For these large migrations, the goal should be preserve SEO value, not preserve page count.
Google’s migration guidance supports creating a URL map, using permanent redirects, avoiding redirect chains, and redirecting old URLs to the most relevant new destination. It also specifically says consolidated content from multiple older pages can redirect to the new consolidated page, but many irrelevant redirects to one generic page can look like a soft 404.
☐ Confirm primary domain
☐ Audit all legacy domains (indexed URLs, traffic, backlinks)
☐ Identify high-traffic and ranking URLs
☐ Confirm DNS access
☐ Back up all existing sites' email lists and users' accounts
☐ Plan messaging for websites
☐ Create page-to-page 301 redirect mapping for key URLs
☐ Validate no redirect chains
☐ Maintain legacy domains active (minimum 12 months)
☐ Migrate high-value content not currently on primary domain
☐ Update XML sitemap
☐ Monitor rankings & impressions
☐ Check crawl errors
☐ Validate redirect functionality
☐ Monitor traffic patterns
☐ Monitor branded search trends
Day 1:
Submit sitemap
Submit Change of Address (if full migration)
Week 1–4:
Monitor coverage report
Watch for 404 spikes
Check crawl stats
Month 1–3:
Track visibility trend
Watch branded search growth
Compare revenue vs baseline
Document:
Date of migration
Redirect map
Pre-migration traffic
Client sign-off
Scope limitations