Shower/laundry Room

A separate laundry room would be nicer, but the washing machine and dryer could be in a ventilated cupboard. Assuming extraction ventilation and electrics are very good, I really recommend underfloor heating and a dehumidifier if you are hanging things to dry.

My shower room doesn't have a loo. There's a double-sized shower, washbasin, heated tiled floor (lovely to stand on), dehumidifier (washing's bone dry in two hours), mobile airer and fairly large space in the middle for towelling dry etc. I don't often dry things outside, due to pollen allergies. You can hire an architect to design if you like.

They often have the washing machine in the bathroom in the Netherlands.

Would you really want to have a relaxing shower in a room with a washing machine and tumble dryer in? I've never understood the desire to combine showers and utility goods, but each to their own!