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A report published by GreenBuildingAdvisor on Oct. 30, 2026, examines two Brooklyn townhouse renovations that achieved Passive House certification using a shared project approach. The projects had different constraints, including landmarked historic features, but both involved early team coordination, detailed planning before construction and testing during the work.
Two Brooklyn townhouse renovations achieved Passive House certification through projects led by different contractors but guided by a shared method of early team coordination, preconstruction detailing and testing during construction, according to a report published Oct. 30 by GreenBuildingAdvisor. The account, written by architect Michael Ingui, describes how the approach was applied to buildings with distinct design and preservation constraints.
The projects were built by Taffera Fine Building & Finishes and Kleen Construction, contractors Ingui identifies as early collaborators in developing the systematic approach. Taffera completed the Carriage House, which the report describes as Manhattan’s first Passive House and also LEED Platinum. Kleen built the Cobble Hill project, described in the report as the first certified Passive House in a landmarked district. The source does not provide certification dates or independent documentation for those firsts.
The Cobble Hill Italianate is a mid-19th-century townhouse that underwent a gut renovation. Its front facade is protected by landmarks, and the replacement windows were designed with simulated divided lites to match the historic profile. The original front door remained; the project placed the airtight layer at an interior vestibule door instead. A two-story rear extension created space for a kitchen and a connection to a family room below. The cellar was also brought inside the home’s thermal envelope.
Ingui says BLDGTYP’s John Mitchell, a Passive House consultant and energy modeler, and Kevin Brennan, an airtightness and insulation expert, worked on both projects. The article says the contractors have since completed other Passive House work and opened their sites to contractor collectives. The supplied report excerpt gives limited detail about the second renovation, so it does not support a full comparison of its construction methods or outcomes.
How Early Coordination Shapes Renovations
The report’s central point is that high-performance renovation depends on coordination among the people responsible for design, energy modeling, insulation and airtightness—not only on selecting efficient equipment or materials. Bringing the team together before construction can help identify where a project’s performance goals meet its architectural and preservation constraints. Testing during construction gives teams an opportunity to check the work while corrections are still possible.
That approach is relevant to owners and builders working with older urban homes, where existing structures and protected features can limit straightforward upgrades. In Cobble Hill, the team had to retain the historic character of the front facade and original door while locating the airtight layer elsewhere. The example shows how project-specific detailing can address competing requirements, although the report does not provide measured energy savings, construction costs or long-term performance data for either home.
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Two Brooklyn Homes, Different Constraints
Ingui frames the projects as part of a decade-long development in his firm’s renovation process, shaped through collaboration with contractors and specialists. The shared method is presented as a set of repeatable practices—early coordination, working through details before construction and testing along the way—rather than a single design copied from one house to another.
The Cobble Hill property illustrates why the distinction matters: its landmarked street-facing facade and historic window profiles required a different response from a standard gut renovation. The report also identifies the Carriage House as a separate project built by Taffera, but the supplied excerpt does not include its location, design constraints or detailed construction account. The source page notes that the full article is available to GreenBuildingAdvisor Prime members, limiting the project information in the material provided here.
“Each project brings different challenges, but the fundamentals stay the same.”
— Michael Ingui, architect and report author
Performance Data Not Included
The source material does not give the projects’ energy-use results, airtightness test figures, construction budgets, schedules or the precise certification standards and dates. It also provides only partial details about the Carriage House and does not establish whether the two renovations achieved comparable measured performance. The descriptions of the projects as historic or regional firsts are claims made in the report; supporting records are not included in the supplied excerpt.
It is also unclear how broadly the teams’ approach can be replicated across other renovation types, or what additional costs and coordination time it required. The report presents the method as an account of professional experience, not as a comparative study measuring outcomes against projects that used a different process.
Further Project Details Remain Key
The immediate next step for readers seeking construction specifications or a fuller account of both projects is to consult the complete GreenBuildingAdvisor article, which the source page says is available to Prime members. The supplied material does not announce a new project, follow-up study or additional certification milestone.
For a clearer assessment of the method’s results, future reporting would need to include the homes’ certification records, measured energy performance, airtightness test results, costs and details of how the teams resolved construction issues. Until those figures are available, the report supports a description of the process and project features, but not a quantified claim about savings or comparative performance.
Key Questions
What is the report about?
It describes two Brooklyn townhouse renovations that achieved Passive House certification and were built by different contractors using a shared approach to planning, coordination and testing.
Which contractors built the projects?
Taffera Fine Building & Finishes built the Carriage House, while Kleen Construction built the Cobble Hill Italianate renovation, according to the report.
What made the Cobble Hill renovation distinctive?
The townhouse’s front facade was protected by landmarks. The team used simulated divided-lite windows to match the historic profile and placed the airtight layer at an interior vestibule door while retaining the original front door.
What shared method did the teams use?
Ingui describes bringing the project team together early, resolving details before construction and testing during the work. The source does not supply test figures or a quantified comparison with other methods.
Are energy savings or project costs reported?
No. The supplied source material does not include measured energy use, construction costs, schedules or airtightness test results for the two homes.
Source: greenbuildingadvisor.com
