What Is Included in Technical SEO? Every Piece, Explained Plainly

The short version: Technical SEO covers everything that lets search engines crawl, render, and index your site, plus everything that makes it fast and stable enough for people to use it. That means crawlability, indexation, site speed, mobile setup, structured data, security, site architecture, and international or duplicate content handling. If any one of these is broken, your content, however brilliant, sits invisible or ignored.

Why this list exists at all

I get asked this a lot, usually by a business owner who's just been quoted £3,000 for "a technical SEO audit" and has no idea what they're paying for. Fair question. Technical SEO isn't one thing. It's a bundle of separate jobs that all sit under the same label because they all affect the same outcome: whether Google can find, understand, and trust your pages. I've written before about what technical SEO is in digital marketing terms, but this post is the checklist version. What's inside the box.

Crawlability: can Google even get in the door

This is the foundation, and it's the bit that gets skipped most because it's boring and invisible until it goes wrong.

• Robots.txt - the file telling crawlers where they can and can't go. I've seen a client accidentally block their entire blog folder with one wrong line in this file. Six months of content, invisible to Google, because of one typo.
• XML sitemap - the map you hand to Google so it doesn't have to guess your site structure. Should only include pages you want indexed, not every tag and category archive WordPress spits out by default.
• Crawl budget - relevant mostly for big sites (10,000+ pages). Google allocates a rough number of pages it'll crawl per visit. Waste that budget on thin, duplicate, or parameter-stuffed URLs and your good pages get crawled less often.
• Internal linking - orphan pages (pages with zero internal links pointing to them) are practically invisible to crawlers, no matter how good the content is.

If you're thinking of hiring help, read how I approach the job as an SEO consultant for UK businesses. For real numbers rather than theory, see the case study of my own site's SEO and AI visibility.

Indexation: is Google keeping what it finds

Crawling and indexing are not the same thing, and this is where a lot of confusion sits. Google can crawl a page and still decide not to index it.

• Canonical tags - tell Google which version of a duplicate or near-duplicate page is the "real" one. Get this wrong on an ecommerce site with size and colour variants and you can accidentally tell Google there are 400 duplicate pages competing with each other.
• Noindex tags - deliberately keeping thin or private pages (thank-you pages, internal search results, filtered category pages) out of the index.
• Index coverage reports - inside Google Search Console, this shows you exactly what's indexed, what's excluded, and why. If you've never opened this tab, that's your first job after reading this.

Site speed and Core Web Vitals

Google has measured page experience directly since 2021, using three metrics: Largest Contentful Paint (how fast the main content loads), Interaction to Next Paint (how quickly the page responds when someone clicks or taps), and Cumulative Layout Shift (whether things jump around while loading, the thing that makes you misclick a button because an ad just loaded above it).

I once worked with a small events company whose homepage took 6.8 seconds to load on mobile. We compressed images, removed three unused plugins, and switched to a lighter theme. Load time dropped to 2.1 seconds. Bounce rate on that page fell by 34% within a month. Nothing about the content changed. Only the speed.

Mobile setup

Google has used mobile-first indexing since 2019, meaning it primarily looks at your mobile site to decide rankings, not your desktop one. If your mobile menu is broken, your text overlaps, or your tap targets are too close together, that's not a design complaint anymore, it's an SEO problem.

Structured data (schema markup)

This is code added to your pages that explains to search engines what your content is, a recipe, a review, an FAQ, a product with a price. It doesn't directly boost rankings, but it earns you rich results: star ratings, price snippets, FAQ dropdowns in search results. Those take up more visual space and pull more clicks even when your ranking position hasn't moved.

HTTPS and site security

A basic one but still missed: your site needs a valid SSL certificate. No padlock, no HTTPS, and Chrome flags you as "not secure" right in the address bar. That's a trust signal Google has used as a ranking factor since 2014, and it's a trust signal a nervous buyer notices before they've read a word of your copy.

URL structure and site architecture

Flat, logical URLs beat deep, messy ones. Compare yoursite.com/services/technical-seo to yoursite.com/p?id=4471&cat=8. The first tells a human and a crawler exactly what the page is about before they've even clicked. Good architecture also means no page sits more than three or four clicks from the homepage. Bury your best content six folders deep and both users and crawlers give up before they find it.

Duplicate content and international targeting

If you sell into the UK, US, and Israel like I do, hreflang tags matter. They tell Google which version of a page to show which audience, so your UK visitors get GBP pricing and your US visitors don't land on a page written in British spelling with a currency they don't recognise. Get hreflang wrong and Google might show the wrong country version to the wrong searcher, which quietly kills conversion rate even when traffic looks fine.

Log file analysis (the bit almost nobody mentions)

This is the uncomfortable part most technical SEO checklists conveniently leave off, because it's tedious. Server log files show you exactly what Googlebot did on your site, which pages it visited, how often, and what it ignored entirely. I've pulled log files for a client with 40,000 product pages and found Googlebot hadn't touched 60% of them in over four months. No amount of sitemap submission fixed that. The real problem was crawl budget being burned on faceted navigation URLs, filter combinations like colour plus size plus price range, each one technically a unique URL, none of them worth indexing. We blocked them in robots.txt and within six weeks crawl frequency on the actual product pages tripled. Most agencies skip log file analysis because it requires server access and genuine patience, and most audits you're sold simply won't include it, even though it's often the single most revealing piece of the whole puzzle.

What a proper technical SEO audit should check

If you're paying someone for this work, here's the checklist they should be running, step by step, not skimming:

• Crawl the site with a tool like Screaming Frog to find broken links, redirect chains, and duplicate title tags
• Check Google Search Console's index coverage and Core Web Vitals reports
• Test mobile usability on at least three real devices, not just a browser resize
• Verify the sitemap matches what's indexable
• Check canonical tags against actual page content
• Run a page speed test on your five highest-traffic pages, not just the homepage
• Pull log files if the site has more than a few thousand pages
• Check hreflang implementation if you serve more than one country or language

Where technical SEO stops and other SEO starts

Technical SEO doesn't cover content quality, keyword research, or backlink building. Those are content SEO and off-page SEO, different disciplines entirely, and confusing the three is how business owners end up paying for the wrong fix. If your rankings are stuck and your site is technically clean, the problem is almost always thin content or a lack of authority signals, not a robots.txt line. I've watched clients spend £2,000 on a "technical audit" when their real issue was that they had 400 words on a page that needed 1,500 and genuine expertise behind it.

This is also where AI tools have quietly changed the job for the better. Site audits that used to take three days of manual checking now get flagged in minutes by AI-assisted crawlers, freeing up the time to fix things rather than just find them. If you're running a small business and want to understand where AI helps day to day rather than just being a buzzword, I've written honestly about how I use AI every day without being technical myself, and the same logic applies to SEO tooling.

Who needs to worry about this

If you run a five-page brochure site with clean, simple structure, you probably need a light technical check once a year, not a monthly retainer. If you run an ecommerce store with thousands of SKUs, or a content site publishing daily, technical SEO needs ongoing attention because new pages mean new chances for duplicate content, broken canonicals, and crawl waste. The size and complexity of your site should decide the size of the technical SEO budget, not a generic package a freelancer is trying to upsell you into.

I have written more around this on the site: What Is Technical SEO in Digital Marketing? A Straight Answer From Someone Who's Fixed the Broken Bits, I'm Not Technical. I Use AI Every Day. Here's How I Do It., Does Email Marketing Cost Money to Run? Here's the Actual Breakdown.

The website mapping tool on this site shows a whole site structure from one URL, which makes this audit much faster.

Related: What Is Technical SEO? The Key Elements Explained (With a Real Migrati.

Related: writing for us on hr tech.

Related: writing for us on technical writing.

Frequently asked questions

Is technical SEO a one-time fix or ongoing work?

For most sites it's ongoing, because every new page, plugin update, or site redesign can quietly reintroduce crawl errors, broken canonicals, or speed regressions, so a quarterly check is a sensible minimum for anything beyond a small brochure site.

How much does a technical SEO audit typically cost?

Freelancers in the UK generally charge between £500 and £2,000 for a one-off audit depending on site size, while agencies often price it at £1,500 to £5,000, with ongoing monthly technical SEO support typically running £500 to £2,000 a month for mid-sized sites.

Can I do technical SEO myself without hiring anyone?

Yes for a small site: Google Search Console, a free Screaming Frog crawl of up to 500 URLs, and a page speed test will catch most issues, but sites over a few thousand pages usually need someone who can read log files and handle canonical and hreflang setup.

What's the single biggest technical SEO mistake small businesses make?

Blocking or noindexing content by accident, usually through a robots.txt error or a plugin default setting, which silently removes pages from Google's index for months before anyone notices the traffic drop.

When you're ready to pitch, I keep a list of SEO sites that welcome contributors.

Further reading

• Google Search Central documentation
• Google's spam policies