You’ve heard it a thousand times. “We follow technical SEO best practices.”
What does that actually mean? And more importantly, how do you know if an agency truly means it, or is just ticking boxes?
Here’s the uncomfortable truth: most technical SEO work doesn’t move the needle on revenue. But done properly, it removes the ceiling that’s stopping your good content from ever ranking in the first place.
The One Thing Everyone Gets Wrong
Agencies love to talk about their “comprehensive audits.” They’ll generate a 47-page PDF with 200 issues. Looks impressive. Feels thorough.
Then you get stuck. Broken links? Sure, that matters. Missing schema? Fine. But which of these actually moves your rankings? And which is just technical debt that costs you time and money but won’t move the dial on your bottom line?
Best practice, properly done, is ruthless prioritisation.
A professional technical SEO audit doesn’t list everything wrong with your site. It lists what’s actively stopping you from ranking, in order of impact. That’s different.
What the Audit Should Actually Cover
When a proper audit happens, it’s narrowly focused:
1. Crawlability & Indexation, Can Google actually find and index your important pages?
This includes the obvious stuff (broken links, orphan pages not linked from anywhere) but also the subtle killers:
- Pages accidentally blocked by robots.txt when they shouldn’t be
- Wasting crawl budget on pages Google doesn’t need to see (duplicate content, parameter bloat, pagination hell)
- Missing XML sitemaps that could speed up discovery
2. Core Web Vitals, the three metrics Google cares about most
- Largest Contentful Paint (LCP): How fast does your hero image/headline load? Aim for ≤2.5 seconds
- Interaction to Next Paint (INP): How long does your site take to respond when someone clicks or types? ≤100 milliseconds is good
- Cumulative Layout Shift (CLS): How much does content jump around whilst the page loads? ≤0.1 is the target
Here’s the thing: a slow site doesn’t just annoy users. Google has explicitly stated these metrics are ranking factors. A site that loads in 5 seconds won’t rank as well as one loading in 2.5 seconds, even with identical content.
3. Site Structure & Internal Linking
This isn’t about aesthetics. It’s about whether your site architecture makes it obvious to Google (and to AI agents, increasingly) what your most important pages are.
- Do you have a clear hierarchy? Can a crawler get from your homepage to any page in 3 clicks?
- Is your linking structure confusing? (Too many internal links dilutes “link juice”; too few means important pages stay buried)
- Are critical pages actually reachable? (Surprising how many aren’t)
4. Technical Metadata
Missing or poorly written title tags and meta descriptions don’t just hurt CTR. They make it harder for Google to understand what your page is about.
A professional audit checks:
- Every title tag (unique? Under 60 characters? Does it actually describe the page?)
- Meta descriptions that actually summarise content, not marketing fluff
- Header tags (H1, H2, etc.) that create proper logical hierarchy
The Cost of “Best Practice”
This is where most UK SMEs get nervous.
A proper technical SEO audit from a professional agency costs £1,500–£5,000 depending on site size and complexity. If someone’s charging £300, they’re cutting corners. If they’re charging £15,000 as a starting point, they’re selling you extra work you don’t need.
Once you have the audit, fixes vary wildly:
- Quick wins (redirects, meta tag updates, robots.txt fixes): Often free if you’re handy with WordPress or can brief a developer
- Medium work (site speed optimisation, internal linking restructure): £2,000–£8,000
- Major infrastructure work (site migration, CMS overhaul, server upgrades): £10,000+
The key question: Does your audit tell you which category each fix falls into? If not, you’re being set up for scope creep.
What Ongoing “Best Practice” Maintenance Actually Involves
Here’s where agencies often oversell.
“Technical SEO maintenance” doesn’t mean paying someone to monitor your site 24/7. It means:
1. Monthly crawl audits, Check for new broken links, indexation issues, or Core Web Vitals degradation (tools: Semrush, Ahrefs, Screaming Frog. Cost: £100–500/month as a service, or free if you’re using a tool anyway)
2. Quarterly deep dives, Review Core Web Vitals trends, check for new crawl inefficiencies, audit internal linking as your site grows
3. Reactive fixes When you add new pages, make sure they’re structured properly. When you redesign, don’t accidentally break redirects or delete pages that rank.
Most UK agencies will sell you 20 hours/month of “technical SEO management.” What you actually need is 4–8 hours per month if your site’s fundamentally sound.
How to Separate Good Agencies from Ones Just Talking
Before you hire anyone, ask them this:
“Show me an example audit for a site in my industry. What was the #1 issue, and what revenue impact did fixing it have?”
If they can’t give you specifics, if they waffle about “improved rankings” or “better crawlability” without connecting it to traffic or leads, they’re selling process, not results.
Good technical SEO agencies will tell you:
- What’s actually preventing your rankings (not a 200-item list)
- Which fixes have the biggest impact (crawl efficiency beats fixing a few meta tags)
- What ongoing work actually costs and why
- That Core Web Vitals matter more now than they used to
- That structured data and semantic HTML matter because AI agents need to understand your site, not just search engines
Bad ones will:
- Give you a massive list of issues
- Quote fix after fix without prioritisation
- Promise that technical SEO alone will transform your traffic (it won’t, but it’s a prerequisite for anything else)
- Ignore ongoing maintenance costs
The Real Question
Technical SEO best practices aren’t complicated. They’re just rarely done in sequence.
Fix crawlability first. Then Core Web Vitals. Then structure and metadata. Each layer builds on the last. Skip one, and the others lose impact.
Most agencies jump straight to the visible stuff (adding schema, tweaking titles) without checking if the foundation is sound. It’s like buying new tyres before fixing the steering.
What You Should Do Next
Step 1: Get a proper audit. Budget £2,000–£3,500. Any less, and corners are being cut. Any more without a clear scope, and you’re being overcharged.
Step 2: Ask for a prioritised list. Not a 200-item roadmap. A “do these three things first” list with estimated impact.
Step 3: If it involves major work (site speed, infrastructure), get a second opinion. Technical SEO is measurable. If the numbers don’t add up, challenge them.
Step 4: After fixes, measure. Core Web Vitals should improve within 4 weeks. Indexation should improve within 8. If neither is happening, something’s wrong.
Most importantly: Technical SEO is not optional. But it’s also not unlimited. A site that’s properly optimised will rank better. A site that’s obsessively optimised past the point of diminishing returns is just expensive.
Ready to know if your site’s actually broken, or just needs the right fixes?
We offer a free technical audit for UK businesses, no sales pitch, just a prioritised list of what’s costing you rankings. It takes 30 minutes and you’ll know whether you need someone’s help or you’ve just been listening to agency fluff.