GB3 Energy
GB3 Energy

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About GB3

Our Philosophy

GB3 is commitment to making homes and offices more comfortable, healthy and energy efficient. Our energy audits provide clients with a customized and comprehensive understanding of how their home or office works and how the performance can be improved. GB3 prides itself on being a full service company; from the energy audit through improvements, homeowners can rely on GB3 for comprehensive energy solutions.

Our Qualifications

  • Extensive green building and construction industry experience
  • RESNET certified Home Energy Raters
  • BPI certified Building Analysts
  • BPI certified Shell and Envelope Specialists
  • BPI certified Heating Professionals
  • LEED Accreditation
  • Fully licensed and insured


Our Founder

Bill Lucas photoBill Lucas-Brown

GB3 co-founder Bill Lucas-Brown is an experienced green builder and licensed general contractor. He is a licensed RESNET Home Energy Rater, a LEED Accredited Professional, a BPI Building Analyst, a BPI Shell and Envelope Specialist, a BPI Heating Professional, and a graduate of CSU’s first Green Building Certificate Course.

Originally lured into green building by straw bale homes in the early 1990s, Bill has managed and/or built a number of progressive homes, including two featured on the cover of the Boulder Green Building Journal and one on the front page of Conservation Magazine. Since co-founding GB3 in 2008 with Grant Swanson, GB3 has audited and retrofit thousands of homes throughout Colorado. Bill holds a BA in Japanese and a BS in Environmental Biology from the University of Colorado. Bill has lived in Colorado since 1972 and currently splits time between Steamboat Springs and Denver with his wife Jennifer, daughter River, and son Wilson.

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