A website redesign is one of the few projects where good design work can still tank your SEO if the technical side is handled carelessly. The design itself rarely hurts rankings — what hurts rankings is what happens to your URLs, your content, and your existing backlinks during the switch.
Map your URLs before you touch anything
If your new site changes any URL structure — even something as small as adding or removing a trailing slash pattern — every old URL needs a 301 redirect pointing to its new equivalent. Skipping this is the single most common reason a redesign tanks traffic: search engines and any site linking to you are still pointing at pages that now return a 404.
Don't drop content that's already ranking
It's tempting to use a redesign as an excuse to "clean up" old blog posts or service pages. Before deleting anything, check whether it's actually bringing in search traffic. A plain-looking page from three years ago that quietly ranks for a valuable keyword is worth redesigning, not deleting.
Keep your metadata intact
Page titles and meta descriptions that are already working shouldn't be rewritten just because the design changed. If you are updating them, do it deliberately and track what changed, so if rankings dip afterward you can tell whether it was the redesign or the copy change.
Launch on a staging environment first
Every redesign we do gets tested on a staging URL before it goes live, specifically so redirects, forms, and page speed can be checked with real data before real visitors and search engines see it. A redesign is a good moment to fix technical debt — it's a bad moment to introduce new problems you haven't tested for.