A redesign can gain, or lose, a great deal
Redesigning a website is often necessary: an ageing design, weak content, poor performance, an offer that has evolved, outdated technology. But a poorly prepared redesign can cause visibility to collapse: deleted URLs, forgotten redirects, shortened content, altered tags, broken internal linking.
Search engine optimisation should therefore not be dealt with after launch. It must be part of the redesign plan from the very beginning.
What real-world redesigns reveal
In practice, redesigns fall broadly into three scenarios. Some are fully under control: traffic loss remains minimal and the site recovers its level within a few weeks, sometimes even exceeding it thanks to the improvements made. Many experience a temporary, normal dip followed by a gradual recovery over one to two months. Finally, a minority suffer a lasting loss, with a significant drop that takes many months to recover, if it recovers at all.
What separates these three outcomes is no mystery: it mostly comes down to two things, the quality of the redirect plan and the rigour of the go-live protocol. A site that approaches its redesign with a full prior audit, an exhaustive redirect plan and close monitoring during the first weeks keeps most of its organic traffic. A slight dip in the first few days is normal; a drop of 30% or more, on the other hand, signals a serious problem to fix without delay.
What redirect chains really cost
A properly configured 301 redirect passes on most of the "link equity" (the authority the page has built up) to its destination, provided it is direct. The problem arises when an old URL redirects to another URL that is itself already redirected, creating a chain: each extra hop dilutes the authority passed on a little more and adds to loading time. Google recommends never going beyond three hops, the ideal being a direct redirect from the old URL to its final destination, with no intermediate step.
This point is particularly neglected during successive redesigns: a site that has been through several redesigns over the years often accumulates inherited redirect chains (URL A to B during the redesign before last, then B to C during the previous one), without anyone having cleaned up the path. A redesign audit should systematically check and fix these historical chains, not just create clean new redirects for the current change.
Before the redesign: take stock of what exists
Start by listing the current pages: URL, traffic, impressions, keywords, backlinks, conversions and commercial role. Some pages with little visibility can be removed; others, even imperfect ones, have SEO or commercial value worth preserving.
To prepare before designing the new site:
an export of indexed URLs;
the pages that generate traffic or enquiries;
content to keep, merge, rewrite or remove;
the 301 redirects to plan;
priority keywords and search intents;
the future structure of service pages and articles;
an internal linking plan.
During the redesign: build it properly
The new site must keep a clear structure: one page per major offer, consistent titles, unique descriptions, sufficiently complete content and logical internal linking. Performance must also be monitored: images, videos, fonts, JavaScript and mobile rendering can all affect the experience.
Design must not erase substance. A beautiful page with three vague sentences can convert less well than a simpler but clearer one. A redesign is an opportunity to strengthen content, not just to change the shop front.
At launch
Check that all important redirects work.
Test forms, call booking and calls to action.
Check 404 pages.
Submit the sitemap in Google Search Console.
Check title tags and meta descriptions.
Check that important pages are indexed.
Monitor errors over the following 30 days, the period industry studies identify as the most critical.
After the redesign: measure and correct
A temporary drop of around 10% can happen after a redesign, but it must remain limited and be monitored. Compare impressions, clicks, positions and conversions with the old site. If a strategic page falls beyond that threshold, look first at redirects, content, the intent covered and internal linking: these are the causes behind the vast majority of failed redesigns.
A successful redesign is one that improves the site without breaking what already worked. It is also a chance to clean up weak pages, improve content and align the site with the business's commercial reality.
A simplified redirect plan, by example
For a product or service page whose URL changes during the redesign (for example /our-services/shop becoming /services/online-shop-creation), the redirect plan maps each old URL to its exact new destination, never to the home page by default. A blanket redirect to the home page for every old URL is one of the most common mistakes: it breaks the link between the content Google had indexed and its new version, and deprives the target page of the SEO equity built up by the old URL.
Rebuild everything? Rarely
During a redesign, the temptation is to start from a blank page: new site structure, new URLs, new organisation. Yet this is one of the most frequent causes of failure. Changing a site's architecture without clear logic, breaking URLs that worked and an organisation Google had understood along the way, amounts to throwing away accumulated SEO equity instead of passing it on.
If the current structure does its job, it is better to evolve it than to rebuild it. Keep what works, fix what is not working, add what is missing. A redesign does not need to be a clean slate to be ambitious: the best redesigns keep most of the existing structure while clearly improving content, design and performance.
A team effort, not silos
The other major cause of failure is organisational: a lack of coordination between those who build the site and those who manage its visibility. When the technical team rebuilds the site on its own and SEO is consulted afterwards, it is often too late: URLs have already changed, redirects have been forgotten, the structure is fixed.
A successful redesign brings both areas of expertise together from start to finish. The developer and the SEO specialist do not work one after the other but side by side: the inventory of pages to preserve, the redirect plan, the structure of the new pages and the switchover schedule are decided jointly. This coordination, more than any tool, makes the difference between a redesign that moves the site forward and one that breaks it.
Prepare rather than repair
A redesign is a high-risk, high-potential moment: well prepared, it takes a website up a level; improvised, it destroys overnight what years of SEO work had built. Everything is decided upstream, in the inventory of existing pages, the redirect plan and team coordination, then in monitoring during the first weeks. SEO cannot be recovered after the fact; it has to be protected from the very first scoping meeting.
We can support you with a website redesign that includes redirects and technical SEO. Website creation remains intended for new projects. Contact us to secure your project.
Sources: Google Search Central, site moves with URL changes · App Mobile Normandie, website migration 2026 (in French)