Does a bathroom without a window need an extractor by law?

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In accordance with the UK Building Regulations Approved Document F, adequate ventilation needs to be provided to prevent the buildup of condensation which may damage the structure of the property. It also ensures there is a flow of air throughout the property which will maintain the air quality indoors. In short the regulations require:

  • UK bathrooms must be ventilated with either a window or an extractor fan
  • If there is only a toilet, a window alone is sufficient but in new-build bathrooms with a bath and shower, mechanical ventilation in the form of an extractor fan is required
  • The ventilation requirements for a bathroom are 15 litres per second/54m3 per house (this is the measurement of how much old air is replaced by new air and will be stated in the product description of the fan).

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