ReNü Engineering Inc.

We are mechanical engineers who value building envelope performance and energy efficiency. ReNü offers energy auditing, energy modelling, and mechanical design services. Our designs are heavily influenced by the Passive House standards.

We are passionate about creating cost effective, low impact buildings with healthy and comfortable indoor environments.

We cater to clients across Canada and are licensed in BC, AB, YK, NT, & ON to engage in the practice of Engineering.


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Stuart Fix is the Principal of ReNü Engineering. He is a professional mechanical engineer with a master’s degree in building science and holds certification as a Passive House Designer in both Germany and North America. Stuart is a founder of Passive Buildings Canada and sits on the Passive House Institute US’s technical committee. Stuart has a background in machine design and project management, and has been active in high performance building design since 2008. He focuses on leading edge mechanical design, and is fascinated with the integration of mechanical and envelope systems, in the pursuit of cost effective energy efficiency. Stuart is an accomplished technical designer and an experienced contributor to inter-disciplinary groups in a global setting.

Mark Napora is a professional mechanical engineer with ReNü Engineering. Mark is a certified Passive House Consultant with a diverse background in mechanical design and consulting. Mark is inspired to deliver high performance, low impact buildings that deliver health and comfort through intelligently designed mechanical systems coupled with a solid building envelope. He has a strong interest in Building Science and is committed to designing buildings that are durable, sustainable and that deliver exceptional thermal comfort and indoor air quality. He also practices Permaculture and strives to create functional and affordable human habitat that will provide a positive impact on our environment.

Mike Otto is a professional mechanical engineer with ReNü Engineering. He is a Certified Energy Manager and LEED Accredited Professional with Operations & Maintenance specialization. Mike serves as Vice President on the Association of Energy Engineers Alberta Chapter board. In addition to providing energy modeling and other high-performance new building services, Mike is ReNü’s lead energy auditor. Mike has recently relocated to Yellowknife, NT, and is focused on serving Canada's Northern markets. He has previous experience working as an energy manager on the building owner’s side, and brings this experience to the energy auditing process to ensure all recommended energy conservation measures are accurate, feasible, clearly understandable, and appropriate for the client’s operational realities.

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Lucas Maidens is a professional mechanical engineer and Certified Passive House Consultant with ReNü Engineering. Lucas brings a diverse set of experience including project management, technical sales, and mechanical design. He sees many opportunities for robust and efficient design, and enjoys working with clients to optimise building systems and envelope. His approach is centred around how the little things come together to create a final result. Lucas balances his work with music, community, and a healthy dose of mild adventure.