Standard installation is free for new customers and existing customers who take the multiroom option, otherwise it costs £30.
The latest moves comes as Sky prepares to combat the arrival of Freesat which is offering subscription-free HDTV via satellite. Sky had already cut the price of its HD box by £100 back in June, as we reported here, and in August it announced it is adding seven more HD channels to its line-up from next month.
It's all part of a concerted campaign by Sky to keep ahead of its competitors in high-definition TV. The new Sky+ HD set-top box is made by Pace, replacing the original Thomson model, and we'll be reviewing it online shortly.
The company is also working on a new high-definition electronic programme guide (EPG) packed with new features to make it easier to use.