Web redesign without losing SEO: step-by-step migration checklist

A website can be redesigned without losing its ranking, but only if each old URL has a clear destination before launch. Most traffic drops after a redesign don't come from the new design. They come from pages that change their address without redirection, from content that disappears, and from a sitemap that no one updates.

This is the list that we follow in each migration, organized in the same order in which work is done.

Before touching anything: the inventory of URLs

The redesign starts with a spreadsheet, not Figma. You need to know what you have and what brings you visitors today.

• All indexable URLs. Remove them from the current sitemap and from a full crawl of the web. Cross-check both lists: often there are pages that weren't in the sitemap but do receive traffic.
• The pages that bring clicks. In Google Search Console, under Performance, export the pages from the last 12 months. Those are the ones you can't afford to break.
• The pages that receive external links. An old article with links from other media is worth more than what its visits say.
• The current titles and meta descriptions. If a page ranks well, its title is part of the work. Save it before rewriting it.

With that list, they mark each URL with one of three decisions: it remains the same, it moves to another address, or it disappears.

The map of redirections

Every URL that changes or disappears needs a permanent redirect to the most similar new page. Google recommends permanent server-side redirects, i.e. 301 or 308, and not temporary ones, because they are the ones that transfer the signals from the old page to the new one.

Situation	What to do
The page is maintained with another URL	301 from the old URL to the new one
Two pages merge into one	301 from both to the resulting page
The page disappears, but there is an equivalent.	301 to the nearest equivalent, not to the cover
The page disappears without a replacement	Let it return 404 or 410, without forcing a redirect

The most common mistake is to redirect everything to the home page. Google usually treats those massive redirections to the home page as unfound pages, so the value of the old page is also lost.

Another detail that gets forgotten: the chains. If URL A already redirected to B and now B redirects to C, update the A redirect so that it goes directly to C.

During development

• Blocks the testing environment. The website under construction should be password protected or marked as non-indexable. A staged copy of the index is competing with your own website.
• It retains the content that it positions. A redesign is a good time to improve the text, but if a page is in the first position, change the structure carefully and keep the topics covered.
• One H1 per page, Titles of less than 60 characters and a unique meta description on each new page.
• Canonical tag that points to the actual URL on each page. If the website has multiple languages, check the hreflang tags as well.
• Alternative text in the images. In a migration, hundreds of new images are uploaded and it is easy for all of them to be left without a description.

If you want to review the technical points one by one, we have a Technical SEO checklist before launching a website which is equally useful for a new website and for a redesign.

The day of the launch

1. Remove the indexing lock. In WordPress, check in Settings, Reading, that the option that prevents search engines from indexing is unchecked. This is the most expensive and easiest mistake to overlook.
2. Enables the redirections and test a sample of old URLs, starting with the ones that had the most clicks.
3. Update the internal links. Menus, footers, and links within the text should point to the new URLs, not depend on the redirection.
4. Send the new sitemap in Search Console so that Google can discover new addresses sooner.
5. Check the robots.txt to confirm that it does not block sections that you want to index.

If you also change your domain, Search Console has a change of address tool. In that case, all you need to do is to switch from http to https or from www to without www within the same domain; you don't need it for that.

The following weeks

It is normal to see movement in positions after a migration. According to Google documentation, on a medium-sized website it can take a few weeks or more for the results to show the new URLs instead of the old ones. The important thing is to distinguish a normal fluctuation from a real problem.

• Week 1. Check Search Console for the new 404 errors. Every old URL that appears there is a missing redirect.
• Weeks 2 to 4. Compare the pages with more clicks before and after. If a specific page falls and doesn't recover, check its redirection, its title, and whether the new content covers the same content as the old one.
• Month 2 onwards. Check in the indexing report that the number of indexed pages is stabilizing and that the old URLs are being removed.

Redirections are not removed when traffic returns. Google recommends keeping them for as long as possible, usually at least a year, and it is generally wise not to remove them ever.

Frequently asked questions

Can I change the design without changing the URLs?

Yes, and it is the safest option. If the address structure remains the same, the SEO risk of a redesign is greatly reduced. Changing URLs is only worth doing when the current structure is a real problem.

How much traffic is lost in a redesign?

With a complete redirect map, a temporary fluctuation is usually the norm and not a loss. Strong and lasting drops almost always have a specific cause that can be found in Search Console.

Do redirects slow down the website?

A redirect adds a minimum jump. The problem is the chains of several consecutive redirects; that’s why it’s advisable for each old URL to go directly to its final destination.

How we work on it

At Wittierra Design the web design and the SEO optimisation They are planned together from day one, so the URL inventory and the redirect map are part of the project, not a later patch.

If you are considering a redesign, you might be interested to know how much does a website cost in Barcelona o How long does SEO take to produce results?. And if you prefer that we review your case, write to us.