We have a similar home in a sydney beach suburb. We are in a different position where we have bought ours as a downsized but are just about to restore the old 50s beauty to its former self. We have quotes of around $400000 to gut and change the floor plan which includes 2 bathrooms and a new kitchen and also add internal stairs to the garage and a large deck off the back, lift some ceilings and replace gutters, eaves ect ect ect. Attached are my inspiration boards and what the house looks like now, hopefully in about 4 months I can update you.

The most important thing for you to do is get a GOOD builder and SMART architect that'll help you drive your reno dollar further. The architect will come up with brilliant ideas that make what you've got work smarter for you and a good builder -well, they're just worth their weight in gold! They'll both allow you to be the client which is the most important role for you to take on. The builder will work out the order of trades so that your reno takes the least amount of time. They'll also be able to speak to trades in a professional way to get you exactly what you want. I'd really suggest that you go to an architect to get your design plans firmed up - particulary if you're doing any extensions and find out what walls are load bearing. I'd also strongly suggest in the most enthusiastic terms possible - do your home work - have all your plans and materials, appliances etc done BEFORE you even take down a door - changes during the process will cost you big money (not to mention irritate your building team).

If you "change" anything that involves a building approval then the floor area on the plans relevant will count towards the overall amount. If it amounts to beyond 50% of the existing conditions then the whole building becomes applicable to energy calculations and so you enter into up spec'ing existing areas. And yes it can often be a good thing to be doing anyway, but of course it costs money. If the total area being changes is below 50% then only the areas of new work are applicable. I'm honestly not a specialist in this area, but I have to deal with the issues naturally in the course of the design and resolution of project solutions I provide, and hence I use an energy consultant regularly and we have a way/system of working through together how best to achieve the requirements for permit. As far as I understand it's a case by case/project specific exercise and also there's various ways of negotiating/achieving the necessary performance requirements - e.g. you can play around with different levels of insulation together with a particular glazing/window spec, and depending upon circumstances you can save money one way or another. Sometimes I'll squeeze windows overall down to get it under a certain amount to not trigger requirement for expensive glass...also timber windows rate better, but if you are in a bushfire area you'll be caught out or require very expensive timber windows...it's a real juggling act in particular contexts...which is why you really need to be working collaboratively with an energy consultant/specialist to work out the best solution in this regard, as well as the other aspects of design, structure and bushfire etc. It's a true team effort ;) If you're really up for some technical reading you there is some further energy info here NCC Volume One Energy Efficiency Provisions 2016 - Australian ... but it may get confusing........Coming back to the core of it, my advice: 1. define your budget 2. list and prioritise your requirements 3. seek some preliminary advice/assistance from a seasoned designer doing this type of work to test whether or not the general concept of what your endeavouring to achieve is viable, and this depends upon the relevant context/existing conditions etc (and bushfire rating is yet another layer on top of all this), and then refine the concept from there. If you are just doing a bathroom or kitchen isolated then you can arguably do it yourself, but if you're re-jigging the whole house like it appears you are heading towards, and on a very tight budget then I'd highly recommend (to save yourself headaches and frustration going around in never-ending circles) to invest some of your available budget into front-end design, to get to a solution that works to your nominated priorities so you achieve a viable and professionally advised outcome. Trust me it will be money well spent. Have a great Christmas, and best of luck with continuing to work through it all :)

You are most welcome, I have always said that I haven't been put on this earth to "Hug" toilets, so I'am wondering who is going to clean all of these Bathrooms. Our two kids a boy and a girl had the upstairs "apartment" which they and all their friends loved. I have added a timber stair case for fun, there's plenty of space but you will need to decide what you want to do in the attic and place the stairs to open up into a tall space. I have also turned one of the ensuites into a powder room. Your Jacaranda's only drop once a year!, you used to be able to trim them by 25% each year, you would need to check with your council, we were on the lower North Shore, I think you should consider the patio side of the house and make better use of that, is the front deck something you plan on adding because of aspect, and plant some tall growing hedge ready for the apartments. Our kids Attic desk/study space over looked our pool in the rear garden. With respect to using the formal rooms for bedrooms, you will find that once you have your large family/alfresco and the kids have their upstairs space if you still feel you need it, it would make a great office. You spend most of the time there only using only using the front room in the evening for watching movies etc. I have had another play with my floor plan, I think if your wife sees this you may be in trouble, it's a Master Suite, the free standing bath in the window alcove with white timber shutters for sun and privacy control..... Iam' adding a couple of photos of our old Federation which wasn't protected, when we sold it the new owners removed all of the Fret work & posts replacing them with simple timber posts. The front rooms which we didn't use very much once we opened up the rear rooms into a family area. The room with the Bay window had a Baby grand sitting there, we sold the piano before we took the photo. Cheers