across the site. Use canonical tags to tell Google which version is the original.

The prioritisation that makes findings actionable

Not all findings are equal. Prioritise by: impact on rankings (crawl errors and indexation first), effort to fix (quick wins before complex changes), and business value (pages that generate revenue or traffic first). An audit that lists 200 findings with no prioritisation is noise. An audit that lists the top 10 findings in priority order gets fixed.

An audit that produces fixes, not just findings

A technical SEO audit is only valuable if the findings get fixed. We audit with prioritisation, producing a ranked list of issues and the effort to fix each — so the work gets done.

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Frequently Asked Questions

What is a technical SEO audit?

A systematic examination of a website's technical infrastructure to identify issues that prevent search engines from crawling, indexing, and ranking the site effectively. It covers crawlability, indexation, site architecture, performance, mobile usability, and structured data.

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Sources and standards referenced

1. Google Search Central — SEO Guide
2. Google Search Console
3. Screaming Frog — SEO Spider
4. web.dev — Core Web Vitals
5. Google — Mobile-First Indexing