Your mockup scheme is similar to our master bathroom we just completed - photo below. I know you mentioned storage being a concern - our mirrored cabinet has offered an amazing amount of storage in a very small space and also helps bounce light around. I was worried about black taps etc too so we kept chrome fixtures but added in a matte black candle and black potted orchid to create a similar effect which we can change out later on. Our floor tiles are dark but because they are semi-polished they actually bounce around a lot of light and don't make the room feel dark if that is a concern. We also have a huge fiddle leaf fig in the corner (not pictured) which adds a really nice feel to the space - a plant like that could help bring in the outside greenery in your bathroom. Instead of the storage tower you have to the left of the vanity could you do say some floating wood shelving, possibly with baskets added for more hidden storage? You could also bring in the 60s theme with what you displayed on there eg. photos as you mentioned? In regards to the window - a previous house we lived in had a window at about shoulder height in the shower - as well as letting in heaps of light it was amazing for storing toiletries etc!

You could lower the ceiling but don't forget insulation to deaden the noise, and maybe a manhole at the junction. Alternatively you could use cloth or something to make a tent like ceiling and use foam around the piping. https://www.homestratosphere.com/make-exposed-pipes-chic/

Hi there Victoria, Just trying to add a few more ideas, with a separate Pantry/Landry cupboard (this can easily be ducted and when the doors are closed very quite). Fridge and appliances all along the wall, the island can be what ever size you would prefer. It would also be nice to have a computer desk next to the kitchen by the window. I would also prefer the living area off the sliding doors to the alfresco area Bedroom 4 could have full height sliding doors coming together at the corner this can be close off or left open for times when extra space is needed for the family. And built in Wardrobes in the master would work best, just have something that blends in and looks special.

Extending would certainly be the most straightforward option and it sounds like you definitely have the block size for it! However if you wanted to stay under your existing roofline (and keep your garage!), one option may be to shift your kitchen across to the left to where the current laundry is (laundry to go euro-style into your cabinetry) and rear hallway is, it's space that could work harder. So remove the external door, then that allows a larger kitchen and importantly a larger dining area, and you could have doors (tri-folds or french doors) going out the back which would also make the living areas feel much more open - even going out onto a simple deck will make the internal space also feel larger. And I would also eliminate the door into the garage so there's at least one solid wall for the dining area, you'll have your fresh doors there to get out easily anyway. You could even shorten the wall (or make it a half nib wall) into the lounge room to make the overall space feel larger and brighter too. Of course this requires some compromise with practical things such as switching to a euro-laundry set-up, direct access to the garage etc but it'll save in staying under the roofline, keeping your kitchen connections and plumbing more or less where they are and will make more a nicer, more open living area, which is where we spend most of our waking hours! And while you're at it (!), lifting carpet and either polishing up the sub floor or placing timber (or laminate) flooring makes an amazing difference to making a space feel larger, brighter and more open. That could be a worthwhile consideration too! But of course, an extension may be the simpler option, but i do think this option could make a huge difference to improve it!