Technical SEO Checklist: October 2025 for UK Websites
Technical SEO is the foundation of high rankings. Use this checklist to make sure your site is fast, crawlable, and optimised for Google’s latest requirements in October 2025.
1. Crawlability & Indexation
- Check robots.txt and XML sitemap for errors
- Use Google Search Console to monitor index coverage
- Fix broken links and redirect chains
Tool Tip: Use Screaming Frog or Sitebulb to crawl your site and spot indexation issues. Set up automated alerts in Search Console for new errors.
Pro Tip: Regularly audit your redirects and internal links to avoid orphaned pages and wasted crawl budget.
2. Site Speed & Core Web Vitals
- Optimise images and use next-gen formats (WebP, AVIF)
- Minimise JavaScript and CSS
- Use a CDN and enable caching
- Monitor LCP, FID, and CLS in Search Console
Stat: Sites that pass Core Web Vitals see up to 20% higher rankings and lower bounce rates.
Tool Tip: Test your site with Google PageSpeed Insights and WebPageTest. Use tools like ImageOptim or Squoosh for image compression.
3. Mobile Optimisation
- Ensure responsive design and fast mobile load times
- Test with Google’s Mobile-Friendly Test
- Optimise tap targets and font sizes
Case Study: A Liverpool retailer improved mobile UX and saw a 30% increase in organic traffic after fixing tap targets and speeding up mobile load times.
4. Structured Data & Schema
- Add schema for articles, products, reviews, and FAQs
- Test with Google’s Rich Results tool
- Fix any warnings or errors
Tool Tip: Use Schema.org and Google’s Structured Data Testing Tool to validate your markup.
Pro Tip: Adding FAQ schema can boost your visibility in search results and drive more clicks.
5. HTTPS & Security
- Use HTTPS everywhere
- Renew SSL certificates and check for mixed content
- Enable HSTS and security headers
Tool Tip: Use SSL Labs to test your SSL setup. Set up auto-renewal for certificates to avoid downtime.
6. Accessibility
- Use semantic HTML and ARIA labels
- Ensure good colour contrast and keyboard navigation
- Add alt text to all images
Stat: Accessible sites reach a wider audience and are favoured by Google’s algorithms.
Tool Tip: Test with WAVE Accessibility Tool and axe DevTools.
7. Log File Analysis
- Review server logs for crawl errors and bot activity
- Identify and fix crawl budget issues
Pro Tip: Use Screaming Frog Log File Analyser or Google’s Search Console crawl stats to spot wasted crawl budget and improve indexation.
October 2025 Action Plan
- Run a full technical SEO audit using Screaming Frog or Sitebulb
- Fix any Core Web Vitals issues flagged in Search Console
- Add or update structured data for all key pages
- Review mobile usability and accessibility with Google’s tools
Frequently Asked Questions
Q: What is technical SEO?
A: It’s the process of optimising your website’s infrastructure to help search engines crawl, index, and rank your site.
Q: How often should I run a technical SEO audit?
A: At least quarterly, or after major site changes.
Q: What are Core Web Vitals?
A: Google’s metrics for site speed, responsiveness, and visual stability.
Q: Why is structured data important?
A: It helps search engines understand your content and can enhance search results with rich snippets.
Q: How do I fix crawl errors?
A: Use Google Search Console to identify and resolve issues with indexing and crawling.
Key Takeaways for October 2025
- Audit crawlability and indexation monthly
- Optimise site speed and pass Core Web Vitals
- Ensure mobile usability and accessibility
- Add and validate structured data for rich results
- Secure your site with HTTPS and proper headers
Focus on these steps to keep your UK website competitive and ranking high in Google throughout October 2025.
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