3 rules for unincorporated New Castle County, Delaware.
Verified from official government sources
New Castle County sets building setbacks through the Unified Development Code (UDC) Article 40. Setbacks vary by zoning district: NC5 (typically 25 ft front, 5 ft side, 30 ft rear), NC6a/NC6b (smaller lots with proportional reductions), and S (Suburban) with larger setbacks. Corner lots have dual front yards. Variances go to the NCC Board of Adjustment.
New Castle County sets building height limits by zoning district under UDC Article 40. Residential districts typically allow 35 ft or 2.5 stories for single-family homes. Commercial and mixed-use districts allow 45 to 75+ ft depending on location. Height measured from average finished grade. Chimneys, antennas, and mechanical screens have limited exceptions. Airport approach zones near ILG and Summit add FAA Part 77 restrictions.
New Castle County limits lot coverage through UDC Article 40 and associated stormwater regulations. Residential districts typically allow 30 to 50% building coverage and 60 to 70% total impervious coverage. Lots exceeding coverage thresholds must provide additional stormwater management. Floodplain and sediment-and-stormwater rules (7 Del.C. §4001 et seq.) add requirements on large additions.
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