CALL US TODAY: (720) 580-0122


Square One, Inc. is a commercial plumbing contractor, located in Castle Rock, Colorado offering commercial plumbing installation for small to medium size projects to include office building remodels, churches, school remodels, and tenant finish spaces that require quick turnaround. With over thirty-five years of plumbing installation experience, our goal for each project is the timely installation of quality plumbing systems that meet the schedule and quality requirements. Utilizing resources of our Plumbing and Mechanical design experience, our plumbing installation team incorporates knowledge of plumbing design methods and current material/equipment options.


To produce a quality plumbing product, Square One, Inc. is committed to strong communication with our clients and all members of the construction team. Our objective is met only when our client receives a final plumbing system that exceeds their expectations.


We provide the following commercial plumbing services:


  • Installation of waste and vent systems
  • Installation of domestic cold water systems
  • Installation of domestic hot water systems
  • Installation of domestic hot water recirculation systems
  • Installation of gas piping systems
  • Installation of water filtration systems
  • Installation of deionized water systems
  • Installation of compressed air systems
  • Installation of acid neutralization pre-treatment systems
  • Installation of sump pumps, sewage ejector and lift station systems
  • Installation of grease waste systems

commercial plumbing services