Site Migration SEO Guide
Discover how to properly plan and carry out a website migration without sacrificing SEO traffic. This guide includes essential checklists, redirect planning strategies, and best practices to follow after launch.
Grab a coffee before diving in—this guide is extensive. It’s designed to serve as a complete SEO resource for handling site migrations from start to finish.
The reality is that site migrations can be intimidating and risky from an SEO perspective. That part can’t be avoided.
However, there’s no need to fear them if you understand the right steps and the correct timing for each task.
Start by reading this guide thoroughly so you understand the full SEO migration process and how early planning affects the site launch and performance afterward. Then revisit each section during the migration process and use the checklist to ensure a successful launch of your new website.
Why SEO Matters During a Website Migration
Website migrations can greatly affect SEO because they often change key elements that influence search engine performance, including:
- URL structure
- On-page content
- Internal links
- Title tags
- Schema markup
And these are only a few examples.
Even a small migration requires a detailed SEO checklist. SEO aspects of a migration can be complex, and developers or team members may sometimes underestimate their impact.
There’s no way around it—site migrations carry SEO risks. Rankings can drop significantly, leading to reduced clicks and impressions. In extreme cases, pages or entire websites may become deindexed, and recovery can be slow if the migration wasn’t planned properly.
Consider the example of TransferWise changing its domain to Wise.
Before the migration, transferwise.com reached organic traffic peaks of 32,335,584 visits per month.
After the domain change to wise.com, traffic dropped to around 12,985,402 visits monthly.
Although this may sound concerning, proper planning can ultimately lead to stronger results. In the same example, wise.com eventually grew to 205,063,620 organic visits per month—about 500% more than the previous domain.
Sometimes migration preparation includes revising SEO strategies while anticipating temporary traffic losses.
7 Types of Site Migrations (And Their SEO Challenges)
Sites may be migrated for many reasons. Below are the seven most common types, along with examples and their potential SEO impact.
Keep in mind that every migration is unique. These examples provide a general overview, while detailed steps appear later in the checklist.
1. Replatforming
Replatforming involves moving a website from one content management system (CMS) to another, such as migrating from Magento to Shopify or from WordPress to Webflow.
SEO impact
Replatforming can significantly affect SEO because not every feature transfers perfectly to the new platform. Some functionality might not exist in the new system, and HTML output or CMS limitations may differ.
SEO teams should verify:
- Whether current plugins or extensions have equivalents on the new platform
- That metadata, including title tags, migrates correctly
- Whether the URL structure will change and if 301 redirects are needed
2. Site Redesign
A redesign may involve updating the entire site or just selected pages. Major design changes can alter headings, content, keywords, FAQs, internal links, and other on-page elements.
SEO impact
Significant changes to on-page content can affect page rankings. SEO specialists should collaborate closely with designers to ensure critical elements remain optimized.
It’s also helpful to capture screenshots or keep backups of the current site. Platforms like WordPress provide revision history so changes can be reversed if necessary.
3. Domain Change
Changing a domain is a major migration that can have substantial SEO consequences. The TransferWise to Wise example above demonstrates this type of migration.
Sometimes domain changes are unavoidable, so SEO teams must communicate clearly with stakeholders about potential traffic fluctuations.
SEO impact
When URLs change, search engines treat them as entirely new pages that must be crawled and indexed again.
The best strategy is to replicate content exactly on the new domain and implement page-by-page 301 redirects.
4. New Site Structure
Reorganizing a site’s structure—such as recategorizing services or adding subcategories—also counts as a migration.
For example, “SEO services” might become a parent category with subpages like “Local SEO services” or “E-commerce SEO services.”
A URL might change from:
www.example.com/seo
to
www.example.com/seo-services/local-seo
SEO impact
Structural changes usually require URL updates. Every modified URL should have a corresponding 301 redirect.
Internal links must also be updated, especially if breadcrumbs or structured navigation are used.
5. Website Consolidation
Consolidation occurs when multiple websites are combined into one. This can happen when businesses merge or when a company decides to unify several websites.
SEO impact
Consolidation often includes domain changes for one or more sites.
It can also create content duplication issues if multiple sites previously covered similar topics. All existing content should be audited to determine which pages should remain on the final site.
6. Site Location Changes
Websites using country-specific domains—such as .co.uk or .de—signal to search engines that they target a specific geographic audience.
A company might move from a regional domain like example.co.uk to example.com when expanding globally.
SEO impact
Besides URL changes, the main SEO factor is the effect on geographic rankings.
Hreflang tags may be required to help search engines understand the intended audience for each page. For example, hreflang=”en-us” indicates a page targeting English-speaking users in the United States.
7. HTTP to HTTPS Migration
HTTPS encrypts data between a website and its visitors, offering stronger security than HTTP. It has also been recognized as a ranking factor for many years.
Even sites that don’t handle sensitive information should use HTTPS because it ensures security and enables modern browser features.
SEO impact
Switching from HTTP to HTTPS changes every URL on the website, which requires redirects.
Another issue to monitor is mixed content. This occurs when secure HTTPS pages still reference resources—like images—loaded through HTTP.
SEO tools such as Semrush or Screaming Frog can help identify these issues.
Pre-Site Migration SEO Checklist
Regardless of the migration type, reviewing this checklist is essential. Much of the SEO work occurs before the migration begins, so frequent reviews during preparation are important.
1. Audit the Site and Benchmark Current Performance
Before migration, establish a clear understanding of the website’s current SEO performance. These benchmarks will be extremely useful later.
Collecting this data serves two key purposes:
- It encourages comprehensive evaluation of the site so potential improvements can be included in the new design.
- It demonstrates the value of SEO by allowing comparisons before and after the migration.
For example, the TransferWise to Wise migration later demonstrated a 500% traffic increase compared with the previous benchmark.
Google Sheets is useful for organizing this information. Create separate tabs for different datasets and keep all information in a single workbook.
Technical and Schema Data
- Run a site audit using an SEO tool and record errors, warnings, and notices.
- Document all schema markup used on the site.
- Review the robots.txt file to ensure correct indexing directives.
- Check canonical tags, especially on products, categories, and parameter-based URLs.
- Benchmark Core Web Vitals using tools such as PageSpeed Insights.
On-Page SEO and Backlinks
- Export organic traffic data from Google Search Console, including queries, pages, clicks, impressions, CTR, and average position.
- Capture screenshots of performance metrics for future comparison.
- List the site’s top-performing pages and their associated search queries.
- Record important keywords and their traffic over multiple time periods.
Marketing and Tracking
- Record metrics such as domain authority, backlinks, linking domains, organic traffic, and ranking keywords.
- Document all analytics tracking setups, such as Google Analytics events.
- Identify marketing technologies used on the site with tools like Wappalyzer.
- List all tags currently implemented using tools like Google Tag Assistant.
2. Crawl and Map Existing URLs
Perform a full crawl of the website using tools such as Screaming Frog or Sitebulb.
These tools simulate how search engine bots crawl websites and collect detailed data about URLs, content, metadata, schema, and more.
Export the crawl results to Google Sheets. This data will later help confirm that URLs were migrated successfully and will support the redirect plan.
3. Create a 301 Redirect Plan
A 301 redirect permanently sends users and search engines from an old URL to a new one.
During a migration, many URLs may change, so redirect mapping is critical.
Properly implemented 301 redirects:
- Inform search engines that a page has moved
- Preserve SEO authority from the original page
- Prevent users from encountering 404 errors
4. Coordinate Redirect Implementation with Developers
Developers typically implement the redirect plan. Discuss the preferred method with them before launch.
Two common approaches include:
- Bulk redirects, used when URL changes follow a consistent pattern.
- Page-by-page redirects, used when URL changes vary individually.
If redirects must be mapped individually, avoid shortcuts like redirecting all pages to the homepage. Each old page should redirect directly to the most relevant new page.
5. Identify High-Value Pages
High-value pages often include revenue-generating pages, but they may also include important blog posts, landing pages, or case studies.
Use Google Search Console and Google Analytics to identify pages with:
- High click volume
- Strong engagement
- Revenue impact
These pages should receive special attention during migration.
6. Identify Backlink Assets
Backlink assets are pages that naturally attract links, such as guides, tools, infographics, or calculators.
Use backlink analysis tools to identify pages with strong backlink profiles and ensure they are preserved during migration.
7. Don’t Overlook Images
Images are also indexed by search engines and can generate traffic.
Use Google Search Console’s image search filter to identify high-performing images that should be preserved or redirected during migration.
8. Back Up the Current Site
Before migrating, create a full backup of the website. If any problems occur, the backup provides a safe restore point.
Developers usually perform this backup through the hosting provider.
9. Prepare a Staging Site
A staging site is a copy of the existing site used for testing migration changes.
It allows developers to work without affecting the live website.
The staging site must be deindexed using a noindex, nofollow directive so search engines do not index it.
10. Prepare the XML Sitemap and robots.txt
The updated sitemap should:
- Include all new URLs
- Exclude removed pages
- Be ready for submission to Google Search Console immediately after launch
The robots.txt file should reference the sitemap location and control which sections of the site can be crawled.
11. Define Improvements for the New Site
Migration planning often reveals opportunities to improve SEO.
Document any insights that could improve performance and include them in design and development briefs.
12. Include SEO in Design and Development
Involving SEO specialists early allows them to influence the site structure and performance.
Possible recommendations may include:
- Adding FAQs or videos to meet search intent
- Implementing schema markup
- Improving Core Web Vitals
- Optimizing heading structures
13. Set Expectations with Stakeholders
Stakeholders should understand that migrations can impact traffic and rankings temporarily.
Be transparent about potential outcomes while explaining the steps taken to protect SEO performance.
14. Review the Staging Site Before Launch
Before going live, thoroughly test the staging site.
Verify that:
- Analytics tags are working
- Marketing tracking events function correctly
- Checkouts and purchase flows operate properly
- Forms and CTAs work
- Internal links are updated
- Headings and keywords appear correctly
Multiple reviewers should test the site to catch any remaining issues.
Launch-Day SEO Checklist
1. Launch During Low-Traffic Hours
Deploy the new site during periods of low traffic to minimize disruption.
Developers should remain available for at least 24–48 hours after launch to address any issues.
2. Remove Noindex Tags
Ensure the noindex,nofollow directive used on the staging site is removed. If left in place, it can prevent the live site from appearing in search results.
3. Verify Status Codes
Common status codes include:
- 200 – Page loads successfully
- 301 – Permanent redirect
- 302 – Temporary redirect (usually not used during migrations)
- 404 – Page not found
- 503 – Server error
Use crawling tools to confirm all pages return the correct status codes.
4. Confirm 301 Redirects
Test redirects on important pages to confirm they work correctly and lead to the appropriate destination pages.
5. Check for Broken Links
Use an SEO audit tool to identify broken internal or external links and fix them immediately.
6. Verify Tracking Tags
Confirm that analytics and tracking tags from the old site are properly installed on the new site.
7. Submit the XML Sitemap
Upload the updated sitemap in Google Search Console to encourage faster indexing.
8. Review robots.txt
Confirm that the robots.txt file references the sitemap and allows search engines to crawl important sections of the website.
9. Test Checkout and Forms
Verify that checkout processes, contact forms, and other conversion actions work correctly after launch.
Post-Migration SEO Checklist (First 30–90 Days)
The first few months after migration are critical for monitoring SEO performance.
1. Track Rankings and Traffic
Use Google Search Console to monitor rankings, traffic, and search queries.
Filtering data by country, keywords, or specific pages can help identify changes more accurately.
2. Monitor and Fix Errors
Regularly crawl the website to detect new errors or issues that may appear after launch.
3. Resubmit Pages or Sitemaps if Needed
If pages are not indexed, request indexing in Google Search Console or resubmit the sitemap.
4. Resolve Redirect Chains
Redirect chains occur when multiple redirects lead to a final page. These should eventually be simplified so links point directly to the final URL.
5. Update Backlinks Where Possible
Contact website owners linking to your site and ask them to update their links if URLs have changed.
Focus on:
- High-authority websites
- Pages generating strong traffic
- Relevant industry websites
6. Perform a Post-Launch SEO Audit
About 30 days after launch, conduct a complete SEO audit to ensure performance remains stable.
At minimum, review:
- Organic traffic
- Keyword rankings
- Backlinks and referring domains
- Analytics tracking
- Top-performing pages
Common SEO Migration Mistakes to Avoid
Incorrect Indexation
Check whether the live site is indexed by searching:
site:yourwebsite.com
The staging site should never appear in search results.
Losing Metadata
Title tags and metadata can easily be lost during migration. Use SEO tools or crawlers to confirm all metadata remains intact.
Ignoring Internal Links
Internal links must match the new URL structure.
If old URLs remain, they may cause 404 errors or unnecessary redirects. Updating them before launch helps maintain a smooth user experience and stronger SEO performance.
FAQs
What is a site migration in SEO?
A site migration refers to major changes made to a website that can affect its visibility in search engines, such as domain changes, platform migrations, URL restructuring, or moving from HTTP to HTTPS.
Why is SEO planning important during a site migration?
Proper SEO planning ensures that rankings, traffic, and backlinks are preserved during the transition, reducing the risk of search visibility loss.
What are the most common types of website migrations?
Common migrations include domain changes, CMS platform changes, website redesigns, URL structure updates, and protocol changes such as switching from HTTP to HTTPS.
How can redirects protect SEO during a migration?
Implementing proper 301 redirects ensures that both users and search engines are automatically directed from old URLs to the correct new pages, preserving link equity and rankings.
How long does SEO recovery take after a site migration?
Recovery time varies depending on the scale of the migration, but it typically takes a few weeks to several months for search engines to fully process and reindex the updated website.
Should you update internal links during a migration?
Yes, internal links should point directly to the new URLs instead of relying on redirects, which improves crawl efficiency and user experience.
What role does a sitemap play during site migration?
Updating and submitting a new XML sitemap helps search engines discover new URLs faster and understand the updated site structure.
How can you monitor SEO performance after a migration?
Tools like Google Search Console and Google Analytics can help track indexing status, traffic changes, crawl errors, and keyword performance after the migration.
Is it necessary to keep the old domain active after migration?
Yes, keeping the old domain active for a period allows redirects to function properly and ensures that users and search engines are guided to the new site.
What are common SEO mistakes during site migration?
Common mistakes include missing redirects, broken links, lost metadata, blocked search engine crawlers, and failing to update canonical tags.
Should you migrate content and design at the same time?
Combining multiple major changes can increase risk. Many SEO professionals recommend migrating in stages when possible to better isolate potential issues.
How important is pre-migration testing?
Pre-migration testing is critical to identify broken links, redirect errors, missing pages, and crawl issues before the new site goes live.
Does a site migration always cause traffic drops?
Short-term fluctuations are common, but a well-planned migration should minimize traffic loss and may even improve performance if the new site is better optimized.
How can you inform search engines about a domain change?
If migrating to a new domain, you can notify Google using the Change of Address tool in Search Console to help speed up the transition.
What is the best time to perform a site migration?
Many businesses choose periods of lower traffic to minimize disruption and allow teams to closely monitor and resolve issues quickly.
