Ventilation Standards - Is your property meeting the requirements?

As part of our Healthy Homes Standards series, we're bringing you some more in-depth information on what these mean.


This week we're bringing you a blog on ventilation. Ventilation is the ability for air to flow through the property to stop mould and dampness, which is harmful to health ans bad for the structural integrity of a property. In the Healthy Homes Standards, rental homes but have openable windows in the living room, dining room, kitchen and bedrooms.

Kitchens and bathrooms must have extractor fans.


What is the ventilation standard?

  • All habitable rooms in a rental property must have at least one window, door or skylight which opens to the outside and can be fixed in the open position.

  • In each room, the size of the openable windows, doors and skylights together must be at least 5% of the floor area of that room.

  • Each window door, window or skylight must be openable and must be able to remain fixed in an open position.

  • All kitchens and bathrooms must have an extractor fan vented to the outside.

Kitchens – In any room with a cooktop, new fans or rangehoods installed after 1 July 2019 must have a minimum diameter (including ducting) of 150mm or an exhaust capacity of at least 50 litres per second.

Bathrooms – In any room with a shower or bath, new fans installed after 1 July 2019 must have a minimum diameter (including ducting) of 120mm or an exhaust capacity of at least 25 litres per second.

Landlords should ask installers for the details of the fan diameters, ducting and flowrate in writing, so they can show they are compliant with the healthy homes ventilation standard.

Use our online tool to find out if you need to install new extractor fans in the kitchen and bathroom of your rental property.


Use the Tenancy Ventilation tool for more information.

If you have an existing fan

Fans put in before 1 July 2019 must ventilate to the outside of the house and be in good working order, but they don’t have to meet the requirements listed above.

When they stop working, they must be repaired to be in good working order or replaced with fans which do meet all the requirements.

Exemptions to the ventilation standard

There are two specific exemptions for the ventilation standard. The information here is an overview. More information on these exemptions is available in Subpart 4 of the Healthy Homes Standards Regulations.

  1. A room doesn’t need to meet the requirements for openable windows and external doors if it was lawful when it was built or converted into a habitable space. If having fewer windows or doors was only lawful because the room met alternative ventilation requirements, then the room must still meet those requirements to qualify for this exemption. 

  2. This exemption applies to kitchens or bathrooms where it is not reasonably practicable to install an extractor fan. This exemption has a number of criteria which must all be met. We recommend landlords get professional advice and keep a copy of that advice to qualify for this exemption.

These two exemptions are in addition to the general exemptions.

General exemptions to the healthy homes standards

Ventilation is one of five standards in the Healthy Homes Standards. Keep an eye out on our blog and our social media for more information.


Blog sourced from Tenancy.govt

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