[SmallWelshBarn]

Evening all, we have started to dig the foundations for a 3 bay open fronted hay & landrover storage ;-) barn. Its 12m x 5m wide 6m high. Original design was for a standard 45 pitch roof both side.
The lower level will be for hay etc I was thinking of making the upper level more useable for workshop or storage. Thus thinking of changing the back side pitch to a mansard to give me more head hight this is the side that no one can see as it faces in to a forest.
My question is do I need planning consent to change to a mansard (the original roof ridge hight will not change)
I'm located in an ANOB
Thanks in advance

[UPoneacre]

Did you obtain planning consent for the original design barn? If so then changing the rear slope to a mansard will be a departure from the original approved design and will require consent. Unfortunately any 'development' in an AONB tends to be a sensitive issue with planners.

[SmallWelshBarn]

Did you obtain planning consent for the original design barn? If so then changing the rear slope to a mansard will be a departure from the original approved design and will require consent. Unfortunately any 'development' in an AONB tends to be a sensitive issue with planners.

Yes I applied for planning consent, looking at the planning portal it would seem providing you are not changing the ridge hight then you don't need consent. I stand to be corrected.

[UPoneacre]

In that case my original comment applies - it's not just ridge height that planners will consider, they'll also take into account any change to the elevations including roof pitch.