Launching a new website should be an exciting step forward for your business.
Unfortunately, if the migration isn’t handled correctly, it can also result in disappearing Google rankings, broken links and a sudden drop in organic traffic.
We’ve seen businesses invest heavily in beautiful new websites only to discover that years of SEO progress disappeared almost overnight.
The problem usually isn’t the new design itself. It’s what happened during the move.
Whether you’re redesigning an existing website, changing domain names, moving to a different CMS or restructuring hundreds of pages, SEO needs to be considered before the new website goes live.
Here’s what you need to know.
What Is a Website Migration?
A website migration is any significant change to a website that could affect how search engines access, understand or index its pages.
This can include:
- Redesigning a website
- Changing domain names
- Moving from HTTP to HTTPS
- Changing your URL structure
- Moving to a different CMS
- Moving an ecommerce store to another platform
- Combining multiple websites
- Removing or reorganising large sections of content
Even if the website looks similar after the change, Google may see it very differently.
Why Can Website Migrations Damage SEO?
Search engines build up an understanding of your website over time.
Individual URLs may have accumulated rankings, backlinks, authority and historical performance.
If those URLs suddenly disappear, Google needs to understand what happened to them.
Without the correct migration strategy, you can end up with:
- 404 errors
- Lost backlinks
- Missing pages
- Duplicate content
- Indexing problems
- Broken internal links
- Lost keyword rankings
This is why SEO should be part of the website migration process from the beginning rather than something considered after launch.
Benchmark Your SEO Before Making Changes
Before touching the existing website, establish what is currently working.
You should record important information including:
- Current keyword rankings
- Organic traffic
- Top-performing pages
- Indexed pages
- Backlinks
- Conversions and enquiries
This creates a benchmark that can be compared against the new website after launch.
Without this information, it becomes much harder to determine whether the migration has affected performance.
Create a Complete List of Existing URLs
One of the most important stages of any website migration is creating an inventory of the existing website.
You need to know which URLs currently exist before deciding what should happen to them.
This includes more than just the pages visible in your main navigation.
Your website may contain:
- Service pages
- Blog articles
- Product pages
- Product categories
- Location pages
- Landing pages
- Old campaign pages
Some of these pages may receive very little traffic, while others could be responsible for a significant percentage of your organic visibility.
Don’t Delete Valuable Content Without Checking It
A redesign often involves simplifying a website.
That’s generally a good thing, but deleting pages simply because they look old can be a costly mistake.
An apparently unimportant page might:
- Rank for valuable keywords
- Generate enquiries
- Receive backlinks
- Support other pages through internal links
Before removing any page, check whether it has existing SEO value.
If the information is still useful, consider updating or incorporating it into the new website instead.
Keep Important URLs Wherever Possible
If an existing URL performs well and there is no genuine reason to change it, keeping it can often be the safest option.
Changing URLs purely because a new structure looks tidier creates unnecessary risk.
There are certainly occasions when restructuring URLs makes sense, but those changes should be deliberate rather than accidental.
Use 301 Redirects Correctly
If an existing URL must change, a 301 redirect should normally point visitors and search engines towards the most relevant replacement page.
For example:
Old URL: /old-service-page/
New URL: /new-service-page/
The old address should permanently redirect to the new one.
This helps users reach the correct content and signals to search engines that the page has permanently moved.
One common mistake is redirecting every deleted URL to the homepage.
Redirects should instead lead to the closest relevant alternative wherever possible.
Don’t Forget Internal Links
Redirects protect old URLs, but your new website shouldn’t rely on them unnecessarily.
Internal links should point directly to the new destination.
This includes links within:
- Navigation menus
- Page content
- Blog articles
- Footers
- Product descriptions
- Calls to action
Updating internal links helps search engines crawl the new website efficiently and provides a cleaner experience for visitors.
Protect Your Page Titles and Metadata
During a redesign, it’s surprisingly easy for carefully optimised page titles and meta descriptions to be replaced with generic alternatives.
If an existing page performs well, review its current metadata before replacing it.
A new website doesn’t mean every element of the old website needs to disappear.
Keep what works and improve what doesn’t.
Check Your Heading Structure and Content
Design changes can also affect how content is structured.
Important headings may disappear or text that previously helped a page rank may be significantly shortened.
A visually cleaner page isn’t necessarily a better page for users or search engines if valuable information has been removed.
Review important landing pages carefully and make sure the new version still answers the questions visitors are searching for.
Check Mobile Performance
Your new website should be thoroughly tested across smartphones, tablets and desktop computers.
Check:
- Navigation
- Forms
- Buttons
- Text readability
- Images
- Page speed
- Interactive elements
A website that looks fantastic on a designer’s large monitor but performs badly on a mobile phone isn’t ready to launch.
Check Website Speed Before Launch
New websites often contain larger images, animations, additional scripts and more complex functionality.
These can all affect performance.
Before launching, test important pages and look for obvious performance issues.
Pay particular attention to large images, unnecessary scripts, excessive plugins and third-party tools.
Make Sure Search Engines Can Access the Website
Development websites are often deliberately hidden from search engines while they’re being built.
That’s good practice.
Forgetting to remove those restrictions when the website goes live is not.
Check that the live website isn’t accidentally using settings or instructions that prevent search engines from crawling or indexing it.
This simple mistake can make an entire website effectively invisible to Google.
Submit Your New Sitemap
Once the new website is live, make sure your XML sitemap contains the correct URLs and submit it through Google Search Console.
This helps Google discover the new structure and identify updated pages.
Your sitemap should only contain URLs you actually want search engines to index.
Check for Broken Links and 404 Errors
After launch, crawl the website and look for broken links.
Some 404 errors may only become apparent once visitors and search engines begin accessing older URLs.
Monitor these carefully during the first few weeks following migration.
Monitor Google Search Console
Launching the website isn’t the end of the migration.
Google Search Console can help identify:
- Indexing problems
- 404 errors
- Crawl issues
- Changes in search visibility
- Page performance
Regular monitoring allows problems to be identified and corrected quickly.
Should Rankings Drop After a Website Migration?
Some fluctuation can happen while search engines recrawl and process significant website changes.
That doesn’t mean a major loss of traffic should simply be accepted as normal.
If rankings fall dramatically and remain down, investigate the migration.
Check redirects, content, indexing, internal links and technical configuration before assuming Google simply doesn’t like the new website.
A Website Redesign Should Improve SEO, Not Destroy It
A migration doesn’t have to damage your search visibility.
In fact, a well-planned redesign can create an opportunity to improve SEO.
You can use the process to:
- Improve website speed
- Remove duplicate content
- Improve navigation
- Strengthen important landing pages
- Improve mobile usability
- Fix technical SEO problems
- Create a better internal linking structure
The important part is ensuring that you’re building on the authority of the existing website rather than accidentally throwing it away.
"*" indicates required fields
Final Thoughts
Website migrations bring together two disciplines that should never be treated separately: web development and SEO.
Your development team needs to understand what search engines require, while your SEO strategy needs to take account of how the new website is being built.
The safest approach is simple: understand what you already have, protect what’s working and carefully manage anything that changes.
A new website should give your business a stronger platform for future growth.
It shouldn’t mean starting again from zero.
“`
