Coppersmith Way
Townsend, Massachusetts

Home construction began in 2006 with models that saved 60% of their energy usage (HERS 40).  Through incremental improvements the savings increased to 80% by the summer of 2007 (HERS 20).  The SOLAR TODAY magazine featured "Built Green at Coppersmith Way" in the September/October 2007 issue.


  • Located in Townsend, MA
  • 41 Home Development
  • Currently Building Zero Energy Homes


  • $289,900 and up for Market Rate Homes
  • $195,200 for Income Restricted (Affordable) 3 Bedroom Homes

Market Rate Home Styles

  • 4 Bedroom Colonial
  • 3 Bedroom Colonial
  • 3 Bedroom Saltbox with First Floor Master
  • 3 Bedroom Cape with First Floor Master
  • 3 Bedroom Greek Revival
  • 3 Bedroom Victorian
  • 3 Bedroom Farmhouse
  • 3 Bedroom Ranch

Affordable Home Styles

  • 3 Bedroom Saltbox
  • 3 Bedroom Cottage
  • 3 Bedroom Ranch


  • 7 to 14 kW Grid-tied Solar Electric Systems
  • 12" Double Studded R-45 Low Density Foam Walls, R- 63  Cellulose Attic Insulation, R-20 Closed Cell Foam on the Basement Walls, R-5 Windows, and R-10 Rigid Insulation Under the Basement Slab
  • ENERGY STAR Certified Rating of Zero Energy and Positive Energy Homes


  • Ventilation systems, Low or No VOC Materials/Sealants/Paints, Hard Floor Surfaces


  • Water Conserving Fixtures, Rapidly Renewable Materials, Low Maintenance Materials

In early 2008, the four public utilities came out with the Zero Energy Challenge.  $50,000 in prize money for the three homes with the lowest HERS Indexes.   Six builders and home owners were chosen to compete.  Transformations was one of them with a "shovel ready" home design called The Needham.  We modeled the home and came up with a HERS 34 with our standard construction techniques at the time.

With various iterations in the design, the home was brought down to a HERS 0, using the RemRate software.  It included double stud walls, high R-Value attic insulation, a pre-heat solar hot water system, a mini-split system, a 5.7 kW PV system and energy efficient appliances.  The final as built home came in at a -4 HERS Index and won the $15,000 second place prize.  A detailed account can be found in the November/December 2008 issue of the SOLAR TODAY magazine (Click Here for the full article).

With further incremental changes, Transformations built a home in 2010 that produced more energy than it consumed.  Over a 12 month period, the home and its occupants produced 1,574 kilowatts more than they consumed.  This home was one of only six that were able to enter in the Northeast Sustainable Energy Association's annual Net Zero Energy Building challenge. 

To get there, we used a 98% efficient Navien 180 instantaneous propane gas hot water system to supply ample hot water for the home.  The HVAC system is the new Mitsubishi Hyper Heat  air source mini-splits.  They are rated to produce heat down to -13 degrees

The walls are 12" double studded 2x4's with a 5" gap between the two walls.  The R-Value of the low density foam that fill these walls is 45.  The attic has 18" of cellulose on the flat for an R-Value of 63.  The R-5 windows are triple glazed and filled with krypton gas.  2" of rigid insulation is under the slab in the basement and 3.5" of closed cell foam with a fire coating on the basement foundation walls.

These strategies became our typical standard for over 100 homes that Transformations currently has in its custom home and production development and building pipeline.