Back Bay Passive House

2015 - First passive house project in Back Bay Boston.   The deep energy retrofit deployed non foam-based, vapor open assemblies, sensitive to 19th masonry brownstone construction.  The design and construction incorporated a new 5th story penthouse using the first known application of a thermally broken passive fire wall in MA, new state of the art building and automation systems, continuous fresh air, and contemporary interior finishes.  

Performance Index

EUI:  9.5 kBtu/sf/yr

Infiltration:  0.87 ACH50

Photography  Jane Messinger

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Cambridge Net Positive Passive House

First Certified Passive house in the City of Cambridge MA.  Project certifications include PH Certification, Net Positive,  Indoor Air-plus, LEED Platinum,  and a Building HERS Score of -11.   Design strategies included developing a subtle street presence, capturing sweeping vistas along the rear, and maximizing natural daylight for a 4 bedroom and aging in place ground level. 

Performance Index

EUI:  -3.7 kBtu/sf/yr

Infiltration:  0.67 ACH50

Photography Keitaro Yoshioka

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Roxbury Deep Energy Net Zero House

Two family residence in the heart of Roxbury Boston undertook an expansive addition while getting an envelope and building systems overhaul.   Exterior design maintained existing openings and re-imagined it's detailing with simpler lines. 

Performance Index

EUI:  0 kBtu/sf/yr

Infiltration:  0.62 ACH50

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Somerville Deep Energy Net Zero Ready

Comprehensive building overhaul including thermal bridge free and airtight envelope, continuous fresh air, upgraded building systems, and new interior layouts and finishes. 

Performance Index

EUI:  5.8 kBtu/sf/yr

Infiltration:  1.3 ACH50

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Beacon Hill Deep Energy Retrofit

Sited along the Charles River, a 1900th industrial building was re-purposed into apartment housing in the 1930's and is now undergoing it's 3rd interior renovation.  The project carefully preserves the integrity of its exterior masonry walls while bringing up the interiors to modern styling using passivehouse methodologies. 

Performance Index

EUI:  8.4 kBtu/sf/yr

Infiltration:  1.7 ACH50

Photography  Jane Messinger

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Cambridge Prefab Passive house 

The design build team is currently building a prefab passive house in partnership with EcoCor for new single family in Cambridge MA.  It targets LEED Platinum, Net Positive design, and will be the first certified prefab PH project in the City of Cambridge.   The exterior and interior architecture is based on Victorian design principles while being built with state of the art envelope and all electric building systems.  Its roof orientation and massing are designed to capture surplus power for the use of an electric car.  Feel free to visit our Instagram account to see images of onsite panel installation.  

Performance Index

EUI:  -2.4 kBtu/sf/yr

Infiltration:  0.23 ACH50

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Cambridge Multi Family Passive house 

Currently under construction is a new two family passive house near Central Square in Cambridge MA.  The project is targeting passive house certification, LEED Platinum, and Net Positive Design.  Unusual construction assemblies such as a "flat hip" roof structure was built to provide passive shading while eliminating perimeter thermal bridging often found along rim construction

Performance Index

p- EUI:  -3.8 kBtu/sf/yr

p- Infiltration:  0.75 ACH50  

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Needham Prefab Net Zero

Currently under construction is a new single family net positive house in Needham MA that meets Passive House standards.  The project is targeting passive LEED Platinum and Net Positive Design.  Our firm has partnered with EcoCor to develop a prefabricated core shell to reduce construction time, site waste, emissions associated with transportation, and to create a "near perfect" envelope that will ensure enhanced quality and a lasting product.  Noteworthy details include "open rain screen" facade systems using sustainably harvested timber, double story curtain glass walls, 3 story stairwells to promote positive cooling stack effects, and various architectural shading devices for sunlight control during cooling seasons.  

Performance Index

p-EUI:  -0.0 kBtu/sf/yr

p-Infiltration:  0.28 ACH50

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Somerville Passive House & Net Positive

Group Design Build is planning on building Somerville's first certified Passive House residence.  The project is targeting passive house certification, LEED Platinum, and will be a net positive building providing power to all building systems and annual car charging.  

Performance Index

p-EUI:  -13.2 kBtu/sf/yr

p-Infiltration:  0.25 ACH50

Image credit Garth Goldstein Studio Inc

Somerville Passive House Prefab Design B

Winchester Net Zero

New ground up single family targeting net zero design. 

Performance Index

p-EUI:  -0.0 kBtu/sf/yr

p-Infiltration:  0.85 ACH50

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© 2020 Group Design Build Inc.

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