2 rules for unincorporated New Castle County, Delaware.
Verified from official government sources
New Castle County regulates outdoor lighting under UDC Article 40 lighting standards, requiring full-cutoff fixtures for new commercial and multifamily development. Residential dark-sky rules are limited; light trespass onto neighbors is addressed through nuisance provisions. Full International Dark-Sky Association certification is not adopted countywide. Wilmington has separate municipal lighting rules.
New Castle County UDC Article 5 requires exterior lighting to be shielded and directed onto the property. Light trespass onto adjacent residential lots is prohibited, with 0.1 foot-candle maximum at residential property lines.
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