5 county-level rules, plus city-specific rules for 1 city in New Castle County, Delaware.
Verified from official government sources
Accessory dwelling units (ADUs) in New Castle County require both zoning and building permits. Attached ADUs and some garage conversions may be permissible in residential zones under UDC Chapter 40.
Sheds and outbuildings in New Castle County are accessory uses under UDC Section 40.03.410. They cannot be used for habitation and must meet setback requirements. Permits are required for larger structures.
Converting a garage to living space in New Castle County requires building and zoning permits. The converted space must meet habitability standards including egress, HVAC, and electrical requirements.
New Castle County requires building permits for carports. UDC setbacks apply: typically 5 feet side/rear in residential zones. Maximum height 15 feet for detached carports. Lot coverage caps vary by zoning district.
New Castle County treats foundation-built tiny homes as dwellings meeting IRC Appendix Q (minimum 120 sq ft habitable). Tiny homes on wheels are classified as RVs, not permitted as primary dwellings outside RV parks.
1 cities in New Castle County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for New Castle County — parking, noise, fences, fires, animals, pools, and more.
New Castle County Ordinance Hub →