I can confirm what most of the above posters have written, We got our new build connected to the network last year.
Our builder ran underground ducting, with a metal wire inside it, from the house to the site boundary. The main phone line is across the road from our house and Eircom erected a pole adjacent to the opening of the ducting to take the phone line across the road.
They ran the line down the pole and into the ducting using the metal wire to pull it through the ducting up to the house. So have the ducting in place and Eircom will take care of the rest. They connection fee was about €125 if I remember correctly.