How to use e-signatures for Australian construction and security of payment acts?

Yes, e-signatures are legally valid for construction contracts in Australia under the Electronic Transactions Act 1999 (Cth) and equivalent state legislation. They must reliably identify the signatory and indicate their intention to sign, ensuring the contract's integrity. For construction-specific matters, compliance with state-based Building and Construction Industry Security of Payment Acts requires that e-signatures do not undermine the enforceability of agreements or notices.