Litter pans are a problem. Especially when you have a large cat who can't fit in a small litter box and a dog who considers cat poop a delicacy. It's been a struggle to find a commercial litter box the cat can enter and the dog can't.
On average, the cost to have an above ground pool deck professionally installed can range anywhere from $2,500 to as much as $8,000. The costs really come down to the type of material being used, the size of the pool, the design and contractor building the deck.
1 The cheapest option is a vinyl liner pool. For a basic, medium-sized vinyl liner pool with no patio prices start at around $18,000 and can go as high as $30000+ including installation.  The next option is a fiberglass pool. Materials alone cost between $10,000 and $30,000 based on the swimming pool size.