A pergola will obstruct light into the structure. What is the structure used for? How do you plan to use the deck for? Eating? Sitting? etc? Plan the activities and the furniture you'll need and draw up a floor plan. Floor plans are important outside & inside. The steps to the deck from the lawn are a little too abrupt. Needs a transition. Consider adding cement pavers to the grass, not as an extra patio but for a nicer transition design.

What a nice space Wisteria is so nice !! We are just about to do something to our pergola Polycarbonate roof will be fitted waiting on a man that can !! Ours looks as if its not a strong as yours We also hope to put some sort of guttering on and a water butt Down below to catch the rain water Rains a lot here in cornwall (England ) Will follow your post to see What advise others give Good luck

philjames, I'm in the exact same position right now. I have to make the decision tomorrow. I love all the light we get into our house right now and a tinted glass pergola cover may destroy that. On the other hand, i don't want an outdoor space that's too hot to use in the summer. What did you end up choosing? Would you make the same choice again?

Hopefully you found it Paul!