What is technical SEO?

Technical SEO is the work of making sure search engines can crawl, understand and index your website: fast loading, mobile-friendly pages, HTTPS, working links, sensible redirects and a clear structure. It won't make thin content rank, but a technical fault can stop good content being found at all, which is why it comes before everything else on the list.

Why is technical SEO important?

Google can only rank pages it can reach and process. If a page is blocked from crawling, marked noindex by mistake, buried behind broken links or so slow that visitors leave, the quality of the writing never gets a chance to count. Technical problems are also the cheapest category to fix: they are usually one-off jobs, not ongoing effort. The catch is that they only remove obstacles. Once your site is technically sound, rankings still depend on content and links, which is the work covered under content and link building.

What does technical SEO include?

The list looks long, but each item answers a simple question about your site. Here are the ones that matter most, and where to check each.

Area	The question it answers	Where to check
Crawling	Can Google reach your pages? (robots.txt, internal links)	Search Console, /robots.txt
Indexing	Are the right pages in Google, and the wrong ones kept out?	Search Console "Pages" report
Sitemap	Does Google have a clean list of your pages?	Search Console "Sitemaps"
Speed and Core Web Vitals	Do pages load quickly and stay stable? (targets: LCP under 2.5s, INP under 200ms, CLS under 0.1)	PageSpeed Insights
Mobile usability	Does the site work properly on a phone?	Your own phone, PageSpeed Insights
HTTPS and redirects	Is the site secure, with one version of each URL?	Browser, a crawler such as Screaming Frog
Duplicate content and canonicals	Is the same page reachable at several URLs?	Search Console, a crawler
Structured data	Can Google read details like your business info and reviews?	Google's Rich Results Test

What is a technical SEO audit?

A technical SEO audit is a systematic check of the table above, usually run with a crawler that visits every page the way Google does and flags broken links, redirect chains, missing titles, duplicate pages and slow templates. The output should be a prioritised list, not a 90-page PDF: what is wrong, how much it matters, and who fixes it. That is the technical half of a fixed-price SEO audit.

How do you check your own site's technical SEO for free?

Start with Google Search Console, which is free and shows what Google itself sees. Check the Pages report for pages that are not indexed and the reasons given, then the Sitemaps report to confirm your sitemap was read. Run your key pages through PageSpeed Insights, open yourdomain.co.uk/robots.txt to make sure nothing important is blocked, and search site:yourdomain.co.uk to see roughly what Google has indexed. Ten minutes of this finds the most common faults.

What is the difference between technical SEO and on-page SEO?

Technical SEO is about the site as a whole: whether it can be crawled, loaded and understood. On-page SEO is about each individual page: the title, headings, wording and internal links that tell Google what the page is for. Off-page SEO covers signals from elsewhere, mainly links from other sites. The three overlap, but they fail in different ways. A technical fault is usually sitewide and invisible to visitors, while an on-page weakness shows up as a page that is easy to find and unconvincing to read. A proper audit looks at all three, in that order.

What technical SEO does a small business actually need?

Less than most agency pitches suggest. A small, modern site on decent hosting is usually technically fine, and the problems that do appear are repetitive: pages accidentally set to noindex after a redesign, a staging site left blocking Google, old URLs without redirects, oversized images slowing every page, and duplicate versions of the homepage at http, https and www. Fix those first. Chasing a perfect Core Web Vitals score is rarely the bottleneck, since Google treats page experience as one signal among many and a fast page with weak content still won't rank.

Do you need to pay for technical SEO services?

Usually once, not monthly. A technical audit followed by a round of fixes covers the large majority of what a small site needs, and the work only recurs when the site changes substantially, such as a redesign, a platform move or a big content expansion. Be cautious of a monthly fee that is mostly "technical monitoring" with little visible output: our guide to what an SEO retainer should include explains what to ask for. Once the foundations are sound, the better use of budget is the content structure described in what topic clusters are, and how long SEO takes to show results.