I have a general contracting company based here in Washington State that I started back in November of 2005. We are changing our focus from handyman services to larger residential construction jobs. Along with a change of focus we would like to change the name of our entity. Can we change the name of our company with out losing the "official incorporation date" listed in the WA ST bureau of Labor and Industries data base. Or, is a DBA a more suitable idea? The main idea is that when potential customers research our company, we want them to see we have been doing business for a better half of a decade.