Unexpectedly to me, due to it's location on the crest of the Great Dividing Range at an elevation of around 700m above sea level, Toowoomba has a climate more similar to Sydney than Brisbane. With average summer highs of only 28°C, & average winter highs of 17°C (lows of 7°C & cold wind, as has been mentioned). It's located in Climate Zone 2: Warm Temperature, the same climate zone as Sydney, not Brisbane. Though this climate zone is very varied, so care must be taken to cater for local conditions. As has been advised a few times, have a good read of the Your Home site. Read this section, Designing for Climate, for zone 5: warm temperate. http://www.yourhome.gov.au/passive-design/design-climate Along with having cooler temperatures than Brisbane, the fact that Toowoomba is inland means it has greater variation between daytime highs & nighttime lows (diurnal temperature range). This means that unlike Queensland coastal climates, some thermal mass in the home will be appropriate, so a lightweight structure isn't needed. Although a lightweight structure, on a ground-coupled slab (with polished concrete or tiles in North facing living areas) would be a good idea. As the temperature is so much cooler than tropical Queensland climates I'd advise against going too overboard with a pavilion style house. As I think it would be too cold in winter. Maybe something like two off-set rectangles, joined in the centre. Kinda like dreamer's inspirational picture, without the middle section, the two rectangular sections joined. Or just go for a more traditional rectangular house. In any case, like just about all Australian climates, you should try to build a house that is generally rectangular, the long sides facing north & south. This will give an opportunity for northern sunshine to enter home in winter, while the shorter eastern & western sides will limit the effect of hot summer western afternoon sunshine. Though I guess this house shape won't look great from the western road, as it will look very narrow from here. You could fatten it's street frontage a little bit, by having the garage to the south of the rectangular house. With such a large block you'll be able to build something that works for you. But as OKLouise said, don't just pick a plan for an average narrow block. The plan you picked is not really suitable for your block. I'd also recommend you do a lot of research yourself. As has been shown with the plan you've received, you can't rely on the builder to design a plan that will work best for you, that is appropriate for your location. So read up on the Your Home website. It's an invaluable resource when it comes to building a comfortable, energy efficient home.

I'd say it's an easy min. $250K minimum flagfall on a relatively basic/not fancy spec/fit-out in a super good package deal. You're essentially renovating an entire house including moving plumbing, walls replastering, new floors throughout etc....not to mention lights, rewiring etc etc, it goes on and on.......This scope would still cost a builder themselves $150K, not factoring in their own time/labour, paying cash for sub-trades and getting super deals on all materials....and then you could only really potentially roll this type of operation out if you actually have the money in the bank. If you need to borrow then you'd need a building contract which then brings in market rates, profit margins and GST. Take profit and GST out from $150K and there's barely enough left to cover materials alone, when the labour/materials ratio (of a construction cost) these days, particular for renovations is labour being the most significant cost involved.............you can fine tune and perfect a floor plan like you have (which I reckon is pretty good as a plan), but when push comes to shove it always comes back to budget and costs, which is why we always are encouraging people to utilise design professionals who manage the challenge of designing within budget limits. If you separate budget/costs from the design process (rather than integrate it) more often than not it will leads to disappointment and misalignment of your expectations of what is realistic.

anything is possible with enough money but with such a modest budget you might achieve the new bathroom and kitchen OR the extension but it would be difficult to achieve both at the same time but you haven't answered the questions??? what is the distance from the house to the back fence, what are all the floors, walls and roof built out of (ie inside and outside walls, concrete slab on ground, or is it a timber floor with crawl space underneath the house?? and NB where is north? ...what is the shape of the roof (hip or gable tiled roof or??) ...do you have an aerial photo of the roof like Google earth??...extending over the retaining wall shouldn't be a problem with proper cosntruction and there isn't anywhere else to go without losing the best outdoor area that has easy access to inside...the extra lengths of pipe isn't the biggest cost of new plumbing and a ventilating skylight will make a great light source for an internal bathroom...

Am so pleased for you, Lucy. What a lovely home and it very much suits its gorgeous setting. Love, love, love the use of timber, and all that glorious light. I now also have a serious case of dining chair envy. And the view! No wonder you’re (rightly) pleased. Health, happiness and many, many years enjoying the fruits of all your hard work to you and yours And to all the lovely Houzz community members who helped Lucy, and myself, cheers you wonderful people