The Conveyancing Act sets out all the relevant information that must be disclosed by the seller of a property. Most common documents are the folio register, environmental planning and assessment certificate, diagrams of the sewerage system on the property, and evidence of any restrictions to the use of your property such as footpaths and roads that are shared with neighbours. These documents should be attached to the sale contract. Failure to disclose this information means that the buyer may be able to terminate the contract and you may be liable for costs incurred.
Find more information here.