To be fair if you are serious? Chip a flake off each and get it analyzed, I know automotive do this for car paint, they have technology for matching paint colours.

Thanks Rhonda - yes it was a serious question, my apologies, I am new to this site & didn't think my question would be considered a joke. Thanks for your advice - unfortunately I only have a picture of the house from the internet - I haven't seen it in person. Thanks for taking the time to respond.

Thanks for the great advice. The cladding colour was through someone else asking a question about the picture. I have tracked down the designers of the house & will send then am email regarding the colour schem used - I am not sure how forthcoming they will be. I will definitely try a google image search. Thanks for your help

With a million variations through a million computer screens you will get a million suggestions and very confused while no closer to your answer. You have to do the work yourself and either get a colour match to a chip the min of a 50c piece or buy a Dulux or Taubmans fan deck and select a colour as close as you can. Alternately get a professional painter or decorator to use their fan deck or atlas to colour match for you and be prepared to pay them for their time.

Looks a little like Shale Grey and Windspray to me. Good luck, I hope you find out =)

So who won the competition?

Exact color won't be that much of a matter, but for sure it is in a hue of gray to white.

Yang, https://www.aucklandfencingpros.co.nz/