How to Perform a Technical SEO Audit
A technical SEO audit is a structured review of a website's crawlability, indexability, rendering, performance, and architecture to find issues that can limit organic search visibility.
Start here
- Start with a crawl + Search Console — never just one.
- Fix crawlability and indexability before anything else.
- Use severity labels (critical, high, medium, low) to prioritize fixes.
- Re-audit after any major site change.
- Don't ignore rendering if your site uses JavaScript heavily.
What I'd do first
- Crawl the site with a tool like Sitebulb or Screaming Frog. This gives you a raw map of URLs, status codes, meta tags, and internal links.
- Pull Google Search Console data — Coverage report, sitemap status, and manual actions. The crawl shows what's reachable; Search Console shows what's indexed.
- Check robots.txt and sitemaps — Are important pages blocked? Are sitemaps submitted and error-free?
- Scan for noindex, canonical, and redirect conflicts — These are the most common reasons pages don't rank.
- Run a Core Web Vitals report in Search Console or PageSpeed Insights. Don't optimize yet — just note the worst offenders.
Plain-English take
Think of a technical SEO audit like a home inspection before buying a house. You're not redecorating yet — you're checking if the foundation is cracked, the plumbing works, and the doors actually open. The crawl is your flashlight. Search Console is the blueprints. Together, they show you what Google can and can't see on your site. Fix the structural stuff first (blocked pages, broken links, duplicate content) before you worry about paint colors (page speed, schema).
When it actually matters
- After a site migration — new domain, new platform, or new URL structure. You need to confirm nothing broke.
- Before a major content push — if you're launching a new section or campaign, make sure those pages can be crawled and indexed.
- When traffic drops unexpectedly — a technical issue (like a rogue noindex tag or a server error) could be the culprit.
- Quarterly, as maintenance — even if nothing changed, Google updates its algorithms and your site accumulates cruft.
What I got wrong
- Running a crawl without checking Search Console first. I once spent hours fixing 404s that Google had already excluded from the index. The real issue was a misconfigured sitemap.
- Prioritizing page speed over crawlability. I optimized images and deferred JS, but the homepage had a noindex tag. Nobody saw the speed improvements because the page wasn't indexed.
- Delivering a laundry list of issues without severity. I handed over 200 findings. The client froze. Now I always group by impact: critical (blocking indexation), high (affecting ranking signals), medium (performance), low (nice-to-haves).
Next step
Quick answers
What is a technical SEO audit?
A technical SEO audit is a structured review of a website's crawlability, indexability, rendering, performance, and architecture to find issues that can limit organic search visibility.
How often should you perform a technical SEO audit?
At least quarterly, or after major site changes like redesigns, migrations, or platform updates.
What tools do you need for a technical SEO audit?
A crawler (like Sitebulb or Screaming Frog), Google Search Console, and optionally a page speed tool (Lighthouse, PageSpeed Insights) and a structured data validator.
Sources
Primary documentation is linked directly. Anything commercial is marked nofollow.
- Google Search Central — Primary source for crawling, indexing, sitemaps, robots directives, structured data, and site performance guidance.
- Google Search Console Help — Best source for reports used in audits such as coverage, sitemaps, crawl stats, and Core Web Vitals.
- Moz SEO Audit Checklist — Widely used audit framework with practical pass/fail workflow and prioritization structure.
- Sitebulb Technical SEO Audit Guide — Clear checklist-style guidance on technical audit sections and reporting.
- Semrush Technical SEO Audit Guide — Concise step-by-step workflow that pairs crawling with Search Console analysis.
Notes from Callum Bennett.