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1. I'd like to build an addition to my home that has a historic exemption. Would the addition be exempt as well?

View the following list that explains what will and will not be considered as an exemption:

• If the cost of the addition will be less than 50% of value of the existing building, then the addition is exempt.
• If the cost of the addition represents 50% or more of the value of the existing building, then the addition isn’t exempt and elevation is required.
• If the existing building will be renovated as well, then the total cost of both the renovations and new construction are included in the 50% threshold calculations.
  • If this combined value is 50% or more, then the addition must be elevated, but the original building isn’t required to be elevated. The 50% calculations are cumulative for a five year period.
    • For example, if the existing house was remodeled three years ago to 30% of it’s value, and now the new addition would represent 25% of the existing building’s value prior to the addition, then the addition must be elevated (30% plus 25% equals 55%).
  • The same rule applies whether the buildings are connected or not. Unless a variance has been granted allowing an additional living unit on the lot.
• When a historic contributing structure is moved or the foundation replaced, elevation of the building is required.
• For more information on the 50% rule, view Substantial Improvement.

2. My building enjoys a historic exemption or is located in the historic district. I'm not required to elevate it, but I want to. Is this permitted?

Yes, to some degree. Any building governed by the Historic Architectural Review Commission (HARC) may be elevated to the Base Flood Elevation (BFE). Raising it higher would require HARC approval. Additionally, there may be building height limits that might apply. View the Elevation/Freeboard page for more information.