If you need to make changes to your logo, marketing materials, or website (or all of the above), then consider evolving it slightly instead of throwing everything you have out and starting over again.

Evolving your designs will allow you to retain the visual history that you've developed while still refreshing your brand. And that can be valuable – to enable you to 

Also, evolving your designs will probably be less of a cost- and time-hit than it would take to redesign everything from scratch. And what small business doesn't like that?

Of course, if your designs really aren't working for your business, then you may want to consider redesigning – just consider also whether evolving them may work for you.