Beautiful building ! Depends what you need - ie if it’s a glass extension then black framed could be cool - if it’s an extension then shiplap wood could be good - either raw looking or a painted one . Trying to match the stone might be tricky !
Provided the barn isn't listed, materials will depend on if you need PP or not. You may or may not have any PD rights depending on when the original conversion was done and under what authority (PP or PD). If you have PD rights I think you have to use similar materials. If you need PP the LPA may specify materials or require you to get them pre approved. Also, there will be other differences if you are in a conservation area or AONB.
OnePlan
obobble
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