In short
A 2026 technical SEO checklist covers six areas: crawlability and indexing, Core Web Vitals and speed, schema and structured data, internal linking and architecture, AI-engine readiness (clean HTML, semantic structure, FAQ schema), and analytics health. Work through it quarterly and most technical issues will never reach production.
Crawl and index
Nothing else matters if Google and AI engines can't crawl and index you.
- Clean, submitted XML sitemap
- Robots.txt allowing key paths
- Canonical tags on every indexable page
- No accidental noindex on commercial pages
- Hreflang correct if multi-region
Core Web Vitals and speed
Speed is now a ranking signal and a conversion lever.
- LCP under 2.5s on mobile
- INP under 200ms
- CLS under 0.1
- Image and font optimisation, lazy-loading below fold
- No render-blocking scripts above the fold
Schema and structured data
Schema is how machines (Google and AI engines) understand your pages.
- Organization with sameAs on the homepage
- Article schema on blog content
- FAQPage on Q&A blocks
- BreadcrumbList sitewide
- Product, Service or LocalBusiness where relevant
Architecture and internal links
Information architecture and internal links control how authority flows.
- Topic clusters with hub pages
- Every commercial page linked from a hub
- Breadcrumbs on deep pages
- No orphan pages
- Clean URL structure
AI-engine readiness
New for 2026 — making your site easy for LLMs to parse.
- Semantic HTML, not div soup
- Server-side rendered content (no critical JS-only content)
- Direct-answer blocks on commercial pages
- FAQ schema on key pages
- llms.txt and ai.txt files (where supported)
Analytics health
Bad data is worse than no data.
- GA4 configured with enhanced measurement
- Server-side GTM where possible
- Conversion definitions agreed and documented
- Offline conversion uploads from CRM
