Can you add more dimensions and is the house single level

House is single level. Not too sure what the other measurements are. Kitchen is around 3.6 x 3.6

Thinking I could square it off from the end of laundry and continue out from the bathroom.

do you have more of the floorplan, and what is the structure built with etc.

even width of passageway and google earth shot of the roof

If this helps. I have the measurements

Hallway measurements:
W: 135
L: 9614

The back section is a 1950 style lean to. I wanted to avoid a full knock down and rebuild. So was hoping to work with the existing. It’s not the best insulation so I don’t know what the beast practice should be as it’s made from weatherboards.

That’s the back lean to

Looks like a wonderful old house and love the fence ?

Thanks. We let some local graphite artists do their thing. Colourful and fun.

Extending the “back and sides” and “square” off will cost more than moving the kitchen. But I’d leave the kitchen where it is and open up to the dining. I’d take some room from the lounge to create a hall (with storage) to the bathroom. I’d replace the sunroom with a deck. And add big sliders from the dining room to the new deck. You’ll find it hard to get a builder to work on the lean to and sunroom/laundry structures so if you want to keep them you’ll need to minimally touch them.

And a toilet “in” the house would be a good idea. And a kitchen can become a bathroom. You don’t need to keep that kitchen as is.

attempting to extend out the back would require a completely new roof as the existing slope and height of the sunroom ceiling would not be tall enough to allow an extension at the same angle and be very expensive for little gain...my suggestion would be to sacrifice the smaller bedroom for a new bathroom and internal toilet, add the old bathroom space to the dining area and add a wider opening to the kitchen to create a more spacious family dining room without changing any external walls but details depend on what you want for the whole house but something like this might work

and "best practice" would be to add insulation to all walls and roof, install double glazed windows and repair and paint all the old weatherboards, roofing and gutters and repair and/or renew all the old electrical wiring and plumbing

Never thought of this. Fair points. Hesitation around loosing that bedroom though. The front section of the house has been fully restored, just struggling to think of best practice without a full knock down and rebuild.

But most suggestions is to do that, as builders said it’s harder to work to current specs of an old existing structure.

builders will usually advise what's easier and quicker not necessarily what's more economical but an old house will need lots of tedious work that can often be achieved by an enthusiastic handyperson but, what is your goal for the whole house?...a four bedroom house would normally expect to have two bathrooms but what do you need and want? there's no obvious solution that doesn't involve demolition and rebuilding of at least some parts of the old sunroom, dining and kitchen to achieve the necessary ceiling height but if you are considering an extension there will be other ideas but can you advise the width and length of the whole block and distance from sunroom to rear boundary

Cheapest option is to take space from dining and create a hall to bathroom

And I assume there is a toilet somewhere

there's a WC in a shed shown on the site plan shown 2 days ago from Chris

This is an old floor plan. There is a toilet in the bathroom LOL. And we took down that kitchen wall to bring in more light and create an open space. So those sore points have been addressed. It’s still a 1950’s kitchen etc, ready to be modernised.

The second bedroom on the left will most likely be turned into a walk in ensuite when money permits. But would rather focus on the back section next.

Saw this, and was thinking it’s something like this I could achieve.

all depends on lowest height of ceiling and roof of your kitchen, dining, laundry and sunroom and Google Earth image of the whole roof and width and length of the block...we also need a rough hand drawn sketch showing the actual location of the internal toilet, bath, shower and vanity and length and width of the bathroom... we can't make realistic suggestions without answers to questions and correct information

If budget is no issue, this could be a good option. An Attic-style bedroom can be added to gable extension if planning control permits. Good Luck!

Never thought about putting the main bathroom in that second room. Nice.

Top view - 512m2 block

As your overhead photo and back of house photo show your roof line is two hip roofs, joined in the middle. Not the same as what Jan M has drawn. Therefore a adding a gable extension is not possible with current original house roof pitch. I would stick with a sloped roof as what you already have for any extension work. The problem you have is the legal height of ceiling allowed for habitable rooms. Usually 2.4m average. You can not extend the current roof, over kitchen area, at the same angle and keep that legal height.

Your inspiration photo is good, but the roof height looks a lot higher than what yours would be.

..

This will help,

https://ncc.abcb.gov.au/editions/2019-a1/ncc-2019-volume-two-amendment-1/part-38-health-and-amenity/part-382-room-heights

After seeing the google earth shot showing that the laundry is not as per the plan and missing dimensions, I suggest this following basic idea. The kitchen roof continue to depth of sunroom hoping to arrive at around 2100, if not raise the sloping roof to gain the height needed, inserting glass panels in the new space.

Move kitchen to use existing bathroom plumbing and add a shower/mudroom/laundry in part of the old kitchen space. this would also be wonderful for bathing your two pups.

A spacious family bathroom added to the rear bedroom, working with maintaining walls, fireplace and door, which saves money not having to patch ceilings etc, this room shows a skylight. which would be lovely.

I’m not sure what you’re actually trying to achieve. What type of budget are you looking at? Is there a step down to the kitchen and another to the sunroom? Do you really need the extra square meterage of the sunroom?

Something else to consider with the sunroom becoming a flat pergola at the same level as the kitchen family

I think you need an accurate plan with all areas dimensioned. Looking at the photo it looks like kitchen dining bath are an addition and the sunroom and laundry are cheaply tacked on the outside with lower roof again. Are the floors level and structure sound?

If you look at the exterior wall the kitchen dining bathroom are original it was common to do the lesser utility rooms like this, The sunroom could have been original also. Floor level could be the same in the front and kitchen but it would help ceiling height if the kitchen stepped down