Permitted Development - dormer extend to gable?

[Expatman1]

I want to build an extension to a bedroom whereby one end of the dormer will be formed by building up the house gable at the side of the house so matching an extension on the other side of the roof. Both extensions are to the rear of the property, both will be below the apex of the roof and will not extend beyond the roof line - in fact they are at lest 0.8 m shorter than the roof edge at the back. The new "dormer" will be built of brick and have a hip roof to match the existing roof. I am well within the 50 Cubic metres limit.
Question I can't get answered is - can I raise the gable to act as one side of the "dormer"?

 

[tony1851]

can I raise the gable to act as one side of the "dormer"?

Yes; a hip-to-gable conversion is p.d. (subject to conformity with the usual conditions).

 

[Expatman1]

can I raise the gable to act as one side of the "dormer"?

Yes; a hip-to-gable conversion is p.d. (subject to conformity with the usual conditions).

Thanks , I am not converting the gable to a hip, just building up a section of the gable to act as one end of a "dormer". Does that make any difference?
The hip will be atop the "dormer" and at 90 degrees to the gable end i.e. facing the rear.

 

[tony1851]

Thanks , I am not converting the gable to a hip, just building up a section of the gable to act as one end of a "dormer". Does that make any difference?
The hip will be atop the "dormer" and at 90 degrees to the gable end i.e. facing the rear.

Makes no difference, as long as you dont go beyond the front-facing roof slope.