How to tell if your website needs a redesign
A redesign is not the first answer. It is the answer when the structure can no longer carry the message.
A rebuild makes sense if the site cannot be edited, if mobile is a broken version of desktop, or if every new change breaks something else.
An improvement is enough when the issue is the headline, the section order, the speed, or a hidden contact path.
The useful question is not “does it look old?”. It is “can a stranger understand what to do in under a minute?”.