During the uncertainty of COVID lockdown, REIWA has a COVID annexure to cover the most known outcomes.
This may be added as an “Annexure” to contract before it is accepted, but after acceptance, it would need to be signed by all parties of the contract as a “Variation” ie Seller & Buyer of Property Address, Contract Dated DD/MM/YYYY agree to vary the contract by incorporating the labeled COVID Annexure Z;
Signed & Dated: Seller X Buyer Y. Feel free to create your own variation.
This is not legal advice merely an information service for educational purposes, you would best weigh up the options of seeking independent legal advice to your specific circumstance.
Feel Free to ask your Real Estate Agent about arranging what suits your needs, a sample may be found here: