My wife and I have found a plot of land with planning permission. We want to build a low energy home to passivehaus principles. We are wandering how we can use the design that is already on the plot? Would we need to establish a relationship with the architect that designed the plans in order to move forward. Or, would the plot owner provide us with the designs so that we could work with an architect that we know have worked on passivhause designs in the past? We are happy with the floor plans of the design as it is and hope that, by using this design, we could save money on the design phase. Do you think this would happen or would we end up spending just as much money potentially adapting the plans to work towards passivhause standards?