Launching a new website is exciting, but it's also one of the riskiest moments for your search rankings. I've seen businesses lose months — sometimes years — of SEO progress because the migration wasn't handled carefully. Here's what to get right.

Map your old URLs

Before anything else, create a complete map of every URL on your existing site and where it should redirect on the new one. Every old page needs a 301 redirect to its equivalent new page. If a page no longer exists, redirect it to the most relevant alternative.

This is the single most important step. Without proper redirects, all the authority and rankings your old pages have built up will be lost. Google will treat every un-redirected URL as a dead page.

Crawl your old site first

Use a tool like Screaming Frog to crawl your existing site before you make any changes. This gives you a complete inventory of pages, images, meta data, and internal links. It's your baseline — and it's much harder to reconstruct after the old site is gone.

Export the full crawl data and keep it somewhere safe. You'll reference it when building your redirect map and when verifying the new site post-launch.

Set up Google Search Console

If you haven't already, verify your new site in Google Search Console before launch. Once the new site is live, submit your updated sitemap immediately. This tells Google to start crawling the new structure.

Keep an eye on the Coverage report in the days after launch. It'll flag any pages that are returning errors, redirecting incorrectly, or missing from the index.

Update Google Ads

This one gets missed surprisingly often. If you're running Google Ads, check every landing page URL in your campaigns. If those URLs have changed on the new site, your ads will either 404 or redirect — both of which waste budget and hurt Quality Score.

Update your ad landing pages to point directly to the new URLs. While you're at it, check any sitelink extensions and callout URLs too.

Launching a new site is a project in itself, but taking these steps will protect the SEO value you've already built. Monitor your rankings closely for the first few weeks and be ready to fix any redirect issues quickly.