I'm having a new concrete patio installed (~400 sf) using a 4" slab and pavers. In the future I may want to build a patio cover over part of the patio (with roof and wood posts). I realize this would require footers to handle the load. My question is, should I have the contractor put in footers under the slab today or do I need to wait to see where the posts would be positioned once the size/layout of the patio cover is determined? I have a rough idea of the size of the patio cover that I want, but the actual placement of the footers is TDB. I live in the north east (NYC).