Direct Answer
The best window replacement contractors in Buffalo are verified through New York Department of State (dos.ny.gov). Look for companies with 4.5+ Google stars, 50+ reviews, active NY license, and at least 5 years serving the Buffalo area.
Full Explanation
Verify any Buffalo contractor at New York Department of State (dos.ny.gov). Request proof of general liability insurance and workers' compensation. Ask for references from recent Buffalo projects — local experience matters for understanding permit requirements and area-specific challenges.
Local Factors in Buffalo
📍Verify license: New York Department of State (dos.ny.gov)
📍Buffalo city permit office issues local permits
📍Check BBB Greater Buffalo chapter
📍Require NY state license + local city license if applicable