A proper audit answers three questions, not one. Here is what technical, content and authority reviews each cover and what the output should look like.
An SEO audit is a structured review of why a site does or does not rank, across three areas: technical health, content quality and authority. A technical audit on its own only answers a third of the question. If your pages crawl perfectly but nobody links to you and the copy targets the wrong query, the crawl report will look excellent and the traffic will not move.
The three layers
- Technical. Can search engines reach, render and index the pages, and do those pages load fast enough on a phone to keep people on them.
- Content. Do the pages match what people search for, at the right depth, without competing against each other for the same term.
- Authority. Does anyone credible link to or cite the site, and is the existing link profile clean.
Most audits that disappoint clients stop after the first layer, because it is the easiest one to put in a spreadsheet.
The technical layer
Crawl the site and compare what you find to what Search Console reports as indexed. Gaps in either direction are the first clue. Then work through the mechanics: robots.txt, canonicals, redirect chains, status codes, hreflang if you run multiple regions, and sitemaps that reflect reality rather than a build from last year. Core Web Vitals come from field data, not a lab score.
The content layer
Map every page that earns organic traffic to the query earning it, then look for mismatches. Pages ranking for something you never intended. Two pages splitting the same term so neither wins. Service pages written for the business rather than the buyer. Old posts that ranked once and slid to page three because nobody touched them since.
Then look at what is missing. A good audit names the queries you have no page for, with volume attached. That list usually sets the next six months of work.
The authority layer
Compare your referring domains against three or four genuine competitors. Not by count, by quality and by which pages earn the links. Read the anchor text distribution for signs of paid links from a previous agency. Then check whether anyone cites you at all in the places your buyers actually read.
Turning findings into a plan
A findings list is not an audit. The output that earns its fee is a ranked plan: what to fix, in what order, what each fix is expected to do, and who owns it. We run audits inside ongoing technical SEO work rather than as a one off deliverable, because a PDF nobody actions changes nothing.
Rank by impact against effort. A canonical error affecting 4,000 product pages goes first. Rewriting one blog post goes last.
Related reading: our guides to technical SEO, manual actions, meta robots tags, fixing Crawled - currently not indexed, URL parameters and how to do an SEO audit.
Common questions
How often should a site be audited?
A full audit once a year suits most sites. In between, monitor monthly for the things that break quietly: index coverage, Core Web Vitals, broken links and lost backlinks. Always audit after a migration, redesign or CMS change, before the damage compounds.
How long does an SEO audit take?
For a site under 500 pages, roughly a week of work. Large ecommerce sites take two to three weeks because the templates multiply and the crawl takes longer to interpret properly. Anything promised in 24 hours is a tool export with a cover page on it.
Can I audit my own site with free tools?
You can get a long way. Search Console, PageSpeed Insights and a free crawler cover most of the technical layer. The hard part to do alone is judgement: knowing which of 200 flagged issues actually affects rankings and which are noise.
What is the difference between this and a technical audit?
A technical audit covers crawling, indexing, rendering and speed. A full SEO audit includes all of that plus content and authority. Ask which one you are buying, because the price quoted is often the same either way.
See our glossary entry for SEO audit.
