Long Island and New England’s Choice for Building Supplies For 75 years, Riverhead Building Supply has been trusted by builders, contractors, architects, homeowners, and industry professionals across Long Island and New England. With 800+ employees across retail locations, showrooms, manufacturing, and distribution, we support both the projects our customers build and the careers of the people who make it possible. Guided by our mission to consistently provide professional service, competitive pricing, and quality materials while supporting our local communities and environment, we are focused on doing work that matters. Whether you're a customer, employee, or candidate, you'll find a team committed to craftsmanship, collaboration, and helping others succeed.