Your landlord has a right to show the property to prospective buyers, but this must be balanced with your right to quiet enjoyment.

It may be possible to negotiate an agreement with your landlord or agent that strikes a balance between your right to quiet enjoyment and their right to inspect. The agreement should be in writing and signed by yourself and your landlord or agent.

An agreement can include conditions such as:

• your landlord or agent will only visit if they have made a convenient appointment time with you
• you will have the property open for inspection at an agreed time each week
• your landlord will provide compensation for your inconvenience

If the inspections become too frequent, you can apply to the Tribunal for a Restraining Order.

Further information can be obtained from here.

https://tenantsvic.org.au/advice/during-your-tenancy/your-landlord-is-selling/