Wilmington Manor Zoning Overview

Wilmington Manor is an unincorporated community in New Castle County, Delaware, with a population of approximately 8,200. Despite its name, Wilmington Manor is distinct from the incorporated City of Wilmington — it has no municipal government of its own. All zoning, land use regulation, and building permits are administered by the New Castle County Department of Land Use under the county's Unified Development Code (UDC), Chapter 40.

• Planning Authority: New Castle County Department of Land Use
• Phone: (302) 395-5400
• Address: 87 Reads Way, New Castle, DE 19720
• Zoning Map: New Castle County ArcGIS viewer
• Unified Development Code: czo.nccde.org

Zoning Districts

Wilmington Manor falls under the New Castle County Unified Development Code (UDC). The area is typically zoned NC (Neighborhood Conservation) and TN (Traditional Neighborhood), reflecting its older established residential neighborhoods and their proximity to the City of Wilmington. The full range of county zoning districts includes additional residential types (S, SE, SR, MM), office districts (ON, OR), commercial districts (CN, CR), business park (BP), and industrial (I). Overlay districts for historic areas (H) and hometown character (HT) may also apply.

Dimensional standards — including minimum lot sizes, setbacks, and height limits — are found in UDC Table 40.04.110. The county also publishes a dimensional standards summary document at newcastlede.gov.

Note on setbacks: Specific setback dimensions for each district are provided in UDC Table 40.04.110. Contact the New Castle County Department of Land Use at (302) 395-5400 to confirm requirements for your property.

ADU Rules

New Castle County permits 1 ADU per single-family lot, subject to these requirements (as of Ordinance 24-087, effective September 2024):

• Owner-occupancy of the primary residence is required
• Detached ADUs require a minimum lot size of 0.5 acres
• Delaware SB 23 (effective April 1, 2024) limits local restrictions on ADUs statewide

Contact the New Castle County Department of Land Use at (302) 395-5400 for current permit requirements and procedures before planning an ADU.

Development Process

Because Wilmington Manor is unincorporated, all development approvals go through New Castle County:

1. Zoning Verification — Confirm your property's zoning district using the county zoning map or by calling (302) 395-5400
2. Land Use Application — Submit development applications to the New Castle County Department of Land Use
3. Building Permit — Obtain a county building permit before construction
4. Inspections — Schedule required county inspections during construction
5. Certificate of Occupancy — Obtain final county approval before occupying

Variances and special exceptions are reviewed by the New Castle County Board of Adjustment.

Key Considerations

• Wilmington Manor has no municipal government — all land use authority is with New Castle County; do not confuse it with the incorporated City of Wilmington
• The area is typically NC and TN zoned — verify your specific parcel on the county zoning map
• Check for FEMA flood zones at msc.fema.gov
• HOA covenants and deed restrictions may impose additional requirements beyond county zoning
• ADU rules changed in September 2024 (Ordinance 24-087) — confirm current requirements with the county

Disclaimer: This guide provides general information about zoning in Wilmington Manor, Delaware and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations directly with the New Castle County Department of Land Use or the Unified Development Code before making development decisions.