Posted: 03/09/2014 at 18:22
Hi Peter - my first thought would be that it looks like it's in the shade of that tree as it's very mossy, and that's not a great place for decking.
If you want to keep the little summerhouse, perhaps you could think of taking the rest away and simply changing it to a more suitable surface and some planting. Is there a reason why it's raised up on a platform? Conditions underneath it for instance.
A few more pix would be very helpful as BM says, but perhaps you're not in the house yet! Any extra info you can offer will help though