About Us

Cornerstone Services is a family operated business serving St. Lawrence and Franklin Counties. We provide commercial and residential plumbing, heating, ventilation, air-conditioning, gas conversions, and energy saving services.

  • BPI (Building Performance Institute) Accredited Contractor
  • Home and Business Natural Gas Installation and Inspection
  • EPA (Environmental Protection Agency) Backflow Tester and Installer
  • NYSERDA Certified Energy Manager and Energy Auditor
  • Certified Rinnai Dealer
  • Certified TRANE Comfort Specialist
  • Fujitsu Heating & Cooling Systems
  • Certified Geothermal Design and Installation
  • Uponor Designer- Installer
  • WardFlex Designer-Installer

I would highly recommend Cornerstone Plumbing and Heating for all your needs in the North Country. Thanks to Andy and Barry, the installers .Very professional and courteous. ~ Mary Lee Ten Eyck

Cornerstone Services has participated in the construction of many regional building projects. Whether it’s a commercial or residential project, Cornerstone brings our years of experience and commitment with a high level of excellence to the installation and completion of your project.

Download our brochure.