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Quality & Performance

Green Building


Committed To Building Certified Energy-Efficient, Green Homes... and now we have the program to back it up.

Savings are thanks to HERS—the Home Energy Rating Score. (A national index that rates all homes for energy usage; similar to the MPG rating of a car.) Tim O'Brien homes score between 35 and 60 on the HERS Index—lower than most new homes—which adds up to significant savings each month. We guarantee your new Tim O'Brien home will perform 30% better than a typical new home. If yours does not, we will reimburse any additional heating and cooling costs you incur. For a full five years.**


Why do we have the lowest HERS rating of any new-home builder around? (Video courtesy of RESNET®)

Our strict building processes focus on:

  • Energy Efficiency
  • Indoor Air Quality
  • Water Conservation
  • Resource Conservation It all adds up to maximum comfort, energy savings and lower cost of homeownership…today, tomorrow and beyond.

Certified Green Homes that Meet Sustainable Building Practices, Energy Standards & Save Money

Every Tim O'Brien Home meets the Focus on Energy Requirements and Green Built Certified and includes 3rd party testing. This rigorous testing inspects: R-Values, foundation walls, door and window leakage, mechanical ventilation, ducts and duct leakage, and all lights and appliances. Each home goes through a Blower Door Test to ensure the Whole System is performing exceptionally. Test results are analyzed and a cost-savings is calculated.

Please visit our Awards Gallery to see our NAHB Green Certified homes.

Tim O'Brien Homes participates in the following programs to ensure your new home is a sound investment now and in the future.

Wisconsin Focus on Energy
Every home in the Focus on Energy New Homes Program undergoes a series of performance tests and must meet specific program standards, including:

Focus on Energy
  • Framing and insulation installation review
  • Air-tightness to minimize drafts and create superior indoor air quality
  • Sealed combustion equipment and carbon monoxide detectors to ensure safety
  • Whole-house ventilation installed for proper ventilation

Upon certification, Tim O'Brien Homes homeowners receive a Homeowner's manual, a certification report that shows the home's energy savings, and a Focus on Energy New Homes Certification Plaque.

Proud to have our own, Don Esposito featured in the New Home Certification video. (Video courtesy of Wisconsin Focus On Energy®)


The Home Energy Rating Score (HERS) is a national index that shows where a home lands on an energy scale, and every Tim O'Brien Home is tested and has a score. A HERS of 0 means the home is zero energy and uses no energy at all. If a new home was built to new code specifications it would receive a score of 100 and existing older homes typically score 150 and higher. Tim O'Brien Homes score between 35 – 60 on the HERS Index, and we've even built a home with a negative HERS score. The lower the score, the more energy-efficient the home and the more money the homeowners will save.

HERS Home Energy Rating

Energy Star
This government-backed national program helps businesses and individuals protect the environment through superior energy efficiency. All Tim O'Brien Homes feature Energy Star products including appliances, building products, heating and cooling products, lighting, and in our plumbing systems.

Energy Star

National Association of Home Builders (NAHB) Green Certified Home
This national program is committed to providing objective, third-party assessment, verification, and certification services to help builders. When applying for certification, homes are evaluated on:

NAHB Green Building
  • Energy efficiency improvements such as high levels of insulation, efficient HVAC systems, high-performance windows and energy-efficient appliances and lighting
  • Water conservation measures such as water-efficient appliances and fixtures, filtration systems, and drought resistant or low-maintenance landscaping
  • Resource conservation using materials and techniques such as engineered wood and wood alternatives, recycled building materials, sustainably harvested lumber, and more durable products
  • Indoor environmental quality considerations such as effective HVAC equipment, formaldehyde-free finishes, low-allergen materials, and products with minimum off-gassing or low volatile organic compounds (VOCs)
  • Site design planning such as minimizing disruption and preserving open space
  • Homeowner education through manuals and operating guides
  • Green business practices that adopt ideas from other industries for saving resources and money in the home office


*The HERS (Home Energy Rating Score) is a national index that rates all homes for energy usage. Tim O’Brien homes score between 35 and 60 on the HERS Index—lower than most new homes—which adds up to significant savings each month. **Based on “as designed” industry standards per WIUDC Energy Cost Compliance. Your actual energy costs and savings may vary. See a New Home Consultant for complete terms and conditions.

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