Where it starts
A laundry is planned around the machines, the drying and the sorting, so it stays tidy on the days it is busiest.
A laundry is the most used and least designed room in most houses. The washing machine goes wherever the plumbing already is, the dryer goes on top of it, and everything else ends up on the floor. Planning it properly takes half a day and pays for itself every week.
We start with the machines, because their positions are the one thing that is hard to change later. Side by side under a continuous bench gives you the most usable surface and lets you fold in one place. Stacked frees up a bay for a tall cupboard, which is the better answer in a narrow room. Either way we build the cabinetry around the actual appliances you own rather than a generic opening, so there are no awkward gaps down the sides.
Then it is the parts of the job that never get drawn. A drying rail or a pull-out rack for the things that cannot go in the dryer. A sorting drawer or two baskets under the bench so the washing is not sitting in a pile. A trough deep enough to fill a bucket without hitting the tap. A broom cupboard that is genuinely tall enough for a broom. It is not glamorous, but it is the difference between a laundry you use and one you close the door on.