While you don't want to change your brand frequently, guest Amanda Guerassio suggests there are signs you are ready for a refresh.  

1. If you designed your logo yourself when you started your business, and the branding suite just isn't as professional as you would like
2. Your business has changed direction or target and the design suite no longer reflects you company
3. The brand relied on "trendy" colors, fonts or styles that were cool when the brand was launched but is somewhat dated now.