County Laws & Code

Complete County Code
The complete county code is maintained by Municipal Code Corporation, the nation's leading codifier.

This online document is updated bimonthly. In order to keep pace with changes to Chapter 40 of the county Code, an up to date copy of this chapter is made available below. Also, selected chapters are available below in PDF format.

Unified Development Code
Chapter 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.

The code regulates and controls the following:
  • Creation and administration of zoning districts
  • General development of real estate in the unincorporated areas of New Castle County
  • Planning and subdivision of lands
  • Use, bulk, design and location of land and buildings
Subdivision and Land Development (SLD) Review and Approval Process Prior to January 1, 2010.

Building Code
New Castle County is currently enforcing the following codes:
  • 2003 ANSI
  • 2006 International Building Code
  • 2006 International Residential Code
  • 2009 International Mechanical Code
  • 2009 International Fuel Gas Code
  • 2009 International Plumbing Code
  • 2009 International Energy Conservation Code
Chapter 6 of the New Castle County Code and its appendices contain amendments to the international codes and is available for download. Copies of the ICC Codes can be purchased from the Department of Land Use.

Property Maintenance Code
Chapter 7 of the New Castle County code deals with property maintenance and enforcement.