We are having a gazebo built on the end of a new deck. The deck is about 4 feet off the ground at the point where the gazebo will go and the contractor wants to use 4x4 posts dug into the ground all the way to the roof of the gazebo, to support the deck/and structure. The gazebo is 12x12, will have a double roof with cupola. With the roof I'm thinking it will be about 12' tall give or take. I know the inside will be about 8 feet clearance.
Will this be sturdy enough or should we use 6x6 posts?