Given Australia is fairly dry country (current flooding excepted), we changed our water usage considerably: changed to a front-loader washing machine, updated the dishwasher to one with minimal water usage, and changed a lot of taps and our shower heads to low flow types. It's cut our water usage by 60-70%. In particular, the Miele washing machine made a huge difference.

oklouise thanks for the ideas. We have actually really thought about the zoning. We want the two bedrooms on the southern side with a bathroom between for privacy. We also want the eastern lounge room to pop out as a dining room in that spot will waste a gorgeous view. We had a straight alfresco and thought it was all a bit hohum. I will attach the first and second drafts to see where we have come from. The first draft we had drawn was too boring for us ... Garry hated draft 2 as he thought it was too wide for solar access and didn't give cross ventilation (north to south or vv). It's only positive was the flow of west/east cross ventilation. Also the bathroom was too tucked away for guest use when we are using that nice alfresco area. We quickly scrapped all those ideas... LOL As I said, we like skillion roof lines and are planning on clerestory windows to maximise northern sun. Some raked ceilings will probably happen too (and definitely 9 foot ceilings in living areas). the mudroom/laundry will probably be incorporated into the hallway. Unlike some on this forum previously I don't object to entering through the laundry. It kind of gives a landing spot for groceries from the car on those cold days you don't want to leave the whole house open. The garage may actually be a carport to ensure we can have ventilation come through that way and to help us with budget.

My house is also built at the top of a hill, the summit and is cut into a cliff. We bought it, it was built in the 90s and the orientation is entirely wrong. The living areas face west and all bedrooms are in the east. The master is exposed to the western and the northern sunshine. It’s nice in the winter and entirely unbearable in the summer. The same goes for my living room. We take extra long holidays in the summer to avoid being at home. The home had no insulation in ceilings, and raked ceilings. So the first thing we did was remove the roof sheeting install battens to create a cavity and installed R3.5 insulation. We are also upgrading installing new windows to upgrade the glazing on the western windows and looking to put insulation in all the walls It also gets really windy, so windy. So I understand your concerns. When it gets windy the entire house shakes. So the next thing will be to improve the bracing. There is a 3-4metre clearance under our home for storage. We could do a build in under. Even with the positioning of our shed and close proximity to the home it does little to shelter from the wind. We are considered the building an “outdoor room” which would act as an alfresco with skylights, lounge, pool and kitchenette that could act as an outdoor entertainment area when weather permits. I just did a sustainable design for a client nearby. I am so jealous of her amazing home. Her land is smaller then my land and her land cost the same price as my house and land. So I am grateful for what I have.

Obperth2014, I would suggest standing in the middle of the block, and getting to know where the sun comes up and goes down, and where the breezes come from. Yes we can all do this with a map, but it is good to actually go to the sight with a compass and a map. In Perth we have the strong southerly winds, and westerly winds from the coast. Therefore cross ventilation from that direction is good for cooling the home down in summer. We also have a hot easterly wind in the summer, coming off the desert. This time of the year is great to stand on the block and see the winter sun direction. In my previous post I have mentioned the summit home design, "the mod" I still think this is a good design for your block, with west side covered with a large vergola or fixed system. This will then utilise the full yard from your living areas. Front living room windows can be moved to be north facing, with a smaller window on the northwest frontage. Anyway, food for thought.