ensimpson, Please do not render that brick. It is quite a nice brick and render can look very cheap and often done poorly cracks and looks even worse. If you don't like the dutch cables, you can go about removing them. These are not primary roof structure typically, but there will be a little work in making good the roof where they were. Alternatively, give these gables a function, place a fixed louvre, like you have shown in the attached image and allow the roof to vent through them. This will also impact the comfort of the home as there will be less heat buildup in the roof cavity. I agree with the comment above, the driveway is very prominent. This is partly the perspective of this image, but you could consider options for the driveway paving. I do not think painting grey is a good one. Repaving with a natural grey material could be as there would be more life and texture to it, but it is an expensive one.

I found these couple of pics on houzz. I like both, in the second one (if you just look at the roof line to the right of the path) It shows how you could build the front entrance out just to give the house some shape. and there are endless choices for beautiful front doors. The roof line above the door is the same as yours, and the pic shows how you could add the additional office to the right of the door. I will also add, I am a huge fan of laser cut steel maybe you could build a sort of privacy decorative shaped wall to add balance on the driveway side of your yard, ( something substantial that really stands out) and add feature plants or pots

For a 20 year old house it has many elements that are still being used today. The red roofs aren't as popular but there is still quite a few so really that could already be modern. The separate roller doors are still done but a big single is usually a preference so still up to date there. Even the bricks look very similar to what is being used. However the roller door colour and the facia colour could be changed. But really it is the landscaping rather than the house itself. The landscape is quite plain so I'd spend my money there. Have a landscape designer come in and do a design and go from there.

Ah yes, the perennial issue/question: how best to distribute/utilise budget over various project scope and in what format .....$150K it's arguably tight for this depending upon how you are intending on going about it - you'd have to be super super disciplined and there's no margin for any blow-outs/or pop-issues... reconfiguring wet areas & kitchen will stack costs up very quickly....even just doing the cosmetic/fit-out upgrades you've mentioned without changing any layout could nudge 100K.....what you need to do is prioritise your goals and then be prepared to start cutting out scope if you have a $150K limit...I'm with oklouise on this one....quite likely there's an alternative option that will arguably utilise your budget/investment better to add both more value and increased/desired living space to the home/set-up......I've seen time and time again people try and rearrange/shuffle layouts around with existing building envelopes and prove false economy with this strategy when considering what it ended up costing them...one way or another the number/cost will end up being what it will be and you'd be surprised what this could end up costing you in this format (think potentially high 200's ........more often than not I can demonstrate that a clean/clever building extension + minimal tweaks to existing will be a far better bang-for-buck option than the completely rip apart and put back together within existing footprint.....but to stack this up properly construction costs need ascertaining over various levels of trade breakdown.......