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