CORE Construction is the 5th largest K-12 school builder in the country with the national headquarters being located in North Texas, and more than 20 offices nationwide. At CORE, The Client Decides. We know that clients drive our economic engine, and without them, our engine fails. We work hard to provide the highest level of professional service possible and to be the best in the world at it. Most importantly, CORE is deeply passionate about trust, especially earning the trust of our clients.