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Complete or staged re-wire

Looking for a quote for rewire assistance in Ngaio Wellington. Coupled with this I will be staging a house renovation - each room will be insulated and re-jibbed at time of rewire. I'm therefore wondering if it is easier to do it all at once when we go on holiday in Sept or whether I can take it on a room at a time and transition from one fuse board to another over time. Advice and costs for each option welcome. We want to get this done asap as some of the wiring looks original - house was built in 1945.