Reliable. Consistent. Expeditious Customer Service. A Passion to be the Best. John J. Brennan Construction Co., Shelton, Conn., is experienced in a full range of construction services including site development, utility construction, aggregate material management, drilling, paving and trucking services. The company not only has a stationery crushing plant at its aggregate facility, but also has mobile units for on-site and transfer station convenience. With more than 120 years of continuous operations, Brennan has the capacity to meet your major construction needs.