A Practical Guide to Passive House Certification

As a building standard with a reputation for being ambitious  and technically-demanding, pursuing Passive House compliance can be a daunting task for even the most experienced of architects.

In this post by Gert Guldentops and Autumn Dean, we see that while the design and construction process is certainly challenging compared to code minimum buildings, the barriers to entry have never been as low as today given available technical and financial resources.

Projects that fail to achieve certification with Passive House often include some of the following characteristics: 

• lack of team experience and integration
• compliance issues during the design phase
• compliance issues during the construction phase
• affordability concerns 
• financing complications

However, there are several key tactics that can be used avoid these common pitfalls: 

1. Engage a Certified Passive House Consultant (CPHC) as early as possible. CPHCs can provide valuable information about project feasibility as early as the conceptual and schematic design phases. CPHCs also play a large role in coordinating with the other stakeholders, including the builder, MEP designer, and rater/verifier. As trained building science professionals, CPHCs can fill in any knowledge gaps that a traditional design team may have. 
2. Center the Passive House requirements and building physics principles throughout planning and design. Thermal control, air control, and moisture control must be integral to the design from the beginning. A comprehensive WUFI Passive energy model should be thoroughly leveraged during the design phase and heavily relied on to guide and evaluate design decisions. 
3. Engage the Rater/Verifier during the design phase and retain an experienced builder. The involvement of the rater/verifier is critical to the overall QA/QC process during construction, and not all builders have the expertise to deliver the level of precision that is necessary to meet the passive house targets. 
4. Maintain affordability through the existing Passive House design and construction principles. Keep it simple – elements like compactness, minimal glazing, optimized insulation levels, smaller HVAC systems, uncomplicated geometry, and designer and builder education can go a long way in preventing incremental construction cost increases. A Passive House project should only yield an incremental cost increase of less than 5% compared to their conventionally-built counterpart, though many Passive House projects have demonstrated cost increases below 2%.
5. Leverage state and utility programs to aid financing. Some states and cities will offer financial incentives to projects seeking Passive House certification, and many utility providers have rebate programs for energy efficient buildings. Some private lenders also favor Passive House developments, willing to provide lower interest loans.

Achieving Passive House certification may seem like an ambitious goal, but with the right strategy, expertise, and planning, it is more attainable than ever. By assembling an experienced and integrated team, prioritizing building science principles in design and construction, and taking advantage of economic opportunities, projects can meet Passive House standards efficiently and cost-effectively. 

(This is part 3 of a 3-part series: see part 1 and part 2)

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