1st floor bathroom expansion

We wish to expand our 1st floor bathroom to include a handycapped shower stall. We are seeking a before floorplan (as it is now) and a proposed floorplan so we can use them to seek written estimates from Contractors. We will have to widen the door to accomadate a wheelchair. The bathroom sits on a concrete slab so we will have to install a drane. The bathroom now has a sink and a toilet and that's it.