Replace outbuilding roof

I'd like to replace a brick outbuilding's roof from corrugated metal to corrugated plastic to use as a shed/greenhouse. Its just used a shed, very old, no insulation etc and used to store garden tools and misc junk

It 3.8x4.5 meters and built into a slope. The highest point is 2.5m. The back of the building faces the pavement (altgough you cannot see it from the pavement as theres a massive privett hedge). One side borders the neighbours driveway and has windows and the structure is visible to them. It forms part of the boundary wall.

Is swapping the corrugated metal for corrugated plastic a planning or building control notifiable thing? It would be a direct swap of the sheets.

Im unclear from the planning portal if I can DIY it, or, if it will get complicated and expensive.

 

Nothing to do with planning or building control.
crack on.

 

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