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Hi @Pixie,
Welcome to the Community!
Are you planning to install it at a Granny flat or just merely an extension of a wall plate or wall socket?
If it's just an extension and activation of an extra socket, we'd suggest searching for a third-party contractor or a private electrician.
Thanks for clarifying, @Pixie.
Please send your complete address via private message so we can check which type of NBN technology you have and whether we can provide the service.