There was no vent in the main bathroom in our house. We had another bathroom upstairs as well as a master bath for our bedroom. However, this one downstairs had a shower that got a lot of use, but it did not have a vent. Over the years the moisture allowed mold to start to form. I called a company that does bathroom remodeling in bergen county nj to give us an estimate on totally redoing that bathroom.
We wanted a tiled shower instead of a shower stall. We also wanted storage for towels and a much bigger medicine cabinet. The sink was also too small to do much of anything except wash your hands, and the toilet was weird. It was really small. You felt like you were sitting on the floor when using it. I was happy with the cost estimate for renovating the bathroom, especially since we picked some really nice things to go in it.
We were adding a heated floor under the ceramic tile. That would definitely make it cozy in the winter. The venting was the main issue. The bathroom was not located next to an exterior wall, and the space above it was a bedroom. The vent needed routed through another room and then to the outside. You have to purchase a special vent with a different blower when this happens. The blower actually goes closer to the exterior vent. It pulls air from the bathroom and then pushes it out the rest of the way. The benefit is that the vent is silent in the bathroom. You do not hear any fan running.
The new bathroom is incredible. I am amazed every time I go into it. There is now a place to put everything. We even have a place to sit and change out of dirty clothes and into clean clothes. A laundry chute leads directly to a basket in the basement next to the washer. It is really neat and convenient.