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