Short answer: you maintain rankings by mapping all old URLs, redirecting them with 301 redirects to the correct new page, maintaining content and structure as much as possible, and monitoring performance closely after launch. The most common mistake is to change everything at the same time and forget the old links - then Google loses the pages.
Why do you lose rankings when you change your website?
Google has learned your current site: what pages are there, what they are about and how well they respond to searches. When you change websites, three things often change at the same time – the addresses (URLs), the content and the technical structure. If too much changes at once, Google loses its map of your site, and then visitors may stop finding you.
A URL is simply the web address of a specific page, for exampledittforetag.se/tjanster/webbdesign. If that address disappears or changes without you telling us where it went, both visitors and Google are met with an error page (404). Every such broken link is a small leak in your visibility.
What is a 301 redirect and why is it so important?
A 301 redirect is a technical way of saying: "this page has moved permanently here instead". When someone - a visitor or Google - tries to reach the old address, they are automatically forwarded to the new one. Think of it as a redelivery at Posten: the mail will arrive even if you have moved.
The 301 does two things. It ensures that visitors do not land on a wrong page, and it transfers most of the page's processed value in Google to the new address. Without 301 redirects, every page starts from scratch – and that's when rankings plummet.
Checklist: how to prepare the change
Do the work before launch, not after. Here is the order we follow at ZORC:
Map all old addresses.List every page that exists today. A tool like Screaming Frog or an export from Google Search Console will give you the full list.
Decide where each page should go.Do you keep the same address? Good. Does it change? Match the old address with the correct new page in a spreadsheet.
Keep content and headings.The text that ranks today should remain. Rewrite everything at once and you throw away what Google already likes.
Prepare all 301 redirects.One per old address that changes, pointed to the most relevant new page - not just the home page.
Save a copy of the old site.You want to be able to compare and debug afterwards.
What do I do on the actual launch day?
When the new site goes live, activate the redirects immediately. Then, on the same day, check that:
robots.txtdoes not block Google. A common mistake is that the development site had "block everything" turned on and that the setting is carried over to sharp operation.
yoursitemap(a file that lists all pages to the search engines) is updated and submitted to Google Search Console.
of the most important pagestitle and meta descriptionsremains.
the site loads quickly and works on mobile.
Google Search Console is Google's free tool where you can see how your site performs in the search results. It is your most important instrument during a shift.
How do I follow up after the launch?
The first few weeks are crucial. Keep an eye on four things: the number of 404 errors (should go towards zero), that the 301 redirects are pointing correctly, how the traffic is developing and whether Google is indexing the new pages. A small dip in traffic in the first few days is normal - Google needs time to read the site. But a sharp and persistent drop means something is wrong, usually a missed redirect or a block.
Also, wait to scrap the old site completely. Keep the redirects for at least six to twelve months, preferably longer. Other sites still link to your old addresses, and those links are valuable.
Common mistakes to avoid
To point all old pages to the home page.It signals to Google that the content is gone, and the value is lost.
To change the domain name, design and structure at the same time.Do one thing at a time if you can, it will make troubleshooting easier.
Forgetting the pictures.Even image URLs may need to be redirected.
Not measuring before the change.Without a "before" value, you don't know if something went wrong.
Do you want to change websites safely?
A website change is one of the few times where a small technical mistake can cost you months of visibility in Google. At ZORC, we build new websites with the SEO move built in from the start – we map, redirect and measure so that your rankings carry over to the new site. Do you want to know how your current site stands up to a change?Contact ZORC for a free review, and we will go through your situation together.
