Performance
by Design.
Integrated Passive House consulting — uniting modelling, certification and advanced building science to ensure measurable and buildable performance.
About Us
LAB Design is a specialist Passive House and building-science consultancy working with architects, builders and suppliers across Australia and internationally.
Since 2014, we have supported more than 200 projects pursuing the Passive House standard, providing independent modelling, certification and technical analysis to deliver verified performance.
We do not produce architectural designs. Our role is to strengthen project teams with rigorous, evidence-based guidance that supports buildable and compliant outcomes.
We prioritise disciplined optimisation, avoiding unnecessary over-engineering while maintaining certified Passive House performance.
Scott and Madonna both teach within the Certified Passive House Trades program, contributing to industry education and raising standards in high-performance construction. In addition to consulting on hundreds of projects, they have designed and constructed two of their own certified Passive Houses — experience that informs their practical and buildable approach to performance.
Meet Scott & Madonna
Scott Stewart
Certified Passive House Designer & CertifierScott is a Certified Passive House Designer and Passive House Institute Certifier — one of only a small number in Australia.
With a background in aeronautical engineering, building design and a 20-year Air Force aviation career, he brings analytical precision and practical problem-solving to complex building-performance challenges. His work focuses on PHPP modelling, thermal bridge analysis and certification strategy.
Madonna Stewart
Certified Passive House Tradesperson & WUFI ProfessionalMadonna is a Certified Passive House Tradesperson and WUFI Professional.
Beginning in the family construction industry and followed by 12 years in Air Force aviation, she combines practical construction insight with technical precision. With a science background and international training in WUFI modelling, she specialises in hygrothermal and condensation-risk analysis.
Licences & Memberships
- Passivhaus Institute Building Certifier
- Certified Passivhaus Designer
- Certified Passivhaus Tradesperson
- WUFI® Professional
- Bachelor of Building Design
- Bachelor Technology (Aeronautical Engineering)
- Bachelor Science
- Diploma of Project Management
- Member of APHA & IPHA
- BDAA: 1633-14
- QBCC: 15130400
- VBA: DP-AD 63141
Integrated consulting across
certification, analysis and project support.
LAB Design provides specialist Passive House and building-science consulting to support architects, builders and product suppliers from concept through to certification.
Passive House Certification
Independent Passive House Institute accredited certification services, providing clarity, oversight and compliance throughout the project lifecycle.
Thermal Bridge Analysis
Quantification and optimisation of junction performance to support passive house compliance, including support for window suppliers requiring Passive House data.
Hygrothermal & Condensation Risk Assessment
Advanced moisture and condensation modelling aligned with NCC requirements, including Condensation Management Performance Solutions where required.
Passive House Project Consulting
Engaged consulting structured across three key phases — Feasibility, Design and Construction. Depending on scope, services may include:
Initial PHPP modelling (mechanical & glazing specifications)
Thermal bridge analysis
WUFI hygrothermal modelling
Construction detail optimisation
Coordination with builders, architects & engineers
Certification coordination with the appointed Certifier
PHPP updates to as-built stage
Passive House Database submission for certification
Service Engagement
Services may be provided individually or as part of an integrated package.
In accordance with Passive House Institute requirements, certification services must remain independent. Where LAB Design provides project consulting, certification must be undertaken by an independent third-party certifier, and vice versa.
Get in Touch
If you are planning a Passive House project, require certification services, or need specialist building-science support, we welcome the opportunity to discuss your project.
LAB Design — Passive House & Building Science Consulting
Based on the NSW Mid-North Coast
Working Australia-wide and internationally
Email: info@labdesign.com.au