Quick answer: To do a technical SEO audit, start by crawling your site with a free tool like Screaming Frog, check your indexation status in Google Search Console, then review site speed, mobile-friendliness, structured data and internal links. Fix critical crawl and indexation errors first, since these block search engines from seeing your content at all. A first audit typically takes two to four hours for a small site.
You can publish excellent content and still lose visibility if search engines cannot properly crawl, read or understand your site. A technical SEO audit finds and fixes the underlying issues that quietly suppress your rankings, often without any obvious symptoms on the surface.
This guide walks through a complete audit in order of priority, from the free tools you need to a realistic time estimate for your first pass.
What Is a Technical SEO Audit?
A technical SEO audit is a review of the backend factors that affect how search engines crawl, index and rank your website. It looks at site architecture, page speed, indexation status, structured data and security, rather than the content itself.
This is different from an on-page audit, which focuses on title tags, meta descriptions and keyword targeting per page, and a content audit, which looks at content quality and topical gaps. Technical issues come first, since if search engines cannot crawl a section of your site, no amount of content investment there will produce rankings.
Tools You Need Before Starting
You do not need an expensive toolkit for your first audit. These free tools cover most of what a small or medium site needs.
Google Search Console. Free and essential. Shows you exactly how Google sees your site, including indexation status and crawl errors.
Screaming Frog. The free version crawls up to 500 URLs, which covers most small business websites completely. It simulates how search engine bots move through your site.
Google PageSpeed Insights. Free, and gives you the exact Core Web Vitals data Google uses as a ranking factor.
Paid tools like Ahrefs and Semrush add convenience and deeper backlink data, but are not required for a genuinely useful first audit.
Step 1: Check Crawlability and Indexation
This is the foundation everything else depends on. If search engines cannot crawl or index your pages, nothing else in this audit matters yet.
In Google Search Console, go to the Coverage report and check how many of your pages are indexed against how many you expect. Run a “site:yourdomain.com” search on Google to see roughly what is currently indexed, and compare that number against your actual page count for a rough sanity check.
Check your robots.txt file for any rules accidentally blocking pages you want indexed, and check individual important pages for accidental noindex tags, which is one of the most common and most damaging technical mistakes on small business sites.
Step 2: Run a Full Site Crawl
Point Screaming Frog or a similar crawler at your domain and let it run a complete scan. This simulates how search engines move through your site and flags common issues automatically.
Once complete, look specifically for:
- 404 errors and dead pages. These waste crawl budget and frustrate visitors arriving from search results or external links.
- 5xx server errors. These indicate hosting problems that actively block page delivery.
- Redirect chains and loops. Multiple or circular redirects slow crawling and can cause bots to abandon a page entirely.
- Missing or duplicate meta tags. Missing title tags and meta descriptions, or the same ones repeated across multiple pages.
Step 3: Test Site Speed and Core Web Vitals
Run your homepage and a typical inner page through PageSpeed Insights. Pay particular attention to your Core Web Vitals scores, since Google uses these directly as a ranking signal.
If your scores are weak, our detailed guide on how to speed up a WordPress website covers the full fix process, from hosting and caching through to image optimisation.
Step 4: Check Mobile-Friendliness
Google uses mobile-first indexing, meaning it primarily evaluates the mobile version of your site for ranking purposes, even for searches performed on desktop.
Check your site on an actual phone, not just a browser resize, and specifically look for text that is too small to read, buttons too close together to tap accurately, and any content that only appears on desktop but is missing from the mobile version.
Step 5: Review Structured Data
Structured data, also called schema markup, helps search engines understand exactly what your content represents, such as an article, a product, an FAQ or a recipe. It also increases your chances of earning rich results in search, and of being cited directly by AI answer engines.
Check your existing structured data using Google’s Rich Results Test, and add FAQ or article schema to pages missing it, particularly on your most important content.
Step 6: Audit Internal Linking
Internal links help search engines understand your site’s structure and pass authority between related pages. Look for orphan pages, meaning pages with no internal links pointing to them at all, since these are much harder for search engines to discover and rank.
Also check that your most important pages receive the most internal links, and that your anchor text is descriptive rather than generic phrases like “click here” that give search engines no context.
Step 7: Check HTTPS and Security
Confirm your entire site runs on HTTPS, not just your homepage, and that there are no mixed content warnings where secure pages load insecure resources. HTTPS has been a confirmed ranking factor for years, and browsers now actively flag non-secure sites to visitors, which damages trust immediately.
How Long Does a Technical SEO Audit Take?
Most competitors skip this question entirely, which leaves people unsure whether they are moving at a reasonable pace. For a small business site under 100 pages, a genuinely thorough first audit typically takes two to four hours, including the crawl, review and prioritisation of findings.
Larger sites with several hundred pages or more can take a full day or longer for a first pass, particularly if significant issues surface that need deeper investigation. Subsequent audits move faster once you know your site’s common patterns and have already fixed the biggest structural issues.
How to Prioritise What You Find
A first audit often surfaces more issues than you can fix immediately, so prioritise using this order.
Critical, fix first: indexation blocks, 5xx server errors, and pages that should rank but are accidentally noindexed. These directly prevent search engines from seeing your content.
High priority: broken internal links, poor Core Web Vitals scores, and missing structured data on key pages. These limit performance without blocking it entirely.
Lower priority: minor duplicate meta descriptions, small crawl inefficiencies, and cosmetic structured data gaps on less important pages. Worth fixing, but not urgent.
How Often Should You Re-Audit?
A full technical audit every three to six months catches most issues before they compound, alongside a quick indexation and crawl-error check in Google Search Console roughly once a month.
Always run a fresh audit after a site redesign, a platform migration, or any sudden unexplained drop in organic traffic, since these events are the most common source of new technical problems.
Frequently Asked Questions
How long does a technical SEO audit take?
A thorough first audit for a small business site under 100 pages typically takes two to four hours. Larger sites can take a full day or longer.
What tools do I need for a technical SEO audit?
Google Search Console and the free version of Screaming Frog cover most of what a small business site needs, alongside Google PageSpeed Insights for speed and Core Web Vitals data.
How often should I do a technical SEO audit?
A full audit every three to six months is a reasonable cadence, with a quick monthly check of indexation and crawl errors in Google Search Console in between.
What is the difference between a technical audit and an on-page audit?
A technical audit covers crawlability, indexation, speed and site architecture. An on-page audit focuses on individual page elements like title tags, meta descriptions and keyword targeting.
What should I fix first after a technical SEO audit?
Fix indexation blocks and server errors first, since these directly prevent search engines from seeing your content. Then move to Core Web Vitals and structured data gaps.
Can I do a technical SEO audit without paid tools?
Yes. Google Search Console, the free version of Screaming Frog, and PageSpeed Insights together cover a genuinely thorough audit for most small business websites at no cost.
Bringing It Together
Work through this audit in priority order: crawlability and indexation first, then speed, mobile-friendliness, structured data and internal links. Fix what blocks search engines before optimising what merely limits performance. If you are looking for tools to make future audits faster, our roundup of the best SEO tools for beginners is a solid next read.
