It will be 5m x 2m rectangular box.
If you imagine this as landscape shape (sorry cant add a diagram) there is a side /back door on far LHS corner of the 5m external wall and an internal door to kitchen in the opposite corner on the far RHS corner of the 5m internal wall.
We are a big busy family and this space has to work v hard. We are semi rural - so loads of muddy boots (we could build an open porch/canopy to store these outside?)......and although this isn't our main or only entrance it will be busy. Plumbing on all walls so can configure in anyway. Should I run laundry section along one 5m wall and coats and boots along the other 5m wall or split the rectangle into 2 zones?