Hi Mo,
If you decide to move any walls, doors, closet, etc., resulting in a change to the floor layout, then we would require a revised floor plan. Just changing the location of the proposed washer/dryer unit would not require a revised plan.
The HVAC permit applications are not issued immediately, like the plumbing permits, but can be submitted through the Fast Track process. If submitted as a Fast Track application, the permit can be issued within a week or so, provided that all information has been submitted.
Keri