At the “rough-ins” stage, the systems installed by the heating and air, electrical, and plumbing trades, are all competing for space, sometimes the same space!  Even with well designed systems, it sometimes happens that lines running concurrently or crossing one another can require more room than is available.  Experienced and cooperative trade partners will happily work out solutions.  When the rough-ins are complete, the lines should look like a modern planned network of highways and neighborhoods, not a medieval village where whatever sprung up is what sprung up.  Messy might function too, but order anticipates the future, where a repair or expansion can be made easier if the original work is logical and neatly done.  To a skilled tradesman, it is a shame that all their work gets covered over.

Your selections of appliances, lighting fixtures, and plumbing fixtures must be complete by the rough in stage.  Size and style of components affect placement of wiring and circuits needed, piping locations, and height of installation.  Changes to selections after the rough in stage may increase costs!