construction contact request

I am about to close on our newly constructed home and I am interested in learning what it would costs to trench new lines, or add to existing poles if Comcast has leasing rights in the neighborhood. I'm in the city limits and somewhat close to an existing service area for Xfinity. I'm currently only offered DSL through phone lines from Centurylink or satelite. Neither are really viable options for me. I am insterested in learning the cost of constuction to bring new lines in.