DB.....A LOT of ideas and advice flying around here.......skimming through I see you are endeavouring to establish a basic concept for a designer/architect to consolidate for you, which is great.......whilst you may think this is a logical approach to achieve the best outcome, you are arguably just throwing around random ideas rather than properly resolving/focusing on the critical aspects ........my advice is do this: firstly clearly ascertain two things on paper, not in plan or building format but in writing...that is 1. List all your requirements/needs/goals and 2. Nominate a budget. Next, identify/research a logical local designer/architect option and approach them with this information....A designer's job is to come up with an appropriate concept/solution that best balances your requirements, aligned with a budget and of course make it viable within context/site. Sure, you want a cost effective/modest result, that's fine, and that will influence the solution, but as a general comment it feels like there is massive potential being missed considering the site..it dens;t necessarily have to be that big or fancy, but you have to put the EXPERIENCE of the home front and centre of the process, and not just think of it as a kitchen or whatever laid out this way or that ....This is about an amazing site and the living experience of that and the design should be based on this and bring together your specific requirements elegantly balanced in context......The issue I have scrolling through all this is that you have all these almost disconnected ideas of building form, but you have this incredible site....... the process of resolving the spaces ideally needs to develop from cues of the immediate environment/site in order to make the most of it since you are pursuing a customised solution.....agree with MB, every project has a budget and ultimately from experience this is in general the ultimate/overriding constraint. This project could be anything upwards from $500K and it will come down to the working out how far you want to take it, and what your priorities are over various levels.......this one has seriously significant potential -make sure you make the most of it as you're truly fortunately to have this opportunity to build a home for you and your family to enjoy there.......best of luck :) PD

keep in mind that my plan has single external walls and all the inside and outside walls are 10cm thick to make drawing easier and the depth of the verandahs includes the eaves, adding a brick veneer would use more space and given the choice it would be lovely to plan for a covered walkway and raked ceilings in the living areas and this is a very basic gable roof but there are lots of more exciting/expensive roof options to consider

Yes, I can't help but feel that I will regret moving the entry @afjp! My husband is keen, but I know that I'll hate it, walking halfway down the house just to enter. Thank you for your suggestions. @oklouise, you really have gone above and beyond - giving us a lot of food for thought! Thank you for taking the time to fiddle with our floor plan. Lots of options there. We can't go toward the front boundary anymore, unfortunately, but I like your thinking! @siriuskey, thank you too for taking the time to share your ideas - It is much appreciated. We did toy with the idea of using our existing living and dining like what you have, but I think I am leaning toward the open kitchen, living and dining at the back. You've used up every inch of space, it's great! Some more ideas for us to think about. Thanks! Just a question for those in the know-how much would it cost to move plumbing etc? And what would your ballpark $ figure/budget to do this extension be? (how long is a piece of string, I know...)

Just thinking about this more....because it is better than doing my overdue tax or taking palm trunks to the dump... :o) ......All of the designs have such great features to them and in some respects I need to just get a builder to look over them to let me know which would be cheapest for what I need and would like. Once the technical things are sorted (cladding, electrical, plumbing, insulation), the things that I like in a home mostly are inside/outside living (seeing views) and a bright, light filled space (natural light). I find it depressing ...literally.....to be in a living space that is dark. I wanted the living area to be maximised in this space due to the work that I want to do in future with girls with autism; a small open plan kitchen with this and this area that we use have the higher ceiling to make it feel bigger.... then I need an office space, which could even be largely shut away within a cupboard if necessary. I will lose the view and a bit of light from the back sliding door because of me putting a privacy screen with gate between this building and the pool area. I have a slight view and good light from the big sliding window at the back (I would have to close blinds though, if people were using the pool area). I definitely need more light coming in from the East where the leaking colour glass window is, but I would like for them to be high so that I cannot see the neighbour's house. I think the windows on the western side are sufficient because it gets very hot on that side of this building from about 4pm (earlier in summer). Then the sliding doors at the front bring in light, but at the moment it is not totally private becasue it looks onto the road from a long driveaway. My main bedroom can be small as long as it has room for queen bed, good storage, and room for a dog bed for a golden retriever sized dog. I like the idea of having the dogs going on the deck...however, they do bark at possums at night.(They have a lot of yard to use too during the day). I do need a room where a mother and new born pups can be isolated from the other dogs). I like the idea of having a toilet and basin of some sort, separate to the main bedroom, if there is only one toilet, because it provides separation from my personal things to the main living area. I guess the second space for the dog and pups could be a laundry or a "bedroom" or "office" or "storeroom". The area for the dogs has to be on ground level and I think I would prefer my bedroom to be on ground level too as I am not getting any younger (and want to think about future needs) and ideally I would to be here til my early 70's if all works out well. It doesn't worry me whether the main bedroom ceiling is high or not, because I spend so little time in there. However, it would be good if the other spaces (except bathroom/laundry) had the higher sections of ceiling to make them feel bigger. I am only saying all this, because when I look at all the plans, I think the best one may end up being mainly from one, with elements taken from another. Thanks so much for your help. I still have the option (one day) to maximise the use of the big attic space in the main house as with the non-compliant stairs to it and only two tiny windows in it, and it being so hot up there, it is not really useable at the moment, but the pool house is highest priority because until it is liveable, then I can't recoup any expenses by renting out the bigger space (the main house). (It does look like a demo site though in many rooms,)