To hire a reliable window replacement contractor in Wilmington: (1) Get 3 written quotes with line-item breakdowns, (2) Verify DE license at Delaware Division of Revenue Contractor Registration (revenue.delaware.gov), (3) Confirm active general liability and workers' comp insurance, (4) Check Google and BBB reviews specific to Wilmington projects, (5) Never pay more than 10-30% upfront — never pay in full before completion.
Full Explanation
Red flags specific to Wilmington contractors: no physical Wilmington-area address, pressure to start immediately, cash-only payment demands, and license numbers that don't verify at Delaware Division of Revenue Contractor Registration (revenue.delaware.gov). Seasonal demand during summer brings out less reputable contractors.