Oops! Your trim looks grayish blue to me. Sorry, didn't see it is charcoal until afterwards...well in that case, I think I would still do gable and wrought iron as mentioned but then try a bright yellow, like SW's BEESWAX is paint color. Are you in the islands? Sorta has "that look". Envy : )

This just popped up , but I see it is quite old . Did you decide on paint colours ? The roof looks almost a brown tone in the photos , but you say it is dark grey . I assume you don't want to paint that ? If you do , go more charcoal IMO . If you don't , I'm assumimg it will look several shades darker with your wall colour choices . There is a roller door on the garage that appears to be a nice shade of orangey yellow . Personally , I would go with your colour choices , but do all the doors ( roller doors , wooden doors ) and gutterings in that ochre shade . Your terrace I would do in a charcoal , but with the top rail either in the orangey yellow , or a really crisp white . I know that sounds a bit 70's ( although they would have added a lot of ranch brown back then haha ! ) but against the light grey I suspect it would work together well , and look the part .

I don't know how hot it gets in Auckland in summer (I've only ever been to NZ in winter!) but if it gets hot, then go for a pale colour. Dark roofs should be kept for cold places!

First of all I would like to say it looks like your parents have brought a lovely looking home. The colouring of the outside of the house it typical for it's age. I would like to suggest that you stick with a light tone for the outside but is the Yellow / Cream isn't working then perhaps consider going for a White with a tiny tint of pale green .... this will blend in nicely with the garden, window joinery and roof but it will not be stark white. Internally I am a bit of a cream on cream kind of a person because I like to add colour through my furnishings, knick-knacks etc but I have to say I did move into a home with a mint green carpet which suits my personality but is not all together practical with pets coming and going and a lounge painted a medium to dark mint and I really love that colour. Originally the hall ways and other room where a butter / cream and just making it a off white really boosted the light and spaciousness of the home. The lounge is still the same minty green and I think I will repaint it a similar colour as it is very relaxing and "natural". So go for something that is restful inside and something clean and almost white outside. Hope that helps.