We did a similar thing. We originally had a verandah (so the hardwood floor, roof and spindles with handrail around). If the heavy rain came at an angle the floor got soaked so we put a new roof on and filled it in. Some doors are bifold so we can open them in the heat. We put down sisal natural flooring direct on the hardwood floor (the floor has some small gaps and is not butted up length to length) and it has proved a great investment. Here’s some pix

Hi Daisy,

Your old lean-to looks amazing, very similar to what we will be doing. However I want to cover up the decking with wood flooring (chipboard tongue and groove) then carpet it. What I was worried about is whether the decking would get damp under the flooring and end up rotting both. I really want to get rid of all draughts from the floor and heat the room in the winter so we can use it then too. It gets pretty cold up here in Scotland so I am insulating the walls and roof and fitting double glazing.

What’s under the decking? That will detrrmine whether it will remain dry We concreted under ours

Its a void about two feet deep

I think you should be fine. You will have the wind blowing underneath to keep it aired. My old carpet was seagrass and that had a latex backing so perhaps look for something similar. We use our ’garden room’ constantly from spring to autumn. It was a good investment for us.