| 1956 | Organized as Delaware Association of Consulting Engineers |
| July 10, 1963 | Voted to be a member of the American Consulting Engineers Council |
| October 16, 1970 | Incorporation of the Consulting Engineers Council of Delaware (CEC-DE) |
| 1971 | CEC-DE joined the Delaware Council of Engineering Societies |
| July 7, 1972 | Governor Russell W. Peterson signed House Bill 894 creating the Delaware Association of Professional Engineers (DAPE). CEC-DE was a sponsor of this legislation. Each registered Professional Engineer residing in Delaware has a voice in the regulation of engineering in Delaware |
| 2002 | Membership voted to change the name from CEC-DE to The American Council of Engineering Companies of Delaware to further strengthen the Organization. |
