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 building setbacks are established in the Unified Development Code (UDC), primarily Article 40, and vary by zoning district. Common residential districts and typical setback requirements: S (Suburban): 40 ft front, 15 ft side, 40 ft rear on lots 1 acre+; NC5: 25 ft front, 10 ft side, 30 ft rear; NC6a: 25 ft front, 10 ft side combined minimum, 30 ft rear; NC6b: 20 ft front, 5 ft side, 25 ft rear for smaller lots; NC10: 20 ft front, 5 ft side, 20 ft rear in compact patterns; NC21: urban infill with reduced setbacks. Commercial and mixed-use districts have different rules. Corner lots are treated as having two front yards, with a primary front yard along the longer street frontage and a secondary setback along the shorter. Accessory structures (sheds, detached garages) have reduced setbacks, typically 3 to 5 ft from side and rear lines if under 150 sq ft. Eaves and architectural features may project up to 2 ft into setbacks. Variances require application to the NCC Board of Adjustment (UDC Article 40, Section 30.300) with a public hearing. Pool decks, HVAC units, and generators have specific setback rules. Floodplain and riparian buffer setbacks (Brandywine Creek, Christina River, Red Clay Creek) add layers under the Chesapeake Bay and Coastal Zone protections.
Building within setback without approval: stop-work order. Correction required or variance application. Fines $250 to $2,000. Structures that cannot be brought into compliance may require removal at owner expense. Continuing violations: daily penalties.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Wilmington, DE
Residential swimming pools in Wilmington require a building permit from the Department of Licenses and Inspections and must comply with the Delaware State Bu...
Wilmington, DE
Delaware does not preempt local tiny-home rules, and Wilmington's City Code Chapter 48 (Zoning) treats dwellings under the standard residential district bulk...
Wilmington, DE
Carports in Wilmington are accessory structures regulated under City Code Chapter 48 (Zoning) and require a building permit from the Department of Licenses a...
Wilmington, DE
Wilmington follows Delaware HB 80 (2017) informal sanctuary protections. The Wilmington Police Department limits civil immigration cooperation with ICE; crim...
Wilmington, DE
Delaware's Healthy Delaware Families Act (DE 19 §3702A) created statewide paid family and medical leave, fully effective 2026. Wilmington cannot create a sep...
Wilmington, DE
Delaware preempts local minimum-wage rules. The state minimum wage rose from $13.25 (2025) to $15.00 effective 2026 under DE Title 19 §902, applying uniforml...
See how Wilmington's setback rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.