Technical SEO checklist for UK websites

By Netbeam · Updated 2026-10-22

This technical SEO checklist covers the checks every UK website should pass. Technical problems can quietly hold back good content, so fixing them first often gives the fastest gains. Work through each section, note what fails and fix the highest-impact items first. You do not need to be a developer to run most of these checks, though you may need one to fix some of them.

Technical SEO checklist: crawling and indexing

• Make sure important pages are indexable and not set to noindex by mistake.
• Check robots.txt is not blocking key sections or helpful crawlers.
• Submit an XML sitemap in Google Search Console.
• Fix redirect chains and broken internal links.
• Check the Pages report in Search Console for pages that are excluded and ask why.
• Make sure staging or test sites are not indexed.

If a page is not indexed, it cannot rank. Start here before spending on content or links.

Site structure and URLs

• Use short, readable URLs.
• Keep important pages within a few clicks of the homepage.
• Use clear internal links with descriptive anchor text.
• Add a canonical tag to every page to avoid duplicates.
• Choose one version of the site (https, with or without www) and redirect the others.

A clear structure helps visitors and crawlers. Group related pages under sensible sections and link between them naturally.

Page speed and Core Web Vitals

Compress images, use modern formats, limit heavy scripts and use caching. Check your Core Web Vitals in Search Console and fix the slowest templates first. Speed helps visitors as much as search engines, and slow pages lose enquiries before anyone reads your content. Test on a mid-range phone and a slow connection, not only on a fast office computer.

Mobile friendliness

Most UK searches happen on phones. Test your key pages on mobile, check buttons are easy to tap, make sure text is readable without zooming and check that menus, forms and pop-ups work properly. Make sure the mobile version contains the same important content as the desktop version.

Structured data

Add schema markup for your organisation, services, FAQs, articles and breadcrumbs where it matches the visible content. Test it with Google’s Rich Results Test and fix any errors. Do not mark up content that is not on the page, as that can lead to penalties or ignored markup.

Security and quality

• Use HTTPS on every page.
• Keep the CMS, theme and plugins updated.
• Fix soft 404 errors and thin duplicate pages.
• Add alt text to meaningful images.
• Check for hacked or spammy pages in Search Console.

Metadata checks

Give every page a unique title and meta description, with the main keyword used naturally. Titles should usually stay near 60 characters and descriptions near 155. Check for missing, duplicate and truncated titles with a crawl tool or your SEO plugin. Use one H1 per page that matches the topic.

Internationalisation and UK specifics

If you serve only the UK, set your language to British English, use UK spelling and pounds sterling, and make sure address and phone details are in UK format. If you also serve other countries, use hreflang tags correctly and avoid duplicate pages for each region without real differences.

How to prioritise fixes

Fix what blocks crawling and indexing first, then problems that affect many pages, such as slow templates, then page-level issues. Record each fix with a date so you can see how changes line up with results.

What to do next

Run the list, fix the highest-impact items first and recheck monthly. Our technical SEO service does this for you, and a free SEO audit is a good starting point. Google’s own advice is in Google’s SEO Starter Guide.

Free tools you can use to run this checklist

• Google Search Console: indexing, sitemaps, Core Web Vitals and manual actions.
• PageSpeed Insights: speed and Core Web Vitals for individual pages.
• Rich Results Test: structured data checks.
• A crawler such as Screaming Frog (free up to a limit): broken links, redirects, titles and canonicals.
• Your browser’s developer tools: quick checks of status codes and mobile layout.

None of these tools replaces judgement. They point to problems, and you decide which matter most for your business.

A worked example: a UK ecommerce site

An online shop finds that hundreds of filtered category URLs are being indexed, product pages load slowly because of large images and the sitemap includes pages that redirect. Fixes include adding canonical tags to filtered pages, compressing and resizing images, removing redirected URLs from the sitemap and adding product schema with accurate prices and availability.

After the changes, Search Console shows fewer excluded and duplicate pages, speed scores improve and important category pages are crawled more often. The content did not change, but the site became easier to read for search engines and faster for shoppers.

Common technical SEO mistakes

• Leaving noindex on after a site launch.
• Blocking the whole site in robots.txt on a staging copy that goes live.
• Changing URLs without redirects.
• Using several H1 tags or none at all.
• Ignoring mobile layout problems.
• Adding schema that does not match the page.

Frequently asked questions

What is technical SEO?

Technical SEO is the work of making sure search engines can crawl, index and understand your site, and that it loads quickly and works on every device.

How often should I run a technical SEO check?

A full check every quarter works for most sites, with monthly checks on indexing and speed.

Can I do technical SEO myself?

You can run many checks yourself using Search Console and free tools, but some fixes need a developer.

What are Core Web Vitals?

They are Google’s measures of loading speed, interactivity and visual stability. Poor scores can hurt user experience and may affect search performance.

Does schema markup improve rankings?

Schema does not guarantee rankings, but it helps search engines understand your content and can make results more informative.

What should I fix first?

Fix anything that stops pages being crawled or indexed, then problems that affect many pages, such as speed or duplicate content.

Want help applying this? Request a free SEO audit, see our SEO services or check SEO pricing.