WJ O'Neil Company brings over 40 years of full-service mechanical contracting expertise to facilities managers, property managers and building owners. With offices in Detroit and Chattanooga, and experience throughout the US, Canada, and Central America, our focus is on customer success, to understand your needs, recommend optimal solutions and deliver quality workmanship on every project. It’s pretty simple. We’ll make your priorities ours – then roll up our sleeves and get them done on time and within budget.