Setback Regulations: Setback regulations are in place to determine the distance between a property's building or structure and the shoreline. These regulations aim to protect the coastal environment, preserve public access, and mitigate the risks associated with erosion, flooding, and other coastal hazards. Setbacks are measured from the certified shoreline, which is typically determined by state or county authorities.

1. Varying Setback Requirements: The setback requirements can vary based on factors such as location, zoning, and specific county regulations. In general, setback distances are larger in high-risk erosion areas or regions prone to coastal hazards. These setback requirements may apply not only to the ocean side of a property but also to the sides and rear to ensure adequate space for access, views, and protection of neighboring properties.

2. Erosion Zones: Hawaii recognizes different erosion zones that classify areas based on their vulnerability to erosion. These zones, such as the Coastal High Hazard Area (CHHA) and Special Management Area (SMA), have specific setback requirements and stricter regulations due to the increased risks associated with erosion. The setback distances may increase in erosion-prone zones to allow for future erosion and coastal change.

3. Shoreline Certification: The state or county authorities are responsible for certifying the shoreline, which is used as a reference point for determining setback distances. Shoreline certifications can change over time due to natural processes like erosion or accretion. Property owners should consult the relevant authorities or obtain a survey to confirm the certified shoreline and ensure compliance with setback requirements.

4. Variance and Exemptions: In some cases, property owners may seek variances or exemptions from setback requirements if they can demonstrate unique circumstances or hardships. The variance process involves presenting evidence to the appropriate authorities, showcasing the property's characteristics, and justifying the need for a deviation from the standard setback requirements. Variances are typically granted on a case-by-case basis and may require public hearings and community input.

It's crucial for property owners and potential buyers of oceanfront properties in Hawaii to be aware of setback regulations and consult with local authorities, planning departments, or qualified professionals to understand the specific setback requirements applicable to their property. Understanding these regulations is essential to ensure compliance, protect the coastal environment, and maintain the long-term integrity and value of the property.

Remember that setback requirements may change over time due to updates in coastal management plans or evolving environmental conditions. Staying informed and working with experienced professionals can help navigate the setback regulations effectively and ensure the responsible development and enjoyment of oceanfront properties in Hawaii.

See here for specific information on Hawaii State Sea Rise impacts maps etc.