This audit is structured differently from a prescriptive checklist. A checklist tells you what to build. A diagnostic tells you what's broken and why. Work through each section in order — technical first, local second, on-page third, authority last — because issues in earlier layers can mask or amplify problems in later ones.
You'll need three free tools to complete this audit:
- Google Search Console — crawl errors, index coverage, Core Web Vitals
- Google PageSpeed Insights — mobile and desktop performance scores
- Screaming Frog SEO Spider (free up to 500 URLs) — title tags, meta descriptions, broken links, redirect chains
Optional tools that add depth: Ahrefs or Semrush for backlink data, BrightLocal for citation auditing, and Google's Business Profile Manager for GBP diagnostics.
As you work through each section, score your findings on a simple three-tier scale: Critical (blocking rankings or crawling), Moderate (suppressing performance), or Minor (low-impact polish). By the end, you'll have a prioritized issue list rather than an overwhelming to-do pile.
One honest note: this walkthrough will show you what the problems are. Whether you fix them yourself or hand them to a specialist depends on your technical comfort level and how quickly you need results. If you end up with a list of Critical issues in multiple categories, that's a strong signal that professional help will pay for itself faster than self-remediation.