How to Build a Pool Deck Above Ground Pool Deck Plans Our deck is built around a 21 ft. dia. pool. It's constructed entirely of pressure treated lumber and features a 360° wraparound pool deck that's connected to a spacious 10 x 18 ft. sun deck. The 3 1/2 ft. wide circular pool deck provides easy access to the water, while the sun deck is large enough to accommodate a table and chairs and a few chaise lounges. As mentioned earlier, we employed a timesaving deck building method that didn't require us to dig postholes or pour concrete footings.