Quick answer
To migrate a website without losing rankings, inventory existing URLs with traffic, links and conversions; map each to the most relevant new URL; implement permanent 301 or 308 redirects; preserve important content, titles and structured data; update internal links, canonicals and sitemaps; remove staging noindex and robots blocks; use Search Console’s change of address tool for domain moves; and monitor indexing, rankings, traffic and enquiries closely after launch.
Key takeaways
- Map every valuable old URL to a relevant new URL.
- Use permanent redirects and avoid chains.
- Preserve content that earns traffic and enquiries.
- Staging settings like noindex are a common launch disaster.
Who this guide is for
Marketing managers, developers and agencies planning a website redesign, CMS change, domain change or HTTPS move.
Benchmark before you change anything
Record current performance: organic traffic, top landing pages, rankings for key queries, indexed pages, conversions by landing page, backlinks to specific URLs and Core Web Vitals. Export Search Console and analytics data for a meaningful period. Without a baseline, you cannot tell whether changes after launch are migration problems or normal fluctuation.
Inventory all URLs
Combine URLs from a site crawl, XML sitemaps, Search Console performance and indexing reports, analytics landing pages and backlink tools. Include PDFs, images that get search traffic and old campaign pages. Flag URLs with traffic, links or conversions as high priority. Decide what happens to each: keep, merge, redirect or retire.
Map redirects carefully
Map each old URL to the most relevant equivalent on the new site, not the home page. Use permanent redirects, 301 or 308, implemented at the server or edge. Avoid redirect chains and loops; old URLs should go directly to final destinations. For genuinely removed content without an equivalent, return 404 or 410 rather than redirecting everything to the home page, which search engines may treat as soft 404s.
Preserve content and on-page signals
Redesigns often shorten or remove content that was earning rankings. Keep or improve the substance of high-performing pages, their headings, titles and meta descriptions unless there is a reason to change them. Carry over structured data, image alt text and internal links. If URLs remain the same, the risk is lower, but content changes still matter.
Check technical settings at launch
Remove staging robots.txt disallow rules and noindex tags, verify canonicals point to new live URLs, update XML sitemaps and submit them, ensure HTTPS and preferred domain redirects work and check hreflang for international sites. Confirm analytics and conversion tracking fire correctly. Test a sample of redirects and key pages immediately after launch.
Use Search Console tools
Verify the new property if the domain changes and use the change of address tool when moving domains. Submit new sitemaps, and keep old sitemaps temporarily so search engines discover redirects. Inspect key URLs. Watch for crawl errors, indexing drops and manual action messages. Keep redirects in place for a long time, Google recommends at least a year, and ideally indefinitely for valuable URLs.
Monitor and respond
Compare traffic, rankings, indexing and conversions against the baseline daily for the first weeks, then weekly. Some fluctuation is normal while search engines process changes. Investigate pages with large drops: missing redirects, changed content, blocked resources or slower performance. Keep a log of fixes. A migration is complete when performance has stabilized, not when the new site goes live.
Scope checklist
- Is there a baseline of traffic, rankings and conversions?
- Are all valuable URLs mapped to relevant destinations?
- Are redirects permanent and free of chains?
- Have staging noindex and robots blocks been removed?
- Who monitors performance after launch, and for how long?
Frequently asked questions
Will a website redesign affect SEO?
It can if URLs, content or technical settings change without planning. A careful migration with redirects, preserved content and monitoring minimizes losses.
How long should 301 redirects stay in place?
Google recommends keeping redirects for at least one year; keeping them indefinitely for valuable URLs is safest.
Is it normal for traffic to drop after a site migration?
Temporary fluctuation is common while search engines process changes. Sustained drops usually indicate redirect, content or technical issues that need investigation.
Sources and implementation references
- Google Search Central: site moves with URL changes
Google’s migration guidance including redirect duration.
- Google Search Central: redirects and Google Search
Redirect types and how Google treats them.
Prepared with AI assistance as an engineering decision guide. Examples are illustrative unless explicitly labelled as an internal implementation. No independent expert review or customer outcome is claimed.
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