Broken link building starts with identifying dead or 404 links on relevant external sites in your niche. You use tools like Ahrefs, Screaming Frog, or Check My Links browser extensions to scan resource pages, listicles, or industry directories for broken outbound links. The goal is to find URLs that once pointed to valuable content but now lead nowhere. Once you've compiled a list of broken links, you assess what content they originally linked to using the Wayback Machine or cached snapshots. If the dead resource was a guide, tool, or data piece similar to something you already have, you have a match. If not, you create or commission replacement content that fills the same need, ideally making it better or more current than the original. Outreach is the critical step. You email the site owner or editor, politely pointing out the broken link, explaining why it harms their user experience, and offering your live resource as a replacement. Your pitch needs to be helpful, not salesy. A typical message identifies the broken URL, suggests your alternative, and keeps the tone brief and respectful. Response rates vary widely, 5 to 15 percent is common, depending on niche and how well you target. At Ottawa SEO, we prioritize broken link building on high-authority pages with strong organic traffic, not random low-tier directories. We also batch outreach by domain rather than spamming dozens of unrelated sites. The tactic works best in niches with aging content like education, research, or local government resource lists, where link rot is common. It's less effective in fast-moving industries where sites update constantly. Key challenges include outdated contact info, slow responses, and cases where site owners simply remove the broken link rather than replace it. Despite this, broken link building remains one of the few white-hat tactics that delivers editorial links at scale when done methodically.