Hi, I like the overall concept of the darkish grey, it suits the home. I am a colour consultant and have been working with the Dulux range for 17 years and you are on the right track with the Guild Grey. The Dulux Signature will give you a dark blue house. Another option if Simone Weil which is just a bit lighter than the Guild Grey, if you find that one too dark. Sample pots and A4 brush outs onto white cardboard are the best way to decide, because computer programs give an overall impression of the "look" but are not accurate with colour choices, you can't beat the human eye. All the best, it's going to look great.

With the roof tile colour I suggested off white, but NEVER WHITE as you'd need sunglasses to enter (talk to a roof painting company). It's also a way to minimize heat by reflection, therefore lowering cooling cost and making life more comfortable, plus very aesthetically appealing. Though the down side is more regular semi pressure cleaning. I do like mid to light grey for outside timber decking or tiles under a roof line with this colour combination. For anything else as far as outside in direct sunshine, stay light but in the same hues, it can be too hot to walk on barefooted if remotely mid to dark in colour.

Can you take out one of the garden beds (front left) and do a smaller deck area to transition from the upper deck down to the paving. I think you need a much lighter colour to provide light and contrast with all the tropical plants. Agree yellow and orange are not helping create a relaxing outdoor area. You already have warm colours in the terracotta tile around the pool so a colour for the walls that cools them down, look for neutral tones in lighter blue/greys to reflect the pool. You can see the difference in the photo above which looks much lighter than in your photo with the dark brick and terracotta orange on the walls which just seems to suck the light out. Large pots can be in your favourite pops of colour to great interest and contrast. Good luck with your project.

Stick with three or fewer colours all up so I’d do the render the same as the boards. I would suggest paying a few hundred dollars for a colour consultant to get it right.