Broken Link Building: A Step by Step Guide That Starts at Home

I have a confession about broken link building. For years I thought of it as the tactic you teach juniors: find a dead page, send a polite email, collect a link. Then I started auditing sites here in Barcelona and noticed that the best broken link opportunities were almost never on somebody else’s website.

They were on the client’s own. A redesign in 2021, or a move from Wix to WordPress, and suddenly dozens of good links from local press and industry associations still pointing at URLs that now return a 404, quietly leaking the authority the business had already earned.

I am Armen, an SEO consultant in Barcelona, and I run the agency ACERO Digital with a team of specialists. This guide walks through broken link building the way we actually run it, starting with the links you already own and only then moving out to other people’s sites.

What is broken link building?

Broken link building is the practice of finding links that point to pages which no longer exist, then offering a working page of yours as the replacement. The site owner repairs a dead end for their readers. You earn a link that sits in context, on a page that already chose to cite this kind of resource.

The logic is simple. A link to a 404 is a small embarrassment for the site hosting it. You are showing up with the fix.

Does broken link building still work in 2026?

Yes, but only if you stop treating it as a numbers game. Aira’s State of Link Building survey still places it among the tactics professionals use most, and that popularity is exactly the problem: every dead page about “content marketing statistics” has been pitched by fifty people before you.

Where it still works is in the narrow places. Industry associations, university library guides, municipal resource lists, trade directories in Spanish or Catalan. Nobody from a link building agency in Ohio is emailing the Col·legi d’Arquitectes about a dead PDF.

And it works best of all at home, which is where we start.

Step 1: Where should you start? With your own broken backlinks

Start by reclaiming links that point to dead URLs on your own site. This is broken link building with no outreach at all, because you control the fix: a 301 redirect from the dead URL to the closest live page.

Here is the process we follow on every audit:

1. In Ahrefs Site Explorer, open the Best by links report for your domain and filter by HTTP code 404. In Semrush, the equivalent is Backlink Audit filtered to target URL errors.
2. Cross check with the Pages report in Google Search Console, under “Not found (404)”, to catch URLs the backlink tools missed.
3. For each dead URL with real referring domains, open it in the Wayback Machine and see what it used to be.
4. Redirect it with a 301 to the page that genuinely replaces it. If nothing does, consider rebuilding it.

Step 4 is where people cut corners. Redirecting every dead URL to the homepage is lazy, and Google tends to treat irrelevant redirects much like a soft 404. The link only carries its value if the destination makes sense.

The pattern we see most often looks like this: a clinic in Barcelona gets a feature in a local newspaper plus a handful of hospital directory links, all pointing to an “equipo médico” page that was deleted in a redesign. Ten minutes in the redirect plugin can recover more authority than a month of outreach. If you suspect your site has the same leak, it is one of the first things we check in an SEO audit.

Step 2: How do you find broken links on other sites?

Look for dead pages in your topic that still have referring domains, then list every site linking to them. There are two reliable routes, and one local route that most guides ignore.

Your competitors’ dead pages. Run a competitor through Ahrefs Site Explorer, Best by links, 404 filter. Businesses close, rebrand and restructure constantly, and their old guides keep their backlinks for years.

Topic searches. Ahrefs Content Explorer lets you search a topic and filter to pages that are no longer live. Semrush’s Backlink Analytics does a similar job for a known domain.

Resource pages. Use search operators such as intitle:recursos or inurl:links together with your topic, then run each page through the Check My Links extension or a Screaming Frog crawl limited to that URL. Anything showing a 4xx response is a candidate.

The local route is the one I like most. Barcelona businesses close and their domains lapse, yet the neighbourhood association pages and old tourism listings keep linking to them for years. A dead link to a shuttered bakery in Sant Andreu is an opening for the bakery that is still open around the corner.

Step 3: How do you vet a broken link prospect?

Vet each prospect on relevance first, then on whether the linking page is alive and cared for. A dead link on a page nobody has touched since 2016 will probably stay dead, however good your email is.

Ahrefs Batch Analysis will pull the authority and traffic of a whole list of linking domains at once, which saves a lot of clicking. But the final call is a human one. Open the page and ask whether a reader would actually benefit from your replacement.

If the honest answer is “sort of”, drop it.

Step 4: How do you create a replacement page worth linking to?

Build or adapt a page that does the job the dead page used to do, better. Pull the old version from the Wayback Machine, note what people were linking to it for (usually one table or one checklist) and make sure your page delivers that specific thing near the top.

You do not need a new page for every prospect. Often an existing service guide or FAQ covers it with a small addition. What you cannot do is pitch your homepage as a replacement for a detailed guide on commercial lease rules. Editors notice, and they remember.

A dead page with forty referring domains justifies a proper piece of work. A dead page with two does not.

Step 5: What should a broken link building email say?

Name the broken link and offer the replacement, in under a hundred words. The editor should be able to act on it without scrolling.

Hi Marta, on your page of resources for new restaurant owners, the link to the licensing guide you cite now returns an error (the firm that published it seems to have closed). We published a guide that covers the same licensing steps for Barcelona and is updated for 2026: [link]. Happy to help either way. Armen

Find a named person first. The editor or the author of the page responds far more often than info@ ever will.

A word on doing this from Spain. Article 21 of the LSSI restricts unsolicited commercial email, and the Spanish data protection authority, the AEPD, enforces it with real fines. A short, personal note reporting a broken link to one editor is not the same thing as a mass promotional sequence, but I would not run automated campaigns of hundreds of cold emails from a Spanish company without legal advice. Keep it one to one, send one follow up at most, and stop when someone says no.

That restraint happens to be good link building anyway.

How do you measure a broken link building campaign?

Measure links won against hours spent, not emails sent. Keep a simple sheet with each prospect, the date you pitched, the reply and the outcome, and track the reclaimed links from Step 1 separately, because they behave differently: they are yours the moment the redirect goes live.

Then watch what the links actually do. In Search Console, check whether the pages receiving them gain impressions for their target queries over the following two to three months. A link that moves nothing was probably not worth the time, however strong the domain looked.

For most small and mid sized businesses, broken link building is one tactic inside a wider plan rather than a plan on its own. It fits best next to earning coverage and fixing the site itself, which is how our link building service is put together.

Where I would start this week

If you only do one thing after reading this, export your 404s with backlinks and redirect the ones that matter. No emails, no templates, no waiting for replies. On older business sites it is often the fastest link win available.

Only after that would I go looking for dead links on other people’s pages, and I would look locally first, where the competition for the same broken link is thin.

If you would like a second pair of eyes on which of your old URLs are still collecting links, or whether outreach is worth your time at all in your niche, get in touch and I will tell you honestly what I would do in your place.