Building Great Relationships since 1925! 100% employee-owned general contractor. We build nationally, with locations in AZ, CA, CO, IL, TN, and TX. W.E. O'Neil Construction has seen steady growth since its founding in 1925 in Chicago by the O'Neil family. Now 100% employee-owned (ESOP), we embrace people as our number one asset. Our award-winning teams are recognized as industry leaders. Our longevity can be attributed to our excellent staff of professionals, our integrity, our commitment to customer satisfaction, and our ability to embrace technology. Our combination of the financial strength of a large national contractor and the responsiveness of a small company brings the best of both worlds to our clients. Our experience covers virtually every commercial market sector using a broad range of project delivery methods including design-build, design assist, construction management at risk and lump sum bid.