Wilmington is a moderate-high cost-of-living market — pricing guide and permit rules below.
Wilmington plumbing rates: $90-$170/hr. Always get 3 written quotes and verify DE licensing at Delaware Revenue (revenue.delaware.gov). Sales tax on materials: 0%.
Wilmington requires permits when work exceeds $25,000 or involves full system replacement. Your licensed contractor pulls the permit — if they ask you to pull it, that's a red flag.