You Need a certificate of occupancy for an existing deck?
Occupancy permits apply when you change an occupancy or change a structure. If there is no change, the prior occupancy permit would apply.
The Kool Deck topping can be applied on BOTH fresh concrete and existing concrete with the PTA bonding agent. It is most commonly applied on fresh pours because of labor and timing simplicity, which lowers cost. Kool Deck toppings applied on existing concrete bond equally well as a Kool Deck surface applied to a fresh pour.
Building a deck takes time to do. You also need to know how much wood you need, what kind of wood you need, and how big you want to make the deck. You should start with the floor of the deck. Don't add the rails on the sides until you are sure of the width and length of the deck. Then, add the rails on each side and the front and back of the deck.
First you got to make sure that the ground is level. I would replace the concrete base of the patio deck. then you will have to decide if you want a wooden deck, structural plastic ( highly recommended ) or just leave it the concrete slab. You would need to build a base for ventilation so the wood wont rot. From there you can start building the posts and boards.
If you are looking for screened deck plans this is the place to go http://www.diydeckplans.com/catalog/special-features/privacy-screen , but if you want to know which would be suitable for an existing deck then I would have to recommend reading this article on doing it yourself http://www.ehow.com/way_5645797_do-yourself-screened-deck-plans.html .
You can find free downloadable deck plans on the web. You can also contact specific companies in Michigan than specialize in deck refurnishing like http://www.supremedeck.com/. Typically, the cost starts at 20-25 dollars for a sqaure foot. But the cost can vary depending on the existing condition of the deck and the final look desired.