A technical SEO audit examines the infrastructure and backend elements of your website to find issues that hurt search engine visibility. Unlike content audits that focus on what you say, technical audits diagnose how search engines access, crawl, index, and interpret your site architecture. The audit typically covers crawlability (robots.txt configuration, XML sitemaps, internal linking structure, redirect chains), indexation health (duplicate content, canonical tags, noindex directives, pagination handling), site performance (Core Web Vitals, page speed, server response times, mobile usability), and structural elements (schema markup, hreflang tags for multilingual sites, HTTPS implementation, URL structure). Most audits use a combination of tools. Screaming Frog or Sitebulb crawl your site like Googlebot would, revealing broken links, redirect loops, and orphaned pages. Google Search Console provides real coverage reports and Core Web Vitals data directly from Google. PageSpeed Insights measures actual loading performance. For a 500-page site, expect to find 40–150 actionable issues; for enterprise sites with 50,000+ pages, that number often exceeds 1,000. The output should be a prioritized spreadsheet or report categorizing issues by impact and effort. Critical items like site-wide canonicalization errors or broken XML sitemaps get fixed first. Lower-priority issues like minor speed optimizations on low-traffic pages get queued. At Ottawa SEO, we run technical audits quarterly for active clients and immediately when traffic drops unexpectedly. A solid audit takes 8–20 hours depending on site complexity, not including fix implementation. The biggest mistake is generating a 200-item checklist and then doing nothing because it's overwhelming. Better to fix 15 high-impact issues than to document 200 and address none. Technical SEO isn't a one-time event—sites accumulate technical debt as you add pages, change platforms, or update plugins, so ongoing monitoring catches problems before they tank your rankings.