In this episode of the Passive House Podcast, Mary James and Ilka Cassidy speak with Joel Callow, building physicist and founding director of UK consultancy Beyond Carbon, about scaling certified Passive House delivery in London. Callow explains the firm’s focus on whole life carbon, compact building forms, overheating avoidance, and early-stage design input, and notes the team has grown to 12 people with recruitment challenges as UK training ramps up via the Passive House Trust. He describes Beyond Carbon’s role in helping major developer Barratt adopt Passive House—through lobbying, 12–18 months of R&D, and cost and constructability work—leading to thousands of units in the pipeline and an estimated 15–20,000 London dwellings in progress.

https://www.beyondcarbon.uk/

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 Accelerator Podcast, Ilka Cassidy chats with Marty Josten and Ashley Wisse of New Ecology. Marty and Ashley describe the nonprofit’s 26-year mission to preserve and improve affordable housing through sustainability, building performance, health, and resiliency, using a hybrid fee-for-service and grant-funded model. They discuss evolving embodied-carbon requirements, regional market differences, misconceptions about Passive House cost, and innovations like drain water heat recovery, as well as engaging lenders and maintaining focus amid political and funding pressures.

https://www.newecology.org/

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 Accelerator podcast, Ilka Cassidy interviews Nathan Kipnis, founder of Kipnis Architecture and Planning in Chicago and Boulder, about his path from early solar architecture influences during the 1973 oil embargo to today’s fact-based, certifiable Passive House practice. Kipnis explains how early rule-of-thumb passive solar design often led to overheating, and how building science and climate-specific approaches improved outcomes. And describes his firm’s “high design and low carbon” approach, evolving client communication from quietly implementing efficiency measures to showcasing performance and resilience through smart home monitoring, batteries, and high-quality envelopes.

• KAP website
• NHA website
• Project profile for Evanston’s first Passive House in PHIUS’ database
• Crain’s Chicago Business Notable Leader in Sustainability 2025 recognition

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, Michael Ingui and Ilka Cassidy to share their interview with Dr. Wolfgang Feist from the 35th International Passive House Conference in Essen and discuss where Passive House is headed. Dr. Wolfgang Feist emphasizes focusing on documented, evaluated projects, the importance of integrated component systems. Looking back, he credits early collaboration with Swedish researchers and the push to build real demonstration projects, and he reiterates that the five principles remain unchanged because “physics is right.”

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 and Michael Ingui, are at the International Passive House Conference in Essen and share rapid-fire interviews focused on scaling Passive House. With questions based on Michael's presentation at the conference focusing on moving Passive House from niche to necessary by reframing it as risk mitigation and engaging adjacent sectors like insurance, real estate, finance, and policy. Interviewees describe scaling through large-volume delivery, education, supportive codes and incentives, and manufacturer-led training.

With interviews from:
Tomas O'Leary

Ann-Marie Fallon

Ken Levenson

Alexander Gard-Murray
In Cho
Francesco Nesi
Günther Jedliczke
Esra Aydinoglu

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 interviews Elizabeth and Everett Norris from their newly completed Christchurch home. They describe their Port Hills site on Huntsbury Hill, bought after the 2011 Canterbury earthquakes, and discuss the area’s microclimate and west–northwest-oriented design. They share challenges including long build times, working largely solo, living on site after a robbery, and more. They detail the key lessons on early builder input, avoiding rushed window orders, daylight implications of eaves, and airtightness detailing.

https://www.designmake.co.nz/people.htmlhttps://www.everhomes.co.nz/blank-1

About their amazing straw bale Passive House in Christchurch: https://sustainableengineering.co.nz/casestudy/norris-strawbale-passive-house/

In this episode of the Passive House Podcast Jay Fox interviews Vermont filmmaker Allie Rood about her documentary Prickly Mountain and My Design Build Life, which traces the design-build architecture movement that began in Warren, Vermont around 1963 and influenced design-build programs nationwide. Rood explains her personal connection through her father’s work in the community, the movement’s roots among Yale architects reacting against the designer/builder class divide, and ideas like Dave Sellers’ “Wild Beam Theory” of improvisational building. She contrasts early sculptural ski houses with a later sustainability-focused generation behind the Dimetrodon co-housing project and discusses Yestermorrow’s emergence as a design-build school. Rud also recounts the film’s 10-year production, funding and grant challenges, finding an editor, shifting to a personal narrative, and current festival distribution and screening plans.

https://allieroodfilms.com/
Trailer for the film: https://vimeo.com/1125499443?fl=pl&fe=sh
Reimagine Buildings: Designing for Survivability: https://events.ringcentral.com/events/reimagine-buildings-survivability/registration

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 chats with Nidhi Shah, a certified Passive House designer and member of the Reimagine Buildings Collective. Shah traces her path from early sustainability interests in India to Passive House training in the UK. They dive into her retrofit-focused work with Retrofit Action for Tomorrow (RAFT), emphasizing whole-building approaches over piecemeal measures like external wall insulation or heat pumps. Nidhi describes how funding criteria centered on operational carbon shaped retrofit decisions for cash-strapped public-sector buildings, and why reducing demand and peak heating loads matters alongside electrification and comfort.

https://www.retrofitaction.org.uk/s/RAFT-Whole-Life-Carbon-Report
Reimagine Buildings: Designing for Survivability: https://events.ringcentral.com/events/reimagine-buildings-survivability/registration

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.