At the time of writing this post the cost of a new phone line socked installation is £124.99. This cost applies only to homes where BT socked has not been yet installed.
Installation of a new phone line
When BT installs a new phone line, then engineer comes to your home and he fits a socket known as a line box. BT network ends at the line box. BT installs only 1 socket but you can request extra sockets in your home if necessary. However, any additional sockets will be charged for.
You can also install your own additional sockets and so you are not charged for them. Please be aware that any installation that you do on our own show be afterwards approved. Also, BT cannot offer you any free fault repair service or Customer Service Guarantee Scheme and you will have to pay for the repair.