Wording a little ambiguous. Roots of the house? I presume you mean that the hedge (or, rather, line of trees), might cause a problem with the foundatons of the house? Is the hedge 24 - 30 ft tall, or long? If it's only a standard hedge, say 6 - 7ft tall, it'll be fine, and so will the house. Phil J

Agree, regular pruning of 6-7ft hedge effectively restricts the roots spread and vigour. They are not supporting a huge canopy so don't need to match it in size which they effectively do if the trees grow to their full unpruned potential.