New Castle County, DE Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in New Castle County, DE, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Rear/side setback
- At least 3 feet from lot lines
- Max height
- 20 feet for accessory structures
- Permit exemption
- Free-standing, prefab, 200 sq ft or less
- Garage trigger
- Enclosed on fewer than 2 sides
- Scope
- Unincorporated county only, not Wilmington/Newark
Summary
Carports count as freestanding accessory structures under the Unified Development Code: they're barred from front, street, and side yard setbacks, must clear rear and side lot lines by at least 3 feet, and are capped at 20 feet in height.
A.General standards. Unless otherwise provided in Subsections B. through M. of this Section, all accessory structures (e.g., detached garages, sheds, pergolas, and similar structures) shall meet the following standards:...2.Freestanding accessory structures shall not be located in any side yard setback or any required bufferyard.3.Freestanding accessory structures may be located in the rear yard provided any such structure is located at least three (3) feet from the side lot line and rear lot line....7.No freestanding accessory structure shall exceed twenty (20) feet in height.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 5).
Full Breakdown
New Castle County treats a carport as a freestanding accessory structure under UDC Section 40.03.410: it cannot stand in a front or street yard setback, cannot sit in any side yard setback, and in the rear yard must clear the side and rear lot lines by at least 3 feet, with a 20-foot height cap. Separately, a free-standing, pre-fabricated carport of 200 square feet or less serving a one- or two-family home doesn't need a building permit (Sec. 6.03.012.C.2.c), but one open on fewer than two sides counts as a garage and loses the exemption. Both chapters apply to unincorporated New Castle County only; Wilmington and Newark enforce their own codes.
Violations & Fines
Unpermitted or setback-violating carports are enforced by the Code Official and Department of Land Use, and are subject to stop-work orders, permit revocation, and civil penalties under the Building Code and Unified Development Code.
Frequently Asked Questions
Do I need a permit to build a carport in New Castle County?
How close to my property line can a carport sit?
Does this rule apply inside Wilmington or Newark?
Sources & Official References
Other rules in New Castle County
How New Castle County compares: Shed Permit Requirements by City·Compare New Castle County to another location·View the Delaware accessory structures overview
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