You must, by law, have a four sided fence around ANY pool that can be filled with more than 30cm of water. This includes inflatable and portable swimming pools.
Pool owners should regularly check their swimming pool throughout the year, especially in the months leading up to summer. Fines can apply if your swimming pool does not comply. If you are not sure whether your swimming pool complies with the legislation, you should contact your local council to arrange an inspection or The Swimming Pool and Spa Association of NSW and ACT (SPASA) for more information.
To find out what council area you are in or to access a list of authorised accredited pool certifiers, please visit The Office of Local Government.
New changes to backyard swimming pools
•As of 29 April 2016, all residential properties with a swimming pool must have a valid certificate of compliance before the property can be leased or sold.
◦For rental properties: the landlord or real estate must give the tenant a copy of the valid certificate of compliance or occupation certificate
◦For sellers: the contract of sale must include a certificate of compliance or an occupation certificate issued within the past three years & evidence that the pool is registered. Alternatively, the vendor can transfer the obligation to the purchaser if a certificate of non-compliance is attached to the contract of sale. The purchaser will then have 90 days from the settlement date to fix the defects listed and obtain a certificate of compliance.
(Above Taken from https://kidshealth.schn.health.nsw.gov.au/swimming-pool-fencing)
Follow the below link to read more https://kidshealth.schn.health.nsw.gov.au/swimming-pool-fencing