A Hip to Gable loft conversion usually occurs with semi detached, detached or end of terraced housing. Additionally, this style of loft conversion is usually built when a house has three separate slanting sides of its roof. The side of roof is then extended out and made vertical. This can also be beneficial when a house lacks the required space within the loft to build any other style loft conversion.
A hip to gable conversion will also allow for a more seamless staircase fitting due to the newly created space within your home. All changes made to the property externally will be fitted and matched with all pre-existing aspects of the house, allowing for an overall aesthetically pleasing look inside and out. However, if your property should require planning permission, there are other alternatives you can consider such as here.