Direct Answer
To hire a reliable commercial glass & curtain wall installation contractor in Trenton: (1) Get 3 written quotes with line-item breakdowns, (2) Verify NJ license at New Jersey Division of Consumer Affairs (njconsumeraffairs.gov), (3) Confirm active general liability and workers' comp insurance, (4) Check Google and BBB reviews specific to Trenton projects, (5) Never pay more than 10-30% upfront — never pay in full before completion.
Full Explanation
Red flags specific to Trenton contractors: no physical Trenton-area address, pressure to start immediately, cash-only payment demands, and license numbers that don't verify at New Jersey Division of Consumer Affairs (njconsumeraffairs.gov). Seasonal demand during summer brings out less reputable contractors.
Local Factors in Trenton
📍Verify license: New Jersey Division of Consumer Affairs (njconsumeraffairs.gov)
📍File complaints: New Jersey Division of Consumer Affairs (njconsumeraffairs.gov)
📍Homeowner protections under NJ consumer protection law
📍BBB Greater Trenton chapter for complaints history