FEMA flood zone rules in New Castle County, DE — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Significant portions of New Castle County lie within FEMA-designated flood zones along the Christina River, Brandywine Creek, Red Clay Creek, and Delaware River. Floodplain permits are required for development in these areas.
New Castle County participates in NFIP and enforces floodplain management regulations. Properties in Special Flood Hazard Areas (SFHA) require flood insurance when federally backed mortgages are involved. New construction and substantial improvements must elevate above the Base Flood Elevation (BFE). Ordinance 22-030 (April 2022) updated the county's drainage code to reduce flooding from legacy development. Ordinance 24-059 (September 2024) also requires floodplain permits for fences in floodplain areas. The Dept. of Land Use administers floodplain regulations.
Building in flood zones without required permits can result in loss of NFIP eligibility and code enforcement action.
New Castle County, DE
New Castle County permits gas and electric leaf blower use with no statewide or county ban. Operation hours align with the county noise ordinance (NCC Code C...
New Castle County, DE
Amplified sound in unincorporated New Castle County is regulated under NCC Code Chapter 22 (noise) and the county's special event permit process. Sound must ...
New Castle County, DE
Wilmington restricts overnight on-street parking 2 AM to 6 AM in posted zones and requires residential permits in many neighborhoods. Unincorporated New Cast...
New Castle County, DE
New Castle County requires electrical permits for Level 2 EV chargers. Delaware law (26 Del. C. §1018) preempts HOA bans on EV chargers. Public stations must...
New Castle County, DE
New Castle County requires a building permit for retaining walls over 4 feet measured from bottom of footing to top of wall. Walls supporting surcharge loads...
New Castle County, DE
New Castle County regulates fence materials through the Unified Development Code (UDC), primarily Article 40 (zoning). Wood, vinyl, composite, wrought iron, ...
See how New Castle County's flood zones rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.