i dont really see the need for a temp pole, arnt they living in the house? Iv done several just like this. they just rip down the siding,frame up the new addition around the existing service. then at roughin install the new meter main , get temp power inspection, get poco to dig up old lateral and bring up in new meter main, then feed new ser back to old panelbox, rip out old service. the whole time the customers eating breakfast at the kitchen table. power should only be down 2-3 hrs.....now if the house is vacant I could see temp pole.