Content and backlinks get the attention, but technical SEO is the infrastructure they run on. If crawlers cannot reach your pages, if duplicate URLs dilute authority, or if Core Web Vitals fail on mobile, even excellent copy underperforms.
This checklist helps U.S. marketing leaders and operators audit a site before investing in content scale, paid media, or a redesign — and pairs naturally with a broader local SEO program or content marketing strategy.
Crawlability and indexation
Start in Google Search Console and a crawl tool (Screaming Frog, Sitebulb, or equivalent):
- Robots.txt — confirm you are not accidentally blocking
/blog/,/services/, or parameterized URLs you need indexed. - XML sitemap — only canonical, indexable URLs; updated after launches; submitted in Search Console.
- Noindex discipline — staging, thank-you pages, and thin filters should not leak into the index.
- Crawl depth — important service pages reachable within three clicks from the homepage.
- Internal links — orphan pages (zero inlinks) are a common reason good content never ranks.
- Log files (if available) — verify Googlebot hits priority templates, not endless faceted URLs.
Fix indexation before you publish ten new blog posts. Otherwise you are filling a leaky bucket.
Site architecture and URL hygiene
Marketing sites often grow by accretion — new landing pages, campaign URLs, and legacy paths that nobody owns.
- One clear URL per intent; consolidate duplicates with 301 redirects.
- Hyphenated, readable slugs —
/blog/technical-seo-audit-checklist/not/p?id=8842. - Breadcrumbs and HTML navigation that mirror hierarchy for users and crawlers.
- Pagination and archive pages handled intentionally (canonical tags where needed).
- HTTPS everywhere; mixed content and certificate errors erode trust signals.
If you are planning a website redesign, architecture decisions made in wireframes determine SEO outcomes for years.
Core Web Vitals and performance
Google uses page experience signals; users abandon slow pages regardless of rankings.
| Metric | What it measures | Common fixes |
|---|---|---|
| LCP | Largest paint delay | Optimize hero images, server response, critical CSS |
| INP | Interaction responsiveness | Reduce main-thread JavaScript, defer non-critical scripts |
| CLS | Layout shift | Set dimensions on images/embeds, reserve ad space |
Audit mobile first — most B2B research happens on phones even when contracts close on desktop. Compress images, lazy-load below the fold, and avoid theme bloat that loads unused CSS on every page.
Structured data and entity signals
Schema is not a ranking hack; it clarifies relationships for search and AI answer engines.
- Organization / LocalBusiness or ProfessionalService on the homepage.
- Service schema aligned with real offer pages — not generic MarketingService on every URL.
- Article schema on blog posts with accurate
datePublishedanddateModified. - FAQPage on service pages where answers are visible in HTML.
- BreadcrumbList on subpages.
Validate with Google’s Rich Results Test after every template change.
Redirects, migrations, and launch risk
The most expensive technical SEO mistakes happen at launch:
- Maintain a redirect map from every old URL to its best-match successor.
- Avoid redirect chains longer than one hop.
- Update internal links — do not rely on redirects forever.
- Monitor 404 spikes and Search Console coverage for 30–90 days post-launch.
- Preserve or improve title tags, meta descriptions, and H1s on high-traffic URLs.
Security, accessibility, and trust
- Valid SSL, HSTS where appropriate, no malware flags in Search Console.
- Accessible navigation and form labels — overlaps with UX and conversion.
- Clear contact information and privacy policy links; especially important for YMYL-adjacent industries.
Prioritization: what to fix first
- Blockers — indexation errors, manual actions, widespread 404s on money pages.
- Architecture — consolidate duplicates, fix orphans, simplify navigation.
- Performance — mobile CWV on homepage and top five landing pages.
- Schema — organization, services, articles, FAQs on templates.
- Monitoring — dashboards for coverage, CWV, and crawl stats.
When to bring in specialists
Technical audits intersect design systems, CMS configuration, and analytics. If your team lacks developer bandwidth or SEO ownership during a rebuild, an integrated partner prevents “beautiful site, invisible in search.”
Voixly ships websites with SEO, schema, and AI search optimization built into launch — not bolted on after go-live. Get Launched and we will walk your current site through this checklist with prioritized fixes.