Building Performance Cooperative
A worker-owned builder that warranties the temperature in every room.
What they're known for
A Connecticut builder and construction manager for Passive House and deep-energy work, with six DOE Housing Innovation Awards and a written warranty that commits to numbers instead of adjectives.
Building Performance Cooperative, also known as BPC Green Builders, is a Connecticut builder and construction manager focused on Passive House and deep-energy work. DOE and PNNL case studies document multiple projects with blower-door results around or below Passive House thresholds, and the firm has accumulated six DOE Housing Innovation Awards. Its unusual strength is candor: it publishes performance commitments, distinguishes certified from non-certified projects, and treats airtightness, ventilation, comfort, and radon control as contractual or measurable requirements rather than lifestyle language.
Capabilities
- Custom Construction
- Deep-Energy Retrofit
Performance focus
- Passive House
- Indoor Air
- Thermal Comfort
- Healthy Materials
Credentials
DOE Zero Energy Ready Home
Certified on multiple houses. Six DOE Housing Innovation Awards between 2013 and 2021, each confirmed on the Department of Energy's own winners pages, including a 2015 Grand Winner in the custom category.
LEED for Homes Platinum
Achieved on the Taft School faculty residence, 2015, along with USGBC's Outstanding Single-Family Project award. Awarded to a four-party team including Trillium Architects and Steven Winter Associates, not to the builder alone.
Certified Passive House Consultant (CPHC)
Held by Chris Trolle. PHIUS awards this to individuals, not to firms.
PHIUS+ Certification
Claimed by the firm on three houses. DOE case studies corroborate two of them; the third has no independent record.
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Sources
- DOE Housing Innovation Awards — 2015 winners
- DOE Housing Innovation Awards — 2021 winners
- DOE Zero Energy Ready Home case study — Trolle Residence
- DOE Housing Innovation Award poster — Hillside Passive House
- USGBC 2015 LEED Homes Award winners
- The Taft School — Building Green
- Fine Homebuilding — 2020 FHB House, Greenwich CT
- Building Performance Cooperative — The Green Warranty
Facts verified July 2026. Compound is an independent editorial directory and is not affiliated with this company unless stated.