If your website isn't bringing in the traffic or enquiries it should, an SEO audit is the best place to start. It's like an MOT for your website: a thorough check that shows exactly what's working, what's broken and what to fix first.
In this guide I'll explain what an SEO audit is, what a proper one covers, how much it costs in the UK and what happens next. If you'd like one done for you, see our SEO audit service. We also offer a free audit to get you started.
What Is an SEO Audit?
An SEO audit is a detailed review of your website to find the issues stopping it from ranking higher on Google. It looks at your site's technical health, content, on-page optimisation, backlinks and local presence, and compares you against your competitors.
The output should be a prioritised action plan, not just a long list of problems. A good audit tells you which fixes will make the biggest difference, so you can focus your time and budget where it counts.
Why it matters: without an audit, SEO is guesswork. You could spend months writing content while a technical issue stops Google indexing half your site.
What Does a Proper SEO Audit Cover?
Technical SEO
A technical SEO audit checks whether search engines can crawl, render and index your website properly. It covers:
- Indexing issues and pages blocked from Google
- Site speed and Core Web Vitals
- Mobile usability
- Broken links, redirect chains and 404 errors
- Duplicate content and canonical tags
- XML sitemap and robots.txt setup
- HTTPS and security
- Structured data (schema markup)
- JavaScript rendering, a common problem on modern and AI-built sites
On-page SEO
This reviews each important page for page titles and meta descriptions, heading structure, keyword targeting, internal linking and image optimisation. It also flags pages competing against each other for the same keyword, known as keyword cannibalisation.
Content
Is your content detailed, helpful and aligned with what people actually search for? A content audit identifies thin pages, missing service or location pages, and content gaps your competitors are filling.
Backlinks and authority
We review who links to your site, the quality of those links, and any toxic links that could be holding you back. We also compare your authority against competitors.
Local SEO
For local businesses, the audit covers your Google Business Profile, reviews, local citations and consistency of your name, address and phone number across the web.
Competitor analysis
Understanding why competitors outrank you is often the most revealing part of an audit. It shows exactly what you need to match or beat.
Free SEO Tools vs a Professional SEO Audit
There are plenty of free SEO checkers online, and they can be useful for spotting obvious issues. But they have real limitations.
| Free SEO checker | Professional SEO audit | |
|---|---|---|
| Speed | Instant | A few days |
| Depth | Surface-level checks | In-depth, manual review |
| Context | Generic warnings | Specific to your business and market |
| Prioritisation | Everything flagged equally | Ranked by impact |
| Competitor insight | Minimal | Detailed |
| Action plan | No | Yes |
Free tools often flag dozens of "errors" that don't matter, while missing the strategic issues that do. A professional audit brings human judgement to what the data means.
How Much Does an SEO Audit Cost in the UK?
SEO audit prices vary depending on the size of your website and the depth of the review. As a broad guide:
- Small business website (under 50 pages): £300–£800
- Medium website or multi-location business: £800–£1,500
- Large or ecommerce website: £1,500–£2,500+
Some agencies, including SERPentity, offer a free initial audit. It highlights your key issues and opportunities, so you can see the value before committing to anything. For more on pricing generally, read our SEO cost guide.
How Often Should You Audit Your Website?
I recommend a full SEO audit:
- Before starting any new SEO campaign
- Before and after a website redesign or migration, when rankings are most at risk
- After a sudden drop in traffic or rankings
- At least once a year as a routine health check
Ongoing SEO campaigns should also include regular monitoring, so issues are caught as they happen.
What Happens After an SEO Audit?
An audit is only valuable if you act on it. Once you have your results, you have three options:
- Fix it yourself. If you're comfortable with your website, you can work through the action plan in priority order.
- Hand it to your developer. Technical fixes can often be passed straight to your web developer.
- Let an agency implement it. An agency like ours can take the plan and do the work, from technical fixes to content and link building. See our SEO services.
Whichever you choose, start with the high-impact, low-effort fixes. They often deliver quick wins while bigger improvements take shape.
Signs You Need an SEO Audit
- Traffic has dropped and you don't know why
- You've recently redesigned or moved your website
- Competitors outrank you despite offering similar services
- Some of your pages don't appear on Google at all
- Your site feels slow, especially on mobile
- You're about to invest in SEO and want to know where to start
How to Get a Free SEO Audit From SERPentity
We offer a free, no-obligation audit of your website, SEO and ads. We'll review your site, identify the biggest issues holding you back, and show you the opportunities you're missing, in plain English, with no jargon.
Many of our client relationships start this way. Adapt Planning, for example, saw major gains in traffic and rankings within weeks once the issues were fixed. Request your free audit and we'll be in touch.
Common Issues an SEO Audit Uncovers
After auditing many small business websites, I see the same problems again and again:
- Important pages not indexed. Pages accidentally blocked from Google, or missing from the sitemap.
- Missing or duplicate page titles. Several pages sharing the same title, confusing Google about which to rank.
- Slow mobile load times. Usually caused by oversized images, heavy themes or too many plugins.
- Thin service pages. One short page trying to rank for every service.
- Broken internal links left behind after pages were moved or deleted.
- No schema markup, missing out on rich results in search.
- Inconsistent business details across directories and Google Business Profile.
- Redirects lost during a redesign, causing a sudden drop in traffic.
Most of these are straightforward to fix once identified. The audit's real value is finding them, then telling you which to fix first.
DIY Checks You Can Do Today
You don't need specialist tools to spot some warning signs yourself. Search Google for site:yourdomain.co.uk to see roughly how many of your pages are indexed. If key pages are missing, there's a problem. Open your website on your phone and check how quickly it loads and how easy it is to use. Search for your main services plus your town and see where you appear. Finally, look at your Google Business Profile and check your details are accurate and complete.
If any of these checks raise concerns, a full audit will uncover the cause and show you how to fix it. It's the difference between knowing something is wrong and knowing exactly what to do about it. Our guide to SEO services explains what comes next.
Final Thoughts
An SEO audit gives you clarity. Instead of guessing why your website isn't performing, you'll know exactly what's wrong and what to do about it. It's the smartest first step for any business serious about ranking on Google.
Ready to see what's holding your website back? Get your free SEO audit today.
