I am about to start some alterations and the front door is currently dark violet purple but soon to be black. I will however be retaining the natural rimu on the inside even though my kitchen walls are dark charcoal currently. I like them so much the new kitchen will have the same coloured walls. The new sliding windows in the kitchen have a pine frame so won't match the rest. I am going to paint it dark charcoal too, with the cedar sliders and rimu finishing.

Matt Black Powder coat is definitely and on trend colour and comes with a 10 year warranty over against anodised which only has a 5 year warranty. Check our our post on choosing your aluminium colour https://www.houzz.co.nz/discussions/having-trouble-choosing-your-window-colour-dsvw-vd~5385114

I you are changing from stacker to bi fold doors you should ensure that there is a single door included within one of the bi folds, preferably next to the kitchen. I wonder why you are deciding between white or black windows and doors for this room when you already have white elsewhere. What colour are the internal and external walls.

Hello, this is exactly why window treatment specialists such as ourselves exist! There are a lot of options depending on your preference for internal look. Some simple ideas such a dual roller blinds have already been referenced. You’ll have to meet with a consultant to see how two fabrics pair, especially if you’re considering one being light filtering. You can also mix treatments such as a dark roller blind recess fit to the window, and a light roman blind fit over the architrave which will give you a soft fabric finish. Alternatively white plantation shutters contrasting an exterior black window frame can actually look really stunning. It does depend on the style of the black framing you use. Feel free to post a picture of your style of window frame used and I can try to help you online Shannon -RPShutters www.riverinaplantationshutters.com.au