Technical SEO: The Complete Guide to a Perfectly Optimised Website

What Is Technical SEO?

Technical SEO refers to the process of optimising the infrastructure of your website so that search engines can crawl, index and render it effectively. Unlike content SEO, technical SEO focuses on the backend β€” server configuration, site architecture, page speed, structured data and more.

You can have the best content in your industry, but if Google can’t crawl or index your pages, that content will never rank.

Why Technical SEO Matters

Technical SEO is the foundation. Content and links amplify a technically sound site. They do very little for a broken one. Technical issues like slow load times, broken internal links, duplicate content and crawl errors can suppress your rankings regardless of your content quality or link profile.

The Technical SEO Checklist

1. Crawlability

Google’s bots must be able to reach and crawl every important page on your site. Key checks:

  • robots.txt is not blocking important pages or resources
  • Internal links reach all important pages
  • No orphan pages (pages with no internal links pointing to them)
  • XML sitemap is present, up to date and submitted to Google Search Console
  • Crawl budget is being used efficiently (no wasted crawls on paginated, filtered or duplicate URLs)

2. Indexation

Crawlable doesn’t mean indexed. Check that:

  • Important pages are not set to noindex
  • Canonical tags are correctly implemented
  • Hreflang tags are correct for international sites
  • Google Search Console shows no indexation issues

3. Site Speed and Core Web Vitals

Page speed is a confirmed ranking factor. Google’s Core Web Vitals are the specific metrics Google uses:

  • LCP (Largest Contentful Paint): How long until the largest element loads. Target: under 2.5 seconds.
  • FID/INP (Interaction to Next Paint): How quickly the page responds to user interaction. Target: under 200ms.
  • CLS (Cumulative Layout Shift): How much the layout shifts during loading. Target: under 0.1.

Measure with PageSpeed Insights, Chrome UX Report and Search Console’s Core Web Vitals report.

4. HTTPS and Security

HTTPS is a confirmed ranking factor. All pages must be served over HTTPS with a valid certificate. Check for mixed content warnings and ensure HTTP redirects to HTTPS.

5. Duplicate Content

Duplicate content dilutes ranking signals. Causes include: www vs non-www, HTTP vs HTTPS, trailing slash vs non-trailing slash, paginated pages and URL parameters. Fix with canonical tags and consistent internal linking.

6. Structured Data (Schema Markup)

Schema markup helps Google understand your content and can unlock rich results (review stars, FAQs, product details). Implement:

  • Organization schema on your homepage
  • LocalBusiness schema for location pages
  • Service schema on service pages
  • Article schema on blog posts
  • FAQPage schema on pages with FAQs

7. Mobile Optimisation

Google uses mobile-first indexing β€” it primarily uses the mobile version of your site for ranking. Your site must be fully responsive, with the same content on mobile as desktop and no mobile-only interstitials.

How to Run a Technical SEO Audit

  1. Crawl your site with Screaming Frog or Sitebulb
  2. Check Google Search Console for errors, warnings and coverage issues
  3. Run PageSpeed Insights on your key pages
  4. Test structured data with Google’s Rich Results Test
  5. Review your Core Web Vitals in Search Console
  6. Check mobile usability in Search Console