The Federal Emergency Management Agency (FEMA) advises against building in a floodplain. However, before you build, be sure to reach out to the Nassau County Building Department to see what the regulations are and what permits are required. Be aware of substantial improvement rules which are there to correct structures built before regulations or flood mapping. These apply when a structure is below a known base flood elevation plus freeboard.
For more information, contact the Building Department at (904) 530-6250 or email email@example.com.
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