In this episode of the Passive House Podcast, Ilka Cassidy talks with John Loercher, Passive House consultant, architect, and longtime Phius instructor with Northeast Projects. The conversation covers how the Phius standard has evolved since 2015 as well as growing industry attention to embodied carbon, hygrothermal modeling, and materials like straw bale construction. John also reflects on his years building the Phius Alliance New York chapter, the value of regional Passive House communities, and what excites him about expanding into new climates like Colorado's high elevation and PhiusCon's move to Phoenix.

www.ne-projects.com
https://www.linkedin.com/company/northeast-projects

Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, Mary James is joined by UK-based architects Dominic O'Riordan and Alan Budden, both Passive House designers who opened their homes for the UK's Passive House Open Days during a record-breaking heat wave. Dominic and Alan discuss how their buildings performed under extreme heat, the shading strategies they wish they'd fought harder for at planning stage, and why attitudes toward mechanical cooling in the UK are shifting fast after decades of treating air conditioning as unnecessary.

EcoDesign Consultants: https://www.ecodesignconsultants.co.uk/
Article mentioned by Zack: https://www.nytimes.com/2026/07/01/opinion/heat-wave-europe-america.html?unlocked_article_code=1.xlA.5iqJ._hKPg0bjq_M_&smid=url-share

Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, Matthew Cutler Welsh talks with Johann Betz, founder of Christchurch-based Offsite Design Ltd and a board member of OffsiteNZ. Johann's work focuses on helping designers, manufacturers, and builders deliver high-performance timber buildings through design-for-manufacture-and-assembly (DfMA) and offsite construction principles. The conversation traces the history of panelized construction in New Zealand, why past attempts at large-scale prefab factories have struggled without a pipeline of designs built for manufacture and assembly, and why a shared framework for offsite delivery could improve quality, reduce risk, and make Passive House-level performance more scalable and repeatable across the industry.

https://www.offsitedesign.co.nz/
https://www.osm3604.nz/

Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, we speak with Sven Maxa, founder and co-director of Melbourne-based Maxa Design, an award-winning practice specialising in high-performance, sustainable homes and Passive House design. A Certified Passive House Designer, Sven has been at the forefront of energy-efficient residential design in Australia for more than two decades, helping demonstrate that healthy, comfortable, low-energy homes can also be beautiful and practical.

Sven shares his key takeaways from the THRIVE Passive House Conference in Melbourne, reflecting on the growing momentum behind high-performance building across Australia. We discuss the significance of major volume builder Metricon’s presence at the event and what it could signal for the mainstream adoption of Passive House principles in the Australian residential sector.

https://www.metricon.com.au/

Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, Jay Fox talks with Nakita Reed, Senior Director for Preservation Operations at the African American Cultural Heritage Action Fund. Nakita discusses her new role bridging preservation, equity, and sustainability, the Action Fund's work funding projects like conserving Black modernism and stewarding sites such as Nina Simone's childhood home, and the ongoing tension between historic commissions and building owners pursuing energy retrofits. The conversation dives into practical guidance for practitioners tackling historic building and closes with a look at where the field is headed as deep energy retrofits of historic buildings become more routine.

https://savingplaces.org/stories/building-performance-standards

https://www.builtbuildings.org/dbth

Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, Matthew Cutler Welsh talks with Andy Marlow, director at Envirotecture and Passive House Design and Construct, for a recap of Thrive 2026 in Melbourne. Andy shares his take on the growing presence of volume builders and even a retirement living provider at the conference, the ongoing challenge of scaling prefabrication despite its clear advantages, and how ventilation and airtightness are being marketed as premium upgrades in the broader housing market. The conversation also touches on Australia's patchy policy landscape around retrofits and property incentives, new products spotted at the conference, and what's next for Envirotecture as they relaunch their pre-designed home offering.

https://www.envirotecture.com.au/

https://passivhausdc.com.au/

Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, Ilka Cassidy talks with Michelle Apigian, Managing Principal and ESG Director at ICON Architecture, about the moment that changed how she thinks about building design, Icon's path to becoming a high-performance practice in Massachusetts, and the unique challenges of bringing Passive House principles to occupied and existing buildings. Michelle also shares her wish list for the industry and where she believes architects have the most power to make a difference.

https://www.iconarch.com/
Join us on the Reimagine Buildings Collective: https://collective.reimaginebuildings.com/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.

In this episode of the Passive House Podcast, Jay Fox talks with Mikhail Haramati, NRDC's state industrial decarbonization lead, about her path from California energy efficiency programs and policy work at UC Berkeley and LBNL, through the California Energy Commission and NYSERDA, to her current focus on embodied carbon in building materials.

They discuss the scale of the problem (cement and concrete alone account for about 8% of global emissions) and state-level policy momentum like Buy Clean initiatives and New York's Executive Order 22, which mandates EPDs and sets GWP limits for key materials. The conversation covers pathways to decarbonization—reuse and deconstruction, steel's reliance on recycled scrap and hydrogen-ready direct reduced iron, lower-clinker concrete mixes and SCMs, and mass timber—along with practical first steps for designers and policymakers: better data, smarter specs, and the right incentives and financing tools.

https://www.nrdc.org/bio/mikhail-haramati

https://collective.reimaginebuildings.com

https://www.nyserda.ny.gov/

Thank you for listening to the Passive House Podcast! To learn more about Passive House and to stay abreast of our latest programming, visit passivehouseaccelerator.com. And please join us at one of our Passive House Accelerator LIVE! zoom gatherings on Wednesdays.