Re-Zoning Video Opens in new windowNew Castle County’s Comprehensive Plan estimates future conditions and, at least every 10 years, the Plan and its corresponding Zoning Code may be adjusted in response to changing conditions and circumstances. In such cases, re-zoning of County land may be necessary due to new economic conditions that render a specific land use infeasible or technologically obsolete and/or shifting community needs and priorities. Accordingly, New Castle County employs a 7-step re-zoning process that is described in this brief animated video: New Castle County Re-Zoning Explained

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General Information

Unified Development Code

ChapteCover Page from New UDC (Updated) Print Opens in new windowr 40 of the county Code is the primary guide to development within New Castle County. 

The Unified Development Code (UDC) establishes standards, procedures, and minimum requirements, consistent with the Comprehensive Development Plan.  A searchable online version of the UDC is available at: Unified Development Code Online.

A PDF version of the complete UDC is also available at Unified Development Code (Revised 7/16/18) or by clicking the cover graphic on the left.

Zoning Maps

Zoning maps are used to determine the applicable zoning for areas within New Castle County. There are a variety of zoning districts in New Castle County which fall into these general categories:


  • TN (Traditional Neighborhood)


  • ST (Suburban Transition) - residential
  • MM (Manufactured Mobile Home) - residential
  • ON (Office Neighborhood) - lower density/scale office development
  • OR (Office Regional) - higher density/scale office development
  • CR (Commercial Regional) - higher density/scale commercial development
  • BP (Business Park)
  • I (Industrial)


  • CN (Commercial Neighborhood) - lower density/scale commercial development
  • S (Suburban) - residential
  • SE (Suburban Estate) - residential, no sewer services
  • SR (Suburban Reserve) - residential, farmland, future sewer and water service planned)


  • NC (Neighborhood Conservation) - residential, existing developments, numbers following denote lot size or type of residential development (e.g., NC10 indicates Neighborhood Conservation with minimum 10,000 square foot lot size; NCAP indicates Neighborhood Conservation with apartments
  • HI (Heavy Industry)
  • EX (Extraction)
  • H (Historic Overlay) - applies additional standards to the base zoning
  • HT (Hometown Overlay) - standards specific to the particular district