Improve Building Performance

Our Services

CET helps building and design professionals design and build homes and multifamily buildings that meet today’s cutting edge standards for performance.

Contact us to get started today! Call 888-452-8805opens phone dialer or use our Contact Form.

We have particular expertise and experience in high performance multi-family projects, many of which are affordable housing projects.  We also focus on high performance single family homes including Net Zero and Passive House.

We look forward to working with you!

Passive House

Passive Houses and Passive Buildings use very little energy and provide superior comfort by incorporating very tight air barriers, superinsulation, high performance glazing, heat recovery ventilation, and other features.  CET can help you determine if Passive House certification is a realistic target for your project and then help you navigate the certification process from start to finish.

opens in a new windowLearn more about Passive House.


The Home Energy Rating Systems (HERS) is used for code compliance, rebates, and as a prerequisite for other certifications like ENERGY STAR, Indoor Air Plus, and Zero Energy Ready.  It can be used for new construction, renovations, and additions for residential buildings of all sizes.  CET can help you create a specific plan for achieving any HERS index cost-effectively.

opens in a new windowLearn more about HERS Ratings.

LEED/LEED Certifiable

LEED for Homes and LEED for Multifamily ratings systems score the environmental sustainability features of residential buildings, including location, water efficiency, energy performance, use of materials, and indoor environmental quality.  CET can help you identify credits that are a good fit for your project goals to achieve LEED Silver, Gold, or Platinum.

opens in a new windowLearn more about LEED.


ENERGY STAR new homes and multifamily buildings are 20% more efficient than standard new buildings, and they include common-sense features to ensure good air quality, durability, and comfort.  CET can work with you during the design and construction stages to incorporate all ENERGY STAR features into your building and ensure a smooth and successful inspection and testing process.

opens in a new windowLearn more about ENERGY STAR®.

Renovations and Additions

Existing building renovations and additions present unique challenges and opportunities for improving building performance.  CET has decades of experience assessing existing buildings and helping clients navigate the difficult choices involved with improving them.


Passive House
Garfield House
Williams College
Williamstown, MA

Passive House
Arango Residence
Amherst, MA

HERs Rated
The Lumberyard
Way Finders, Inc. & Valley Community Development Corporation
Northampton, MA

HERS Rated
Markesich Residence
Portland, CT

The Clarion
The Community Builders, Inc.
Boston, MA

Bullitt/Jonas Residence
Wright Builders
Northampton, MA

Leyden Woods Affordable Housing
The Community Builders, Inc.
Greenfield, MA

Habitat for Humanity –
MetroWest/Greater Worcester
Holliston, MA

Renovations & Additions
Jaques Ave Multi-Family
Worcester Common Ground
Worcester, MA

Our Team

We look forward to working with you!

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