Apart from the obvious!
I have a washing machine and dryer, a good start 
I'm moving them into the conservatory. They'll be stacked in what is effectively an alcove.
The conservatory is old and crap - freezing in the winter, baking in the summer, so we don't really use it, so it does have space.
I'm quite excited* about making a new utility area. (Yes, I know this being excited about laundry is deeply sad, but I'm owning it 😅)
What do I need to make it functional and nice? What things do you have in your utility area?
I should probably say there's no sink (does that make it a laundry room, not a utility?)