Start With Effective Extraction
An extractor fan needs to suit the room and move moist air outside. It should run during a shower and continue afterwards. A noisy or weak fan is often switched off, so performance and sound both matter.
Give Moist Air a Way to Move
A fan cannot work well in a sealed room with no replacement air. The door may need a suitable gap or another planned air path. Keep the room door closed while showering so steam does not spread through the house.
Warm Surfaces Collect Less Water
Steady background heat can help because warm walls and mirrors are less likely to collect heavy condensation. A heated towel rail also helps damp towels dry between uses.
Choose Bathroom-Suitable Finishes
Use paint, panels, grout and sealant made for wet rooms. Wipe away heavy water after showering and deal with failed seals early rather than covering mould with paint.