Hello
The costs for an ISDN to ADSL conversion are £50.
BT chrage this to you and it appears on your next blue BT bill after the date the conversion takes place.
If the conversion fails you will not be charged anything, this also covers the period upto 28 days after the ADSL is installed so even if you have problems with the ADSL the ISDN can be reinstated without charge.
After that its simply the ADSL subscription and setup costs (if any) due to the ISP. For example at NDO you have a choce of paying £65 setup then £19.99 a month; or paying £24.99 a month and no setup fee. But every ISP prices differently.
Most ISPs are able to arrange for the ISDN conversion to ADSL and the ADSL installation to happen at the same time, if you ordered online with us we will automatically find the next available engineer slot for your exchange and book the visit in for you. If you go via BT for the conversion you can do this, however you have to wait 7 days after the conversion takes place before the ADLS can be installed; if you go via an ISP it all happens together.
Best wishes
Doug