Direct Answer
The best commercial glass & curtain wall installation contractors in Cambridge are verified through Massachusetts Office of Consumer Affairs (mass.gov/orr). Look for companies with 4.5+ Google stars, 50+ reviews, active MA license, and at least 5 years serving the Cambridge area.
Full Explanation
Verify any Cambridge contractor at Massachusetts Office of Consumer Affairs (mass.gov/orr). Request proof of general liability insurance and workers' compensation. Ask for references from recent Cambridge projects — local experience matters for understanding permit requirements and area-specific challenges.
Local Factors in Cambridge
📍Verify license: Massachusetts Office of Consumer Affairs (mass.gov/orr)
📍Cambridge city permit office issues local permits
📍Check BBB Greater Cambridge chapter
📍Require MA state license + local city license if applicable