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