We are a family-owned and operated building supplies company, steeped in history and experience spanning nearly 60 years. We are conveniently based in two locations: Excelsior Lumber Company is in Butler, NJ and Kaslander Lumber Company is in Newark, NJ. We are proudly recognized as one of the region’s premier building supplies and lumber companies, renowned for our impeccable service, quality products, and knowledgeable staff.