Hilton Head Island
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When the cost to repair any damaged structure to its previous condition would equal or exceed 50% of the market value of the structure before the damage occurred.
When the cost of any reconstruction, rehabilitation, addition, or other improvement of a structure would equal or exceed 50% of the market value of the structure before "start of construction". This term includes structures which have incurred "substantial damage" regardless of the actual repair work performed.
The Town of Hilton Head Island has the responsibility to determine "substantial-damage" and "substantial improvement" using the following procedures:
Existing buildings that are deemed substantially damaged or improved must be brought to compliance with the current building code to include being elevated to the base flood elevation plus one foot.