What is a substantial improvement?

A “substantial improvement” is any improvement or repair to your home the cost of which equals or exceeds fifty percent of the home’s market value. This means that if you undertake a substantial improvement, you will need to raise the lowest floor of your home to or above the height of where the 100 year flood is expected to rise.

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1. How do I know if my property is located in an SFHA?
2. What about basements and crawlspaces?
3. What are the special requirements that apply?
4. What is a Special Flood Hazard Area?
5. What is a substantial improvement?