Redesigns lose traffic for boring reasons. Not because the new site is worse, but because nobody wrote down what the old one had earned.
Start with an inventory, not a moodboard
Before anything is designed, export every URL on the current site with its traffic, its rankings and its inbound links. That list tells you which pages are assets and which are noise. Assets get migrated carefully. Noise gets retired deliberately.
Most businesses discover two or three pages they had forgotten about that bring in a quarter of their search traffic. Finding that out after launch is expensive.
Map every old URL to a new one
The single most common cause of a post-launch collapse is a missing redirect map. Every old address needs a permanent redirect to the closest equivalent new one, and a page that has no equivalent should redirect to its parent section rather than the homepage.
Check the map twice: once before launch on staging, once within an hour of going live, by crawling the old URL list and confirming every one lands somewhere sensible.
Keep the content that earned the rankings
Design refreshes often shorten copy to fit the new layout. Search engines read that as the page having less to say. If a page ranks, keep its substance and improve its structure instead, and let the design accommodate the content rather than the other way round.
Do not change the URL structure unless you have to
Changing slugs alongside a redesign doubles the risk and halves your ability to diagnose what went wrong. If the structure genuinely needs to change, do it as a separate, later project once the new design has settled.
Launch with measurement in place
Analytics, Search Console and conversion tracking should be live on the new site from the first minute, with the old numbers exported and saved. Without a baseline you cannot tell a seasonal dip from a self-inflicted one.
Watch the first three weeks
Expect a small wobble for a week or two while search engines re-crawl. What is not normal is a sharp drop in a single day, pages disappearing from the index, or a spike in not-found errors. All three usually point back to redirects.
If you want the inventory done properly before anything is designed, an SEO audit covers it, and the website redesign page explains how we run the migration itself.
