Skip to content Skip to search
My Norwich

Damp, mould, and condensation

What causes condensation?

Most homes are affected by occasional or persistent condensation at some point. The three main causes of condensation are:

  • moisture produced by everyday activities
  • not enough ventilation
  • cold temperatures

Everyday activities like cooking, drying clothes, showering, and even breathing, all increase moisture in the air. If this moisture builds up, damp and black mould can grow on walls, ceilings, furniture, and clothing and raise the risk of respiratory health problems. 

How much moisture can be produced in your home in one day?


Number of pints

Two people active for one day


Cooking and boiling a kettle


Having a bath or shower


Washing clothes


Drying clothes


Total amount of moisture that can be produced in your home in one day

21 pints

Ventilation will stop moist air getting trapped in the home

  • Open windows and air vents and turn on extractor fans to prevent condensation.
  • Most of our council homes are fitted with energy efficient extractor fans and they cost a few pence each day to run. 
  • The extractor fans remove moisture from the air, and some have a ‘boost’ function which turns on when moisture is at its highest, such as after bathing or cooking. 
  • It is very important to leave extractor fans turned on to help keep damp and mould out. 

If your council home does not have extractor fans, contact our Damp and Mould Taskforce on 01603 989656 or email

Feedback button
Feedback button