Jason Quinn, founder of Sustainable Engineering Limited, shares insights from his upcoming book on deep energy retrofits in New Zealand and explains why improving existing buildings is critical for creating healthier, more energy-efficient homes.
In the episode, Jason discusses the importance of taking “performance snapshots” to properly assess a building before beginning retrofit work, along with the benefits of prioritising the building fabric before relying on mechanical systems. He highlights a standout retrofit project that reduced energy consumption from 370 kWh/m²/year to just 58 kWh/m²/year, demonstrating what’s possible with the right approach.
Jason also explores the role of mechanical ventilation in improving occupant health and comfort, the advantages of external retrofitting methods, and why practical, high-performance solutions are becoming increasingly important in New Zealand. Supported by the New Zealand Green Building Council and EECA, his book aims to provide designers, architects, and builders with a clear pathway toward achieving the best possible retrofit projects.

Special Guest: Jason Quinn.

Chris Laumer-Giddens shares his journey into architecture and why airtight building envelopes are critical for preventing moisture and mould. Drawing on a Passive House project that achieved zero air leakage, he highlights what’s possible with the right approach.
Chris also advocates for simpler, more durable design, challenges over-complicated solutions like spray foam, and explains why ERVs can outperform HRVs when it comes to moisture control — all while keeping long-term comfort and building performance front of mind.

Special Guest: Chris Laumer-Giddens.

Kim Aitken shares her journey from Ireland to Scotland and into a diverse career spanning time with the British Army, Product Design Engineering, and Structural Engineering in Canada. She introduces Truss House™ - an innovative system using roof trusses as the primary structure to deliver faster, more efficient builds. Despite early hurdles, including a Dragon’s Den appearance and COVID-19 disruptions, the concept has gained strong traction in New Zealand through partnerships with Pryda and Bunnings Trade, with current plans on the drawing board for everything from modular to multi-storey housing.

Special Guest: Kim Aitkin.