Active job

Bathroom renovation

We are wanting to upgrade our current bathroom. At this stage we are unsure as to how far to take it but would like to know the cost difference between doing everything or just partial. Will be at least a new shower over the existing bath with swinging door, new vanity, new vinyl flooring and new wall linings. I have a plumber in mind but am happy to use another if you prefer and is cost effective. We have bad water pressure so job may also involve the change over of hot water system from electric to gas (already in house) but again depends on cost. So someone who can take care of this also would be preferred.