Constructing a pergola on an existing deck can greatly enhance your outdoor living space. The process of building a pergola on a deck versus directly on the ground has significant differences. The main obstacle to overcome when it comes to building a pergola on an existing deck is the fact that instead of anchoring the pergola to the ground, you are anchoring it to the deck. The main concern is instability because you aren't able to bury the posts into the ground. However, there are ways to build a pergola on your existing deck with sacrificing stability and safety.
Use Post Bases
Your pergola will have four support posts that must be anchored to the deck. Post bases will be used to accomplish this feat. These are the main support structures of the pergola. The post bases you use will be visible, so when choosing, look for visual aesthetics as well as functionality. It is important to note that when building on an existing deck, all hardware you use will be visible to family, friends, and guests. Choose decorative hardware that matches the rest of the landscape and the exterior of the home.