Technical SEO Audit for Agencies: What to Actually Check
A proper technical audit prioritizes crawl blocking, HTTPS, and Core Web Vitals first, then works through site structure, canonical and redirect issues, JavaScript rendering, structured data, and on-page technical elements. Agencies commonly run this at onboarding, quarterly, and after any major site change.
A technical audit done in the wrong order wastes time fixing cosmetic issues on a site Google can't even properly crawl yet.
Priority One: Crawling and Indexing
Confirm robots.txt isn't blocking important pages, the XML sitemap is clean and submitted, and Search Console's index coverage report matches expectations. Stray noindex tags and uncontrolled URL parameters belong in this first pass — nothing else on the audit matters if crawlers can't reach the pages in question.
Priority Two: Site Structure
Key pages should sit within a few clicks of the homepage, with a clear URL hierarchy and no orphaned pages. Internal links should actively point toward the priority URLs a client actually cares about ranking.
Priority Three: Performance and Page Experience
Core Web Vitals, mobile usability, layout shifts, and server response time all fall here — these affect both user experience and how search engines assess page quality.
Canonicals, Redirects, and Status Codes
Missing self-referencing canonicals, redirect chains and loops, and broken pages returning 4xx or 5xx errors all need resolution. HTTPS should be enforced sitewide, with one consistent preferred domain version throughout.
JavaScript and Rendering
Confirm the main content actually appears in rendered HTML, JavaScript isn't blocking indexation, and lazy loading is configured correctly — this matters most on JS-framework-built sites, where content can be invisible to crawlers despite looking fine to a human visitor.
Structured Data and On-Page Elements
Check for schema errors, confirm the correct schema types are applied consistently across templates, and verify each page has a single H1, a valid unique title tag, and a meta description within length limits.
How Agencies Should Scope and Schedule This
Set a clear scope before running a single crawl — whole site, specific section, or a targeted diagnosis for a traffic drop. Running the full audit at onboarding, then quarterly, and again after any major redesign or migration, catches issues before they compound.
Frequently Asked Questions
Crawl blocking and indexing issues — nothing else in the audit matters if search engines can't properly access the pages in question.
At onboarding, then quarterly, and again after any major site redesign, migration, or significant update.
Content can appear correctly to a human visitor while remaining invisible to crawlers on JS-framework-built sites, which standard checks can miss.
Sometimes, if crawl or indexing errors were actively capping visibility — but it's a foundation, not a full campaign. Content and links still need to follow for sustained movement.
Yes. A client-facing report that lists "312 crawl errors" without explaining what that means or why it matters isn't reporting the agency can actually use with a client.
Related Reading
- White Label Technical SEO Audit Checklist
- Core Web Vitals for Agency Clients: What Actually Matters
- Schema Markup for Local Businesses: What to Actually Implement
- Content Strategy for SEO Agencies: The Real Operating Model
Need this for a client right now? This is part of the process behind our white label SEO fulfillment — happy to walk through it on a call instead of waiting for the full write-up. Browse our full service list for the related work.