Snap Sirius!! I just came from a meeting with a colour consultant at an inspiration store, lol! The consultant loves the choices as is. She liked Whisper White for the window frames and said the Surfmist windows on upper extension will be harmonious with them. She suggested Woodland Grey for rear extension roof was modern and felt leaving the tile on the original home was fun. She suggested Gully for the outer frame of window and baseboards, Woodland Grey for gutters with Whisper white for the Fascia. Gully for garage and base extension render with timber windows she liked too. So I guess, sorted? She thought a blue, teal or orange toned front door with the wire door sprayed in Woodland grey. She thought my gold ceiling room facing south could go with Hogs Bristle well, I might do that half strength though...

What a cool house design! Off the top of my head, I think I'd be inclined to paint the brick surrounding the sliding door (1st image) and either paint the pillars or clad them in same timber as the ceiling just inside that same sliding door (1st image). I'd be tempted to leave the large wall as bigreader suggested simply because it's such a magnificent feature. If you live with it for a while then still not loving it, then paint it. While I like the chandelier, it doesn't really suit where it is, as Warren pointed out. If you wanted to change, best to consider if there are any other electrical changes you want to make and get an electrician out only the once. As far as paint colour goes, do you know what the current wall paint colour is?I'd paint to match the wall colour and complement the carpet, but important to know if you like the current colour or want to change. Also it would help to know what your own plans for the interior style is. Do you want to remain true to the 80s with just a few tweaks, or change it completely? About the balustrade, do you want to change the colour of it as well? Is it also made out of glass (couldn't quite tell from photo)?

siri - re boundary construction it of course depends upon the specific context - the issue in this case is the site fall and being on the high side there could be potential issues of building heights from the NGL on the neighbour's side....my comment was also in respect to considering a terrace structure above a close to boundary structure and complexity that would be thrown up with screening and structural offsets etc.....and this is sometimes worth pursuing where space is tight, however I'm anticipating here there is a fair bit of room to move and I'm guessing (an educated guess based on limited contextual information provided ) that a more cost effective/simpler option on a number of levels will be to (a) keep things off the northern boundary and (b) minimise renovation scope and consider a strategic rear extension that focuses on master bedroom zone and cleaning up the main living zone - if the majority of the existing spaces are retain structurally and limit renovation to cosmetic upgrades then the budget will stretch a lot further but net result is a more valuable property - and a more cost-effective value adding proposal that on paper is more likely to be accepted for finance.........this is always a integrated numbers game/exercise We're working on a job at the moment that we crunched numbers on various options & scope/configurations, but the two "shortlisted" of them were very similar - one slightly more expanded and pushing out to boundaries, the other more tightly disciplined, simpler and deliberately keeping building extension off boundaries. Whilst both of the shortlisted proposals essentially accommodated/covered the client's requirements outcomes, we estimated approx $100K accumulative difference one way or the other........

If you look at these photos of your home and a comparison photo. Okay, the photos of your home may not be as neat a job, but the work completed is the same. Only difference with gutters, as mentioned by siriusky is the placement of the gutters on the boundary wall. But if a down pipe is required for this side of the home, then that ,is maybe why they have completed the job with the gutters along the wall not on top. An inspector will check everything and give you piece of mind. But the job may of been done correctly in the first place?