A redesign is worth the SEO risk when it solves a real problem bigger than the temporary ranking volatility it creates, and it is not worth it when the motive is cosmetic. The pivot is real-problem versus fresh-look. If the current site genuinely fails users or the business, and fixing that delivers a gain that outweighs the dip you will pass through, the risk is justified. If the site works and you simply want it to look newer, you are gambling hard-won rankings for little real upside, which is rarely a good trade.

The reason a redesign carries SEO risk at all is that a real redesign usually changes the things rankings depend on, URL structures, templates, content layout, internal linking, and speed, and changing those forces Google to reprocess the site, with a settling period and possible dip while it does. That cost is acceptable when the problem you are solving is large. A site that frustrates users, fails on mobile, buries conversions, loads slowly, or no longer serves the business is leaking value continuously; a redesign that fixes those leaks can return more than the temporary volatility takes. The gain is structural and lasting, the risk is temporary, so the math favors the change.

It tips the other way for cosmetic refreshes. Restyling a site that already performs, purely for a more modern look, puts established rankings on the line for an upside that does not move users or revenue much. The volatility is the same kind, but there is no real problem on the other side of the scale to justify it. That is the case where the redesign instinct, chasing a fresh look while ignoring SEO, costs more than it returns.

Before committing, name the real problem the redesign solves and weigh that gain against the ranking risk and recovery time. If the problem is genuine and the payoff clears the risk, proceed, and plan the redesign to preserve URLs, content, internal links, and speed so you carry your SEO through the change. If the only driver is appearance, hold off or scope it so it does not disturb what is already ranking.