the wooden floor makes it so much easier to consider moving plumbing and i'm wondering if moving the kitchen next to the laundry has been considered to enhance the indoor outdoor feel with a servery window and use the old kitchen meals area as a sitting tv area (with or without a means of closing off the area) and square up rumpus room and include the old entry to enlarge rumpus and create a new entry more centred along the verandah, having the new walls around the rumpus would allow for sound insulation and the two sets of doors between theh rumpus and living areas should improve separation without losing the separate study (guest room) and access to the other bedrooms and bath...accurate measurements would allow better consideration of this idea

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.

it makes much more sense to plan the whole house at the same time even if you have to do the improvements in stages....you may find that moving that central doorway is the key to improving everything else but that won't be obvious without original plans for the whole house and what is the shape of the roof, what are the existing roof, walls and floors made out of, is the house on a slab or is there crawl space under the floor, does the land slope in any direction, what made you decide on the size of the proposed extension, what's the distance from the sides of the existing house to both side, rear and front boundaries, is there an existing garage, where is the laundry and drying area and do you want a deck and/or outside entertaining area? all necessary information to make any worthwhile suggestions and probably more questions to come and imo the key to a good renovation is understanding what you already have before adding extra space,

I would do sink on back wall in front of window. Stove on the side wall that has the window. Could do 2 windows either side of stove. With stove on side you can still chat whilst cooking. Tall storage on opposite wall and fridge