Why Your Rankings Dropped A Technical Website Audit to Find the Hidden Leaks

You checked your rankings last month and they were fine. You checked this week and they have dropped, noticeably, possibly significantly. No obvious change on your end. No announcement from Google you can point to. Just a gap where your positions used to be.

This is an unsettling situation, and it is more common than most business owners expect. The good news is that ranking drops almost always have a cause, and the cause is almost always identifiable and fixable.

This guide takes you through the most likely culprits and the audit process to find them.

Start Here: Google Search Console

Before anything else, open Google Search Console and look at three reports:

Coverage: Are there new pages showing as excluded, crawl errors, or indexing problems that were not there before? Any spike in “Excluded” or “Error” URLs is a signal worth investigating immediately.

Performance: Filter by date range to compare the period before and after the drop. Are specific pages affected? Specific queries? A cluster of affected pages points you towards the problem more precisely than site-wide data.

Core Web Vitals: Any recent deterioration in Largest Contentful Paint (LCP), Interaction to Next Paint (INP), or Cumulative Layout Shift (CLS) can affect rankings, particularly for competitive terms.

Technical SEO Audit Checklist

Work through the following in order. Each item is a potential source of ranking leaks.

Crawlability and Indexation

• Is your robots.txt file accidentally blocking Googlebot from crawling key pages or resources? This is a shockingly common cause of sudden ranking drops, particularly after a site redesign.
• Are any pages inadvertently tagged with noindex meta tags? Check page-level source code, not just your CMS settings. A plugin update can introduce noindex tags silently.
• Is your sitemap submitted in Google Search Console and returning 200 OK? Does it include all pages you want indexed, and exclude pages you do not?
• Are any important pages orphaned, meaning they exist but have no internal links pointing to them? Googlebot discovers pages primarily through links; orphaned pages are frequently undercrawled.

HTTPS and Technical Integrity

• Is your site serving entirely over HTTPS with no mixed-content warnings? Mixed content (HTTP resources on an HTTPS page) can trigger browser security warnings and affect crawling.
• Are all HTTP URLs redirecting correctly to HTTPS? A misconfigured certificate renewal can break redirects silently.
• Are canonical tags correctly set on all key pages, pointing to the preferred URL? Self-referencing canonicals pointing to the wrong URL or missing entirely can cause indexation problems.

Site Speed and Core Web Vitals

• What is your Largest Contentful Paint on mobile? A result over 2.5 seconds is poor and may be suppressing rankings on mobile searches.
• Are large, unoptimised images being served? In 2026, all images should be in modern formats (WebP or AVIF), appropriately sized for the display context, and lazy-loaded below the fold.
• Is your hosting performing as expected? A shared hosting environment under load or a poorly configured CDN can introduce speed regressions that are not immediately obvious.

Mobile Usability

• Is the site passing Google’s mobile usability test with no errors? Common failures include text too small to read, clickable elements too close together, and content wider than the screen.
• Is the viewport meta tag correctly set on every page?

Structured Data and Schema

• Are there any schema markup errors flagged in Google Search Console’s Rich Results Test? Broken structured data can lose you rich result eligibility and in some cases trigger manual review.
• Has your LocalBusiness schema address information remained consistent with your Google Business Profile and key directory listings?

Internal Linking and Site Architecture

• Has the site architecture changed recently? A redesign that flattens your URL structure, changes navigation, or removes internal links to key pages can disrupt the flow of authority to your commercial pages.
• Are your most important commercial pages receiving internal links from other content on the site? Pages that are hard to reach from the internal navigation tend to accumulate less crawl frequency and link equity over time.

Recent Changes

This is often the most direct path to the cause of a sudden drop. What changed on the site in the weeks before the rankings moved? A redesign, a platform migration, a new plugin, a theme update, a new server. Any of these can introduce technical problems that take weeks to fully manifest in rankings.

Check your version control or deployment history if you have access to it. Even small changes (adding a tag manager container, changing the site URL structure) can have downstream SEO effects.

After the Audit: Prioritising Fixes

Not all issues carry equal weight. Fix in this order:

1. Crawlability blockers (robots.txt, noindex tags, broken redirects), these are the highest urgency as they directly prevent Google from seeing your pages
2. Canonical and indexation problems, these affect which version of your pages Google chooses to rank
3. Core Web Vitals failures, particularly on mobile, where Google’s ranking signals are based on mobile-first indexing
4. Schema errors, important for rich results and local visibility
5. Internal linking gaps, valuable but typically slower to produce results

For a complete picture of how technical health fits into your overall SEO programme, the SEO hub covers the full landscape. If you would like a professional review of why your rankings have dropped and a prioritised fix plan, our SEO agency in Lincoln offers technical audits as a standalone service.