build a sustainable house

My dream is to build a sustainable house that will not need any energy input at all. It will be based on a roman courtyard style with limestone internal walls and steel clad outer wall with insulation in the middle. There will be lots of natural light and ventilation and ABSOLUTELY no airconditioning because I HATE it. I want to have a very impressive solar array and solar hot water heating. There will only be the absolute minimum requirement of rooms around two internal courtyards, with the kitchen / dining area as the central hub where everyone gathers. Probably will cost a bomb!