If the house is not in a flood zone, piers will not decrease your insurance premium.
Florida is the nations #1 location for home insurance rates that double that of the #2 state. Home insurance rates in Florida is a BIG deal. The average home insurance premium for the entire state is $2,014 annually.
Now. be advised, EVERYTHING matters regarding what you will pay for home insurance including the contents of your CLUE report (it's like your FICO score but used by insurance companies, who ALSO use your FICO score)
If the home is located with a big water view of the Gulf of Mexico, the piers will need to elevate the home above Base Flood Elevation (about 17 feet in Pinellas County) Further more the ground level must be specially constructed to allow surge water to pass through, otherwise you have a really tall house boat.
The real advantage to being on piers and not in a flood place is the easy of making house modifications.
Florida real estate professionals have done this so many times we can make a list of the features that could reduce your insurance rate. That list will be longer than a Staples receipt.
Best of success,
Annette Lawrence, Broker/Associate
Palm Harbor, FL