Site Migration? Paid Search Still Gets the Sloppy Seconds—And That’s Killing Your ROI
Let’s cut through the horseshit: every time a site migration hits the calendar, Google’s organic playbook gets paraded out like scripture. There’s a whole cottage industry of SEO agencies clutching their checklists—301s, canonical tags, GSC revalidation, ad nauseam. But paid search? Crickets. If you’re running PPC in 2026 and think migration is just an SEO headache, congratulations—you’re probably torching tens of thousands in wasted spend while your campaigns blindly chase broken URLs and mismatched landing pages.
Case in point: last Monday, a retail client’s agency migrated them from their crusty old Magento mess to a shiny (read: slow) Shopify theme. The SEO team had their act together. But the Google Ads side? Not a single landing page URL was updated in their ad groups. Result: 43% of paid clicks dumped into 404s or limp redirect chains. Quality score tanked, CPCs spiked, and the client’s CMO was left wondering why their back-to-school campaign suddenly started bleeding money.
Here’s the dirty secret: Google’s own documentation for paid search migration is a peak nothingburger. Their advice boils down to “update your URLs” and “monitor performance.” No mention of URL mapping, ad extension audits, conversion tracking resets, or the landmine of automated bidding strategies sabotaged by post-migration chaos. And don’t expect your average ‘10x agency’ to save you—they’re too busy stuffing ChatGPT prompts into their QBR decks.
You want a playbook? Start with a full export of every destination URL in your ad inventory. Map them—manually, not with some lazy plugin—to new site paths. Pause all campaigns before migration day. Audit every extension, every sitelink, every conversion pixel. Test the damn ads. Only then do you turn the faucet back on. Anything less is malpractice, and if your agency shrugs it off, fire them before they light more of your budget on fire.
Don’t wait for Google to spoon-feed you best practices—they’re making too much money off your mistakes. If you want to survive this autumn’s migration season with your paid search budget intact, get your hands dirty and build your own damn playbook.
Frequently Asked Questions
What happens to paid search campaigns during a site migration if URLs aren’t updated?
If URLs aren’t updated during a site migration, paid search campaigns can send clicks to 404 pages or redirect chains, resulting in wasted ad spend and poor campaign performance.
Why does paid search performance drop after a site migration?
Paid search performance drops after a migration when outdated URLs cause quality scores to fall and cost-per-clicks to rise due to broken or mismatched landing pages.
Does Google provide comprehensive guidance for paid search during site migrations?
No, Google’s documentation for paid search migration is minimal and omits crucial steps like URL mapping, ad extension audits, and conversion tracking resets.
What steps should marketers take to protect PPC campaigns during a site migration?
Marketers should pause all campaigns, manually map old URLs to new ones, audit every ad extension and conversion pixel, and thoroughly test ads before relaunching.
Is following the standard SEO migration checklist enough to protect paid search campaigns?
No, relying solely on the SEO migration checklist neglects critical PPC elements and can lead to significant wasted ad spend and campaign issues.
