When considering a dock project, google some version of the question:

“What does a seawall cost?”

The FAQs section on The City of Ft. Lauderdale’s website addresses the question as follows: “The City surveyed a number of seawall contractors
in May-June 2016. Seawall contractors quoted $650-$2,000 per linear foot, depending on the depth of the waterway and location of the seawall.
In addition, engineering and permitting services were quoted as $2,000- $5,000 per job… cost will vary by the type and condition of the seawall in question.”