Thanks, I didn't think think of the type of water 🙂. It would be to use with a washing machine. I guess as it will be a garden room it might be best to get potable water supply then I can use it to water the garden.
I am just trying to get a rough budget together at the moment to see what might be possible and probably narrow down my wish list. Do you have any idea how much it would cost (max.) to run pipes through the roof space to the other side of a house (empty void in a bungalow). The house is only 80m2 ish. Also could these be run from a bathroom, which is nearer than the kitchen?