This image looks like the house may have been built in the 1960’s; it reminds me of my husband’s childhood home. That era would be a great place to start for inspiration. Richard Neutra is a great starting point - the basic form of the existing house would lend itself well to an addition with a master retreat, perhaps overlooking a semi-private courtyard to break up the rectangular shape of the house. Refer to this site for further insp https://takesunset.com/2011/05/vidal-sasson-renovates-neutras-singleton-house/

Note also that you will need to confirm restrictions on boundaries, council regulations & NCC etc

what is the width and depth of the block, the distance of the external walls from all four boundaries, where is north on the plan, describe your climate and what do you like and dislike about the house and how do you use all the paving at the front?

It's. 1500 m2 block we don't use the paving at the front for anything at the moMeMT. This front gets the morning sun. I was thinking about extending the end 2 bedrooms, creating a hallway through to a double lock up garage where the carport is and building a master retreat on top of that. The boundary fence is just behind the carport. Maybe bring the carport round to the front end of the house. Argh I'm confused.

confusion is normal but how far is it to the rear, side and fron t fences we need more info to be able to make suggestions ...adding an upstairs would be my last resort as a lot of space is needed for stairs

7 meters from this front of the house to the side. 3 meters from the carport to the front retaining wall. The rear of the house has a patio then drops down to a pool then 15 meters to the rear fence line.

The bavk of the house is 5 meters from boundary fence

Thank you for sharing your ideas. It helps a lot to visualize something. It's a much better solution then building upwards.

Love the ideas. Thank you.

would be glad to make a more specific plan for you but if the whole block is 1500 sq m there's some space missing somewhere as this approximation isn't big enough...do you have a site plan and/or can you see what's missing from this rough estimate??...what is the correct shape of the block and the length of each boundary as this idea needs about 8m from the front door side of the house to the boundary for the new garage to fit as shown

It has taken me a couple of reads , but like OkLouise , I think the driveway comes down and takes a 90* turn into the carport ?

The next question I would ask is what are you trying to achieve ? Do you need a 5th bedroom ? It would be expensive doing an upstairs one , especially with the existing roofline , but also doing one as part of a new 'building' would also be expensive . While I like OkLouises idea , my worry would be cutting out light to the lounge and living area .

A couple of suggestions then -- Suggestion number 1 , assuming you are happy with 4 bedrooms , but want an enclosed garage and a second bathroom , would be to either move the carport forward ( it looks like it is steel framed ? ) OR get a couple more frames done , then close some or all of it in , having had water and waste added to the 'extended' ( what I call the rear ) part of the floor . This gives you a garage or a workshop or lockable storage , PLUS a washhouse ( as a room , or as part of the larger area ) . THEN you can turn the existing WC 90* , and convert the 'entrance way' to the existing bathroom into a shower -- both incorporated as an ensuite to the master bedroom .

The existing bathroom and ex-washhouse can be reconfigured ( it looks like non-load-bearing walls , so relatively easy to move doors ) into a new bathroom and toilet area -- most water and services are already installed -- you may need to get a concrete cutter to add a second WC , maybe to move the shower waste ?

Suggestion No 2 is if you do want a 5th bedroom and enclosed garage would be similar , but add it all at ground level , using the existing carport as a basis . That way you can add a bathroom , possibly a laundry too , and as per suggestion 1 you could end up with 2 or 3 bathrooms ( your choice ) and essentially a 'granny flat' -- that probably makes the resale better too . To try and reconfigure the existing interior , try and add doors through existing exterior walls , demolish existing walls , try and add a longer hallway , try and extend bedrooms , even to add to that existing roofline , etc , etc would be quite expensive for what it would achieve IMO . Of course , if it is going to be a long term house , then go for it , remodel to your hearts desire , but if you want to try and recoup the maximum in a few years , you need to think what would a purchaser be looking for , and what will they pay ?

Thank you @pottsy99 great ideas and we definitely want to use the exsisting carport to close in. Love hearing everyone's different take