Thanks for your comment, I didn't think about the top floor thing.. I wouldn't do anything without prior approval. We are just at a stage of getting ideas only, and understanding who does what. I guess I thought we could use the existing plumbing in the kitchen.

Look into getting a copy of the actual floorplan from council which will give you the real dimensions etc, there are amazing toilets that can be connected to normal sized waste pipes, which are used in situations like yours

Thanks @siriuskey that is a great suggestion.

In the meantime a possible idea for you?, using the kitchen plumbing for the ensuite and the laundry plumbing for the kitchen , open up the wall between the new kitchen and living. Move the washing machine into the bath room. Without actual dimensions this is guessing. Talk to a good plumber and then to the body corporate. The toilet I mentioned will be a bit more expensive but will work with existing plumbing

@siriuskey That's actually seriously good idea. Thank you soo much for taking the time and effort to provide me with this advice! Your comments are very helpful.

What kind of professional I need to consider to do this kind of work? Is it an engineer, a builder or kitchen/bathroom renovator.?

I would suggest at this stage, a good plumber & Builder. We stayed in Lovely old boutique hotel in New Castle that had a reno and had to add ensuites to their rooms, they used the toilets that I have suggested you could get your plumber to check out

https://www.saniflo.com.au/71-external-macerator?utm_source=google&utm_medium=paidsearch&utm_campaign=australia&utm_term=externalmacerator&gclid=Cj0KCQjw_OzrBRDmARIsAAIdQ_JCiY18_RHaYCy6ps0phmCEK6p0VSVXz_8eD9hUqUGaFdh1NAjbIXEaApioEALw_wcB

The examples shown aren't inspiring, but these units can be built/boxed in

Very good suggestions. Thanks

@siriuskeyHow much do you think the the estimated cost will be for the suggested renovations above? I know it is a hard guess but having an appoximate idea will help. We bought the unit to live in not for renting, so we are probably going for mid range materials and equipment.

It won't be cheap but it's best to have an overall plan before starting any renovations.Removing walls will add to the cost but also the overall outcome. Start by getting quotes, from a couple of builders, Plumbers and Kitchen and bathroom companies, The Builder and plumber would need to do an on site inspection but the kitchen bathroom should be able to quote off the plan. Once you have all the info approach the body corp, I'am sure that there will be others wanting to do updates to their unit which will help your cause. I can add dimensions to my plan to give the kitchen and bathroom people an idea of the space available but it won't be exact having had to take dimensions off your posted plan. I really think adding a second bathroom will be money well spent. What city are you in, the awnings sound lovely but my preference is Vergola style opening and closing, but you would have to get approval from the BC as to what you can do.

The unit is in Ashfield, Sydney and since we have never owned a unit these things are blank for us, so we are just starting to learn. I will contact strata this week to ask for the blueprint of the unit so we can have the exact dimensions.

I have checked photos of other units online to see what they have done and it seems they have kept the outlay as it is, so it seems just bathroom/kitchen renovations have been done. But it's worth trying..

Adding dimensions to the plans above would be very helpful for getting quotes, so at least we know what to expect. So yes please! Thank you so much for your assistance and advice you are very kind.

Ashfield is a great suburb, congratulations, I will get some dimensions to you

depends on how often you need the extra bathroom and how much you prepared to spend? (i'd expect a modest redecoration of the old bathroom to cost about $15,000 without changing the location of any fixtures, a new kitchen about $15,000 and the second bathroom needing new complex plumbing, new walls and unexpected extras to cost at least two or three times as much if not more (assuming the BC agrees) and, where will you do your washing?.. contrary to other ideas i would prefer to keep a laundry without the second bathroom but removing part of the wall between kitchen and living area would allow for two options for a new laundry "cupboard" and a more spacious open plan kitchen, dining and living area at a fraction of the cost of the second bathroom...(say $40,000 for new kitchen, Euro laundry, floor coverings etc) my concern with the extra bathroom is finding a connection for the new toilet into the sewer which would probably involve digging a trench in the concrete floor to bury the pipe to connect the new toilet to the sewerage under the existing toilet ..my new kitchen and Euro laundry without relocating plumbing

but, if you are prepared to completely rebuild the old bathroom and kitchen and rearrange walls this idea adds an extra bathroom in an easier location

The plan showing rough dimensions taken from the one you posted which has inconsistencies. It will be good to see the one one you get from the BC.

My new ensuite bathroom uses the Mascerating toilet system as linked above so no need to dig up concrete floors all three items WC shower and toilet connect to it and it then uses the old kitchen waste to remove any bathroom waste, the old window ventilates and gives li ghtinto the ensuite. Likewise the Island sink will use the old laundry waste and plumbing. The Washer and (dryer) if needed should fit into the old shower space in the bathroom using that plumbing and waste, another hand held shower can be over the bath. The bath is also very good for large soaks and by adding a hotel style pull out clothes line is great for drying,

This floor plan is cost effective by using original plumbing ,doors and windows

I can guess at cost but would much prefer you get local professionals and as many as you like to give you the actual cost. Ikea and Bunnings are also great for Bathrooms and Kitchens. I would be happy to look at any kitchen bathroom designs showing details

@oklouise Thank you for your suggestions and Insights into possible costs. That does help. I know open kitchen makes the Living room more spacious, but this won't work for us as we do some serious cooking and I like to keep the smells contained in the kitchen.

@siriuskey Thanks for the updated plans, that will definitely help. We will start by talking to strata and getting quotes and we see how we go.

I came up with another idea that requires minimal wall removal and may be more cost effective. The dimensions are of course not correct, it is just to present the design idea.

In this design the laundry is turned into a bathroom and the door to the kitchen is moved forward. In the space in front of the new bathroom I was thinking of adding a storage cupboard.

Anythings possible with BC approval, I would sit on my hands and live in your new unit for approx 12mths before deciding what to do cheers

That sounds reasonable.. Thanks

Look forward to seeing your post when you have decided what to do