That’s a cracking job you’ve done there !

As far as I know from when I got rid of my old garage and built a new workshop is that if it’s made of brick or a material that is considered permanent ( concrete / blocks etc ) then you might need planning permission. None of what you’ve done is permanent as it essentially timber / plastic and could easily be removed.

Here you go, plenty on the net

https://www.planningportal.co.uk/inf...3/outbuildings

The only thing you’ve done wrong is make an awful lot of us envious

Norm