Do 404 pages in a site's structure really hinder crawling?

What does Google mean by "intermediate 404 pages" in a structure?

This refers to a common situation: your site shows a page /products/shoes/running/model-123, but the URL /products/shoes/running/ returns a 404. The parent page does not exist in your actual structure.

This often happens in CMS where URLs are generated dynamically without creating real category pages for each level. Google clearly states that this configuration does not block the crawling of child pages. Googlebot can reach /model-123 even if /running/ is a 404.

Why does this statement contradict a common belief?

For years, it has been drilled into us that a clean architecture with all levels accessible is essential. Many SEO experts still believe that a missing level in the structure creates a "gap" that harms crawling.

Google clarifies: it's not the 404 itself that's problematic. It's the fact that this non-existing page receives internal links. If your breadcrumb points to /running/ which returns a 404, Googlebot will crawl that URL for nothing, over and over, every time a child page is visited.

What is the real variable that matters here?

The internal linking. If your intermediate 404 pages are not linked anywhere — no clickable breadcrumb, no menu, no footer link — Googlebot will likely never discover them. No unnecessary crawling, no wasted budget.

Conversely, if your template automatically generates links to these ghost levels, you create empty crawl loops. The bot visits hundreds of URLs that return 404, to the detriment of content-rich pages. That's where the problem lies.

• A 404 on an intermediate level does not prevent the crawling of child pages if they are accessible through other paths (direct links, XML sitemap).
• The problem only arises if these empty pages receive recurring internal links, forcing Googlebot to visit them in loops.
• A "perfect" architecture with all levels accessible is still preferable, but its absence is not a deal-breaker if the linking is controlled.
• The XML sitemap can compensate by directly listing the final URLs, without passing through the missing intermediate levels.
• Server logs are your best tool to check whether Googlebot is wasting time on these 404s or not.

Is this statement consistent with real-world observations?

Yes, but with nuances. On e-commerce sites with thousands of products, we regularly see Googlebot crawling final pages even if an intermediate category level is missing. The XML sitemap plays a key role: it allows us to bypass the traditional structure.

However, on sites with aggressive automatic internal linking — breadcrumbs, dynamic menus, contextual links — the intermediate 404s can become a crawl sinkhole. I've seen cases where 30% of the crawl budget was spent on non-existent category levels. [To verify] in your logs: if you don't audit, you'll never know if Google really doesn't care or if these 404s are hurting your effectiveness.

What are the limitations of this Google statement?

Google says "does not directly affect crawlability", but this wording is vague. It doesn’t mean it is without consequences. A site with a janky architecture full of gaps risks seeing its internal PageRank poorly distributed, even if technically Googlebot can crawl everything.

Second limitation: on large sites, even without internal links to those 404s, Googlebot can discover them via external referring URLs, old backlinks, or exploration patterns. The result? These empty pages still appear in your logs. Let’s be honest: saying "no internal link = no problem" is a bit simplistic.

In what cases does this rule not apply?

On a site with complex pagination, multiple facets, or URL filters, intermediate levels can be dynamically generated without us realizing it. If your CMS creates links to /category/page/2/ but that URL returns 404 because the category does not exist… Google will crawl each pagination variant as a 404.

Another case: migrations. If you move a structure and the old intermediate URLs do not redirect, Googlebot can continue to visit them for months via external or historical links. A silent 404 then becomes a crawl black hole, regardless of your current internal linking.

How can I check if these intermediate 404s are a problem on my site?

First step: analyze your server logs from the last 30 days. Filter Googlebot requests and identify the 404 URLs crawled more than 10 times. If you see patterns of intermediate levels (e.g., /category/subcategory/) coming back in loops, it's a red flag.

Next, trace the source of internal links. Use Screaming Frog or Oncrawl to map which templates generate links to these ghost levels. The breadcrumb is often the number one culprit. If every product page points to a 404 category, you have a structural problem.

What should be prioritized for correction?

If your intermediate 404s receive internal links, you have three options. First solution: create the missing pages with real content. This is the ideal approach but resource-intensive.

Second option: modify your templates so that these levels are no longer clickable. Make the breadcrumb plain text or redirect clicks to the existing upper level. Third option (riskier): use the robots.txt file to block these URL patterns, but be careful not to accidentally block useful pages. [To verify] in a staging environment before deploying.

What mistakes should be absolutely avoided?

Do not turn your 404s into soft 404s by displaying generic content with a 200 code. Google hates that and can penalize the entire site if the pattern is widespread. If a level does not exist, own the clean 404 or create a real page.

Another classic mistake: redirecting all intermediate 404s to the homepage. This dilutes your internal PageRank, and Google may interpret this as an attempt to mask issues. Prefer a targeted redirect to the closest existing parent level, or leave the 404 if no coherent alternative exists.

• Audit your logs to identify intermediate 404s repeatedly crawled by Googlebot.
• Map the sources of internal links to these levels (breadcrumbs, menus, templates).
• Decide: create the missing pages, modify the templates, or block via robots.txt.
• Never turn a 404 into a soft 404 with fake content returning a 200.
• Avoid massive redirects to the homepage — target the relevant parent level.
• Test changes in a staging environment before deploying to production.