Appendix A “Yes, a lot. Simple training and simple design details are required. The designer needs to draw easy to follow details […] The key to keeping costs down is to have experienced foremen and workers who take pride in their work […] Academies and college courses will ensure the work force is there when needed.” [Passivhaus Consultant]
“On one of our Passivhaus projects we tried to reduce the risk by opting for SIPs construction for the envelope. This reduced the number of interfaces to be air sealed and ensured a level of quality by utilising offsite manufacture […] Contractors – particularly large ones – tend to have a very traditional approach in terms of construction methods […] Passivhaus doesn’t always have to cost more, for example, Architype’s School in Wolverhampton.” [Technical Architectural Director]
“Much of the increased cost is down to risk factors and the extent that on-site quality is required, resulting in more time checking and verifying performance. The costs increase can be partly attributed to imported equipment, for example; triple glazing , and the use of offsite processed construction systems that the UK is not currently geared up to deliver” [Policy advisor]
“Inexperience usually costs more than just money; time lost, incorrectly installed equipment can be costly. But premiums are charged for using ‘unfamiliar’ technology and systems.” [Supply Chain Manager]
“People aren’t sure how to price Passivhaus. It needs a learning curve on how to price it.” [Construction Skills Director]
“Costs more because of elements like triple glazing, MVHR, more insulation, skilled labour and products not as readily available […] The volume house builders can build so cheap because they understand exactly what is required, the supply chain knows exactly what they’re doing and they work with standard house types. This brings efficiency […] New technology involves more thinking, design and construction time […] The site plays a big part in Passivhaus. If the site is not orientated favourably this can increase costs dramatically. We call these additional costs ‘Passivhaus abnormals’.” [Specialist in Passivhaus Project Management]
Question 6: What is being done to encourage local supply chains to deliver low energy projects?
“Nothing at all. The Passivhaus Trust is a good source of marketing for local manufacturers.” [Passivhaus Window Manufacturer]
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