Thread: build a cantilever deck/balcony

We would like to build a cantilevered deck that hangs over a retaining wall. Is this possible? Where would the support joists go? The retaining wall is directly behind our house. Our backyard is basically a few feet of level ground behind the house and then it dropps off (retaining wall). We would like to extend out and create more space back there.

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Originally Posted by Marianne Shamlou

We would like to build a cantilevered deck that hangs over a retaining wall. Is this possible? Where would the support joists go? The retaining wall is directly behind our house. Our backyard is basically a few feet of level ground behind the house and then it dropps off (retaining wall). We would like to extend out and create more space back there.

Hi Marianne,

Not a lot of information in your post. The short answer is: Cantilevered decks are possible. What you can do depends on many factors.

First, I suggest you visit the Simpson Strong-Tie website. They have a section specifically on deck construction and design that might be helpful. Simpson Strong-Tie - Helping to Build Stronger, Safer Structures

Second, get a licensed and qualified contractor to take a look at your site and the retaining wall to determine how to support the deck.