This is the most common question we are asked.
The true answer is that it is cheaper to build a Passive House than a minimum NZ Building Code standard house in New Zealand.
One of the fundamental inputs to any design or build process is the budget. We design to match your budget. This may mean that your home is slightly smaller overall than it may have been, had you chosen a minimum NZ Building Code compliant home. This isn't why you're reading this though.
While the capital cost may be slightly higher, this extra investment pays for itself immediately through extremely low running costs, comfort and health.