In short, no. If a builder, architect or drafting company has drawn up a floor plan for your new home, the designs are under their copyright. Copyright in the designs includes design ideas and concepts provided to you and by you, as well as the final set of drawings. You cannot take plans from one builder to another.
Taking copyright designs to another company for quoting/building is illegal in Australia and may result in legal action and payment of damages to the copyright owner. It will also result in your construction being halted. Having your design re-drawn by another company, architect or drafting company does not protect you from legal action.