Key takeaways
- Website migrations lose rankings when redirects are missing, page URLs change without planning, or the new site is slower than the old one.
- Build a complete redirect map before touching anything " every old URL mapped one-to-one to its new equivalent.
- Notify Google through Search Console immediately after launch and submit your new sitemap.
- Most ranking drops after migration are temporary if redirects are comprehensive and content quality is maintained.
Redesigning or moving your website is one of the most common ways businesses accidentally destroy their Google rankings, often without realising until the traffic disappears weeks later. It does not have to be that way. This guide walks through how to migrate or redesign safely, keeping the rankings and traffic you have worked for.
Why do website migrations cause ranking drops?
Rankings are attached to specific URLs. When a URL changes without a redirect, Google treats the old page as deleted and the new one as unproven. Traffic and authority built over years disappears overnight.
When you change your website, you can change the things Google relies on to rank you: your URLs, your content, your site structure, your page speed. If old URLs vanish without redirects, or content is stripped back, or the new site is slower, Google sees a different, sometimes worse, site, and rankings can drop fast. The good news is that almost every cause is preventable with planning.
Changed or deleted URLs with no redirects. If your old pages return "404 not found", the rankings and links they earned are lost. Redirecting them properly is the most important step in any migration.
What should you do before migrating your website?
Crawl the old site to capture every URL, benchmark your current rankings and traffic, identify your most valuable pages, and build a complete redirect map before the new site goes live.
- Crawl your existing site and export every URL (free tools like Screaming Frog do this).
- Note your current rankings and top organic pages in Google Search Console and Analytics.
- Identify your most valuable pages, the ones driving traffic and enquiries.
- Benchmark current speed and Core Web Vitals so you can compare after.
- Plan your new URL structure, keeping existing URLs the same wherever sensible.
What is a redirect map and why is it essential for migration?
A redirect map is a spreadsheet listing every old URL alongside its new equivalent. It is the safety net that tells Google and users where to find each page after the move. Without it, every URL change is a ranking loss.
A redirect map is a simple list pairing every old URL with its equivalent new URL. Every old page that is changing address needs a 301 (permanent) redirect to the closest matching new page. This passes the ranking value across and sends visitors (and Google) to the right place. Skipping this is the number one cause of post-migration traffic loss.
| Situation | What to do |
|---|---|
| URL staying the same | No redirect needed |
| URL changing address | 301 redirect old to new |
| Page being removed | 301 to the most relevant alternative |
| Page genuinely gone with no equivalent | Let it 404/410, but check it had no value first |
How do you preserve on-page SEO during a website migration?
Transfer title tags, meta descriptions, heading structure and internal links from the old site to the new one. Do not use a migration as an opportunity to rewrite everything at once " change one thing at a time.
- Keep your important content, do not strip back pages that rank well.
- Preserve page titles, headings and meta descriptions on key pages.
- Carry over internal links and your overall structure.
- Keep (or improve) page speed, a slower new site can cost rankings.
- Migrate your schema/structured data.
Launch day checklist
- Test every redirect actually works before and after go-live.
- Make sure the new site is not accidentally blocking Google (check robots.txt and noindex tags).
- Submit your new XML sitemap in Google Search Console.
- Confirm HTTPS is working sitewide with no mixed content.
- Check analytics and tracking are firing on the new site.
- Crawl the live site to catch any broken links or missed redirects.
What are the most common types of website migration and their risks?
Domain changes (highest risk: all links must be redirected), CMS changes (medium risk: URL structure often changes), redesigns (lower risk if URLs stay the same), and HTTPS moves (low risk with correct redirects).
Not all migrations are the same, and each carries its own risks. Knowing which you are doing helps you plan for the right pitfalls.
| Migration type | Main risk | Key precaution |
|---|---|---|
| Redesign (same URLs) | Content or speed changes hurting rankings | Preserve content, titles and speed |
| New URL structure | Lost rankings from broken URLs | A complete 301 redirect map |
| New domain | Authority not transferring | Redirect every page, tell Google via Search Console |
| HTTP to HTTPS | Mixed content, duplicate URLs | Force HTTPS, redirect all HTTP versions |
| Platform change (e.g. Wix to WordPress) | URL and structure changes | Map every old URL to its new equivalent |
How to build a redirect map (step by step)
- Export every URL from your current site using a crawler like Screaming Frog.
- In a spreadsheet, list each old URL in one column.
- Next to each, add the matching new URL (or the closest relevant page if it is being removed).
- Flag any old URL with no sensible equivalent, decide whether it should redirect to a parent page or be retired.
- Implement the 301 redirects on the new site (via your CMS, a redirect plugin, or server config).
- Test every redirect after launch, an untested redirect map is just a hope.
If time is tight, make absolutely certain your highest-traffic and highest-converting pages redirect perfectly. Those are the ones whose lost rankings would hurt most.
How long does it take to recover Google rankings after a migration?
With comprehensive redirects, most rankings recover within one to three months. Without redirects, recovery can take six months or longer and some positions may never return.
After a well-executed migration, Google needs to re-crawl and re-index your site, which usually takes anywhere from a few days to a few weeks. A small, temporary dip during this settling period is normal and not a cause for panic. A sustained drop that does not recover after a few weeks signals a real problem, usually a missed redirect, a blocked site, or lost content, and should be investigated promptly. Done without proper redirects, rankings may simply not come back, which is why the preparation matters so much.
What are the most common website migration mistakes?
Launching without redirect testing, removing content without redirecting it, changing the site structure and design at the same time, and not monitoring Search Console for crawl errors in the weeks after launch.
- Launching with no redirect map, the single biggest cause of lost traffic.
- Accidentally leaving the new site blocked from Google (a stray noindex or robots.txt rule from the staging build).
- Stripping back content that was ranking well in the name of a cleaner design.
- Forgetting to migrate or update structured data and metadata.
- Not submitting the new sitemap, or not monitoring Search Console after launch.
- A slower new site, speed drops can quietly cost rankings.
Frequently asked questions
Will I definitely lose rankings when I migrate?
Not if it is done properly. With a complete redirect map, preserved content and proper testing, most sites see only a brief settling dip and recover within days to a few weeks. Rankings are lost when migrations skip these steps, not because migration itself is inherently risky.
Do I need to tell Google I have moved?
For a new domain, yes, use the Change of Address tool in Google Search Console and submit your new sitemap. For a redesign on the same domain, submitting the updated sitemap and monitoring coverage is enough.
Should I keep my old URLs if I can?
Where it makes sense, yes, keeping URLs unchanged removes the biggest source of migration risk entirely. Only change URLs when there is a clear reason, and redirect properly when you do.
Can I migrate a site myself?
A simple redesign on the same URLs is manageable with care. A platform change, new domain or URL restructure is where rankings most often get lost, so those are worth handling carefully, or having an experienced pair of hands oversee.
What should you monitor after a website migration?
Check Google Search Console daily for the first two weeks: look for 404 errors, crawl issues and drops in indexed pages. Compare organic traffic weekly against pre-migration benchmarks and act quickly on any problems found.
For the first few weeks, watch Google Search Console for crawl errors and coverage issues, keep an eye on your rankings and organic traffic, and fix any broken redirects quickly. A small, temporary dip as Google re-crawls is normal; a sustained drop means something needs attention. Catching issues early is the difference between a blip and a disaster.
Even a perfect migration can see a brief settling period as Google processes the changes. Done properly, rankings recover within days to a few weeks. Done without redirects and planning, they may not recover at all.
I handle migrations and redesigns with rankings protected, redirect mapping, testing and monitoring included as standard. Get in touch before you move, not after.
See web design servicesRelated services
Keep reading
- →WordPress Website Design, redesigns done without losing rankings
- →The Complete Local SEO Guide, protect and build your organic visibility
- →Why Fast Websites Win More Customers, keep speed up through a redesign
- →Website QA Testing, a pre-launch check that catches migration issues
Richard Barker has 20+ years of digital marketing experience. By day he leads digital marketing for a major UK IT solutions and services provider, a £2 billion IT solutions provider, building campaigns and websites for UK and international markets. Through Harrison Mann he applies that same strategic rigour to small and growing businesses.
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