Boston Redevelopment Authority
Energy Positive Housing
Fort Hill, Roxbury, MA


  • Multi-Family homes
  • Net  Positive Energy
  • For Sale Project

Market Rate  Home Styles

  • (1) Duplex Greek Revival unit with 3 Bedrooms
  • Duplex Carriage House---(1)  2 Bedroom Accessible Unit and (1) Second Floor 2 Bedroom Unit.

Affordable Home Style

  • Duplex Greek Revival with 3 Bedrooms


  • 5 to 7 kW Grid-tied Solar Electric Systems per Unit.
  • 12" Double Studded R-45 Low Density Foam Walls, R- 63  Cellulose Attic Insulation
  • Full Basement Homes Have R-20 closed Cell Foam Basement Walls and R-10 Rigid Insulation Under the Basement Slab.
  • On Grade Construction Homes Have R-30 Rigid Insulation Under the Slab and R-20 on the Slab Edge.
  • R-5 Windows
  • ENERGY STAR Certified Rating of Zero Energy Attainable 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

The Boston Redevelopment Authority (BRA) sent out a request for "Ultra" Green Projects for residential sites it owns.  Two were in the Fort Hill section of Roxbury and one was in Roslindale.  The city owns hundreds of lots that they hope can be built on using the winning projects as prototypes.

14 teams entered the competition for the rights to build on three different parcels of land in Boston.  Transformations partnered with Sage Builders and submitted a plan for a Greek Revival duplex and a Carriage House duplex in an beautiful historic area of the Fort Hill.

The Transformations team was selected for historic site in the Fort Hill section of Roxbury.  The project has since been approved by the Zoning Board of Appeals.  Construction is anticipated to start either in the late fall of 2015 or the early spring of 2016.

5-7 kW solar electric  systems are planned for the roof of the homes.  A 98% efficient Navien 180 instantaneous propane gas hot water system supplies ample hot water for the homes.  The HVAC systems are Mitsubishi Hyper Heat  air source mini-splits.

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.

The front Greek Revival duplex has a full foundation with 3.5" of R-20 closed cell foam/fire protection coating and 2" of R-10 rigid insulation under the slab.  The Carriage House has 6" of rigid insulation under the slab on grade construction and 4" on the slab edge.