There is some exception by deck design and shape. A simple, attached rectangle deck will require the least amount of deck footings. Where an odd-shaped freestanding deck will require additional footings to support all the joists.
Let’s look over some of these factors to ensure that your deck is built to last. Quick references, easier to upgrade beam then adding footing, layout footing evenly for best results, but keep in mind the end use of the deck and adjust footings as required.