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