A remodeler will measure door widths, the clear floor space beside the toilet and sink, and the shower entry, then talk through who uses the room and how. In older Scituate houses, widening a doorway can run into a bearing wall or old wiring, so expect questions about what's inside the walls.
Permits go through Scituate's online-only system: building for framing changes, plumbing for the shower and fixtures, and electrical for lighting, a fan, or a heated floor. If the project is an addition or creates new living space, the town's Certificate of Occupancy list includes Fire Department and, where it applies, Board of Health sign-off.
Before the walls are closed, ask to see the grab bar blocking and take photos of where it sits. Those pictures save guesswork when a bar is added years from now.