The pipe that exits your house is called a drain. If this drain then joins a drain from another property, the pipe becomes a sewer from that joint onwards.

Private property

On private premises the owner is responsible for their own drains up to their connection with drainage from another property - even though that connection may be under the road or under neighbouring property. Ownership of drains does not stop at property boundaries. If an owner is unable to clear a drain by their own efforts then they need to call in a drain cleaning company. These can often be found through their adverts and listings in business telephone and internet directories.