Sarasota has more Zone VE than the markets to the south, and VE is a different building problem from AE. VE applies to Gulf-front land subject to wave action as well as flooding - the Gulf sides of Siesta Key, Lido Key, Longboat Key and Casey Key. In a VE zone you generally cannot build on fill; the home sits on an open foundation designed for wave loads, with the lowest structural member above Base Flood Elevation rather than just the floor. That is a structural decision made at the first drawing, and it drives cost more than any finish selection will.
Inland, most of the developed county sits in AE or X, with Base Flood Elevations that vary lot by lot rather than by neighborhood.
Sarasota County holds a CRS Class 5 rating under FEMA's Community Rating System, earning a 25% discount on NFIP flood insurance for properties in Special Flood Hazard Areas and a smaller discount outside them. The county has participated since 1992. But the municipalities carry their own classifications - the Town of Longboat Key, for instance, has sat at a lower class with a smaller discount. Two homes a short drive apart, same water, different annual premium.
Two elevation certificates are required during construction, not one: an "under construction" certificate before the lintel is poured, and a final certificate before your last inspection, which is what your insurer uses to set your rate.
If a structure is already on the parcel, ask about substantial damage determinations before you budget anything. Helene and Milton produced a significant number of them on the barrier islands, and a substantially damaged home has to be rebuilt to current standards including elevation - which changes a renovation into a rebuild. Establishing what was determined, and what was permitted, is work James does as a consultant and as a retained expert witness, and it belongs before an offer.
You can check any lot yourself at FEMA's Flood Map Service Center.