What is sustainable design and construction?

“Sustainable design is not just lower energy bills. It is health, comfort, moisture safety, and long-term performance.” We sat down with Marcus Strang, Technical Lead in Passivhaus at HIP V. HYPE, to explore what sustainable building design really means in practice. With a PhD from the University of Queensland and deep expertise in building science, Marcus shares how Passive House design is helping shape healthier, more energy efficient buildings in Australia. We unpack how Passivhaus principles go far beyond energy efficiency. This conversation covers thermal comfort, indoor air quality, moisture safety, and why high-performance homes need to respond to Australia’s diverse climate zones. Marcus explains how sustainable architecture is not about applying one formula everywhere, but about designing buildings that perform properly in their specific environment. A major focus of the episode is hygrothermal modelling and moisture movement in engineered timber buildings, including CLT construction. Marcus shares why condensation risk, mould prevention, and long-term durability are critical parts of sustainable construction, especially in hot and humid climates. If you care about building performance, timber construction, and low-energy design, this part of the conversation is especially valuable. We also talk about the bigger picture for the construction industry. How technical expertise, early design decisions, and better collaboration can help drive net zero carbon outcomes and more resilient buildings. If you are interested in Passive House Australia, sustainable design, building science, energy-efficient homes, and the future of high-performance construction, this episode is packed with practical insight. 👇 CHAPTER MARKERS 👇 00:00 Intro 01:58 Favourite Passive House Build 03:19 Meet Marcus Strang 04:05 What Is High Performance 07:44 Passive House In Humid Environments 12:41 ERVs And Dehumidification 14:08 Why Schools Need It 20:30 Commercial Modelling And Roles 22:52 Conflicts And Certification 23:37 Avoiding Certification Failures 25:29 Common Airtightness Mistakes 27:07 Moisture Risk in Cavities 27:29 Ventilated Brick Drainage 28:22 Photo Checklist Workflow 29:52 First Home Retrofit Plan 33:12 Low Cost Efficiency Upgrades 34:40 Step by Step Passive Retrofit 35:01 Windows and Air Quality 37:41 External Insulation Debate 42:06 Airtightness Without Intello 46:20 Apprentice Mindful Moment 48:44 Embodied Energy Tooling 50:57 EasyPH Controversy 52:14 Wrap Up and Thanks LINKS: Connect with Marcus: https://hipvhype.com/our-approach/our-people?t=marcus-strang Our Sponsors: Pro Clima - https://mindful-builder.captivate.fm/proclima MEGT - https://mindful-builder.captivate.fm/megt Connect with us on Instagram: @themindfulbuilderpod Connect with Hamish: Instagram: @sanctumhomes Website: www.yoursanctum.com.au/ Connect with Matt: Instagram: @carlandconstructions Website: <a href="http://www.car