Matthew Cutler-Welsh, Zack Semke, Mary James, and Ilka Cassidy

Passive House Podcast

Society EN ↓ 519 episodes

Interviews with the leaders, practitioners, and change-makers in the global Passive House movement. A production of Passive House Accelerator.

Author

Matthew Cutler-Welsh, Zack Semke, Mary James, and Ilka Cassidy

Category

Society

Podcast website

passivehouseaccelerator.com

Latest episode

Jul 8, 2026

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Episodes

Clint Gollop – CBG Construction 14.11.2022

Passive House Podcast o-host Mathew Cutler-Welsh sits down with Clint Gollop, of CBG Construction. Clint, an eighth-generation builder based in Wanaka, New Zealand, speaks about his introduction to Passive House, becoming a Passive House Tradesperson, and the shift in the general public’s understanding of what makes a well-functioning home.  Links to upcoming Passive House and Passive House-adjace...

Bonus: Sam McAfee of Zola Windows at PhiusCon 2022 11.11.2022

In this special bonus episode recorded at PhiusCon 2022 in Chicago, Passive House Podcast cohost Matthew Cutler-Welsh interviews Sam McAfee, NYC/LA Regional Sales Manager with Zola Windows.  https://www.zolawindows.com/   Thank you to Sto Corp. and Zola Windows for making the Passive House Podcast at PhiusCon 2022 possible. https://www.stocorp.com/ https://www.zolawindows.com/   Thank you for list...

Bonus: Sloan Ritchie of Cascade Built at PhiusCon 2022 10.11.2022

In this special bonus episode recorded at PhiusCon 2022 in Chicago, Passive House Podcast cohost Matthew Cutler-Welsh interviews Sloan Ritchie, President of Cascade Built, the Seattle-based Passive House builder and developer.  https://www.cascadebuilt.com/   Thank you to Sto Corp. and Zola Windows for making the Passive House Podcast at PhiusCon 2022 possible.  https://www.stocorp.com/   https://...

Bonus: Tessa Bradley of Artisans Group at PhiusCon 2022 09.11.2022

In this special bonus episode recorded at PhiusCon 2022 in Chicago, Passive House Accelerator's director of publications Mary James interviews Tessa Bradley, co-owner of Artisans Group.  https://artisansgroup.com/   Thank you to Sto Corp. and Zola Windows for making the Passive House Podcast at PhiusCon 2022 possible.  https://www.stocorp.com/   https://www.zolawindows.com/   Thank you for listeni...

Mariana Pickering – Emu Passive 07.11.2022

Passive House Podcast cohost Zack Semke interviews Mariana Pickering, co-founder of Emu Passive based in Fort Collins, Colorado. Emu Passive trains the trades in Passive House construction and provides Passive House consulting services. Mariana shares about what's new in Emu's work, including reflections on Emu's recent tradesperson training held in Santa Barbara. She also discusses the recent Mar...

Mahnaz Nikbakht + Robert Blount – ROCKWOOL (Special PH Component Episode) 03.11.2022

Passive House Podcast cohost Zack Semke catches up with Mahnaz Nikbakht and Robert Blount of ROCKWOOL North America. The three discuss the personal Passive House advocacy of both Mahnaz and Robert, the product innovations and design guidance offered by ROCKWOOL, and the application of mineral wool in two major projects (the Ken Soble Tower retrofit in Ontario and the Winthrop Center Passive House...

Kim Dupont-Madinier – Atelier Dupont-Madinier 31.10.2022

Mary James and Ilka Cassidy interview Kim Dupont-Madinier of Atelier Dupont-Madinier. Kim shares about her work weaving textiles into architecture, as well as her exploration of incorporating Passive House into traditional Mongolian architecture. Matthew Cutler-Welsh and Zack Semke join Mary and Ilka in person at the PhiusCon conference in Chicago to record the intro and outro of this episode. Ate...

Lisa White – Phius 24.10.2022

Zack interviews Lisa White, Associate Director at Phius, about her 10-year service there, the role of passive buildings in supporting and accelerating the clean energy transition, the new ASHRAE passive building standard underway, and the big Phius conference coming up this week in Chicago, PhiusCon.  Info about ASHRAE 227P: https://www.ashrae.org/news/esociety/new-ashrae-passive-building-standard...

Rob Conboy – Glavel (Special PH Component Episode) 20.10.2022

Passive House Podcast cohost Zack Semke catches up with co-founder and CEO of Glavel , Rob Conboy. The two discuss the new production facility for the foam glass gravel manufacturer, based in Vermont, and the steps Glavel has taken to produce its product with clean energy, dramatically reducing the embodied carbon of the material. Rob shares what advice he would give his past self as he was just g...

Enda McDonagh – Montgomery Sisam Architects 17.10.2022

Matthew interviews Enda McDonagh , Certified Passive House Consultant and principal at Montgomery Sisam Architects. Enda studied and worked as Architectural Technician in Dublin where he developed a passion for detailing. In 2010 he moved to Toronto, Canada where he has worked at Montgomery Sisam ever since. His portfolio includes projects for the education, supportive housing, and mental health s...

Carmel Pratt – Bright Power 10.10.2022

Passive House Podcast cohost Zack Semke interviews Carmel Pratt, VP at Bright Power in New York City. Carmel discusses her firm's work delivering affordable multifamily Passive House projects, including the recently-completed Park Avenue Green project, as well as two projects underway, Chestnut Commons and Vital Brookdale, all in NYC. Carmel and Zack also discuss the state of building energy polic...

Mark Siddall – LEAP 03.10.2022

Passive House Podcast cohost Zack Semke interviews Mark Siddall, Principal at LEAP Architecture in Durham, United Kingdom. Mark's work focuses on the design, delivery, and operation of ultra-low energy buildings and Passive House buildings. In this interview, Mark discusses his recently published paper on avoiding thermal bypasses to optimize building performance and improve the health & comfo...

Glenn Murdoch – Theca Architecture 26.09.2022

Passive House Podcast cohost Matthew Cutler-Welsh interviews Glenn Murdoch, Design Director at Theca Architecture in Christchurch, New Zealand. They discuss Glenn's early adoption of Passive House design, his role in the early days of Passive House Institute New Zealand, and his practice of using PHPP and Passive House design in all of his work, whether PH-certified buildings or not-certified.  Li...

Scott Kennedy – Cornerstone Architecture 19.09.2022

Passive House Podcast cohost Zack Semke interviews Scott Kennedy, Partner at Cornerstone Architecture in Vancouver, British Columbia. Trained as an engineer and an architect, Scott is a leading exponent of multifamily Passive House design, trailblazing the approach in Vancouver and championing the adoption of Passive House across Canada. He's also a longtime member of the Board of Directors of Pas...

Jon Iliffe – eHaus 12.09.2022

Cohost Matthew Cutler-Welsh interviews Jon Iliffe, a Director and co-founder of eHaus, the nationwide building company in New Zealand focussing on delivering Certified Passive Houses and high-performance homes. Jon discusses some of his previous experiences, including working for Rolls Royce in the UK and the exciting times ahead as demand grows for healthier, more efficient and lower carbon build...

Terry Bryers – Certified Passive House Builder 05.09.2022

Terry Bryers is an Auckland-based Certified Passive House Builder. Having worked on one of the first and most incredible EnerPHit projects in New Zealand, he has started his own building company to focus on Passive House and high-performance homes. Matthew Cutler-Welsh caught up with Terry recently and discussed his discovery of Passive House.  Stuff Magazine feature on EnerPHit project by Terry:...

Karen Manson – Meta Architects 29.08.2022

Cohost Matthew Cutler-Welsh interviews Karen Manson, Director of Meta Architects , a design-led practice in Christchurch specializing in high-performance building. Karen returned to New Zealand after gaining experience in a variety of projects in the UK. She completed Passive House training and established Meta Architects in 2015 and has recently been working alongside Pete Bielski of Ethos Homes...

Richard Yancey — Building Energy Exchange (BE-Ex) 22.08.2022

Matthew Cutler-Welsh and Zack Semke kick off Season 3 of the Passive House Podcast with an interview of Richard Yancey, Executive Director of Building Energy Exchange (BE-Ex) based in New York City. Richard shares his early training in high-performance building in Seattle in the 90s and early 00s, his introduction to Passive House during a visit to Brussels, and his work advancing building decarbo...

Michael Ingui — Baxt Ingui Architects 15.08.2022

To mark the Passive House Podcast's 100th episode, cohosts Matthew Cutler-Welsh, Mary James, and Zack Semke interview Passive House Accelerator's founder, Michael Ingui. Michael shares why he founded the Accelerator, the precursor networks that inspired the effort, and how the Accelerator has grown.  At the end of the episode, Zack shares info about the on-demand "Passive House Summer School" bein...

Jennifer Hogan — Pretium Engineering 08.08.2022

Jennifer Hogan joins Mary James and Ilka Cassidy for the 99th episode of the Passive House Podcast! Jennifer is senior project manager and the technical and service leader for environmental performance services at Pretium Engineering in Burlington, ON. Currently, Jennifer and her team are working on a phased retrofit of  20 story social housing building in Windsor, ON. Listen to the full episode f...

Luke Middleton — EME Design 01.08.2022

Luke Middleton is an award-winning Passive House Designer based in Melbourne, Australia. With early inspiration drawn from a brief period in London and then Czechoslovakia, Luke now has almost two decades of experience creating community, educational and residential buildings in Australia. He is one of a growing number of Australian designers exploring and evolving contemporary sustainable archite...

Michelle Lambert — Lambert Sustainability 25.07.2022

Michelle Lambert, principal and founder of Lambert Sustainability, chats with Mary James and Ilka Cassidy about the Northland Newton Development in Newton, MA. The project is transforming 22 acres of abandoned industrial property and unused land into a mix-use community with 800 residential units and 14 new buildings. The Northland Newton Development is another jewel in Massachusetts Passive House...

Michelle Apigian – ICON Architecture 17.07.2022

In the latest installment from his recent visit to Massachusetts, cohost Zack Semke visits the Cambridge Finch Passive House affordable project to interview Michelle Apigian, Associate Principal at ICON Architecture, a leader in the boom of Passive House development underway in Massachusetts today. Michelle guides a tour of the building as she discusses her Passive House work at ICON. Zack and coh...

Julia Klump – POAH 11.07.2022

As part of his recent visit to Massachusetts, cohost Zack Semke visits the Salem Heights Passive House retrofit project to interview Julie Klump, Vice President for Design and Building Performance at POAH (Preservation of Affordable Housing). The two discuss the details of the Salem Heights project, as well as Julie's extensive portfolio of Passive House work.  Zack and cohost Matthew Cutler-Welsh...

Brad Mahoney – MP Boston 04.07.2022

In this Fourth of July episode, cohost Zack Semke interviews Brad Mahoney, Director of Sustainable Development at MP Boston, about his firm's revolutionary development work in the heart of Boston. The two recorded the interview on the 19th floor of the iconic Winthrop Center, a 691-foot tall, 1.8 million square foot high-rise project that will house the world's largest Passive House (PHI) commerci...

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