Permission needed to create canopy over decking area?

[Pinnacle]

I live in a terrace house and at the back of the house I have a single story extension. As you step out into the garden I have a 5.5m x 3.5m decking area which covers the width of the property.

With our poor weather I would like to build a shelter over the decking. I was thinking timber frame with polycarbonate sheeting.

This will be a roof only and not have any sides.

Anyone know if this is permitted or are they certain rules that I need I adhere to?

 

[mattylad]

How about a sun canopy/shade.
They are not a permanent feature like polycarbonate (and they look a lot better)

 

[^woody^]

It would fall under permitted development rules

But normally, people would just go ahead and built it

 

[RonnyRaygun]

It would fall under permitted development rules

But normally, people would just go ahead and built it

They could only build out 3m though, not the full 3.5 for it to be permitted development, couldn't they?

 

[^woody^]

That's for extensions, this structure will come under a different class