What You'll Need
Play pen balls (approx. $0.20/ball)
Wood (varies depending on size)
Foam padding ($20/pack)
Staple Gun ($20)
tarp (if outdoors, $10)
Child’s basketball net ($5)
Inflatable shark ($2)
P.S. If you're going to repost this, please be sure to include a link to the original post on my website: http://kevinjameshunt.com/ball-pit-balcony/how-to-build-a-ball-pit-on-your-balcony/ - Thanks!
Step 1: Decide On Your Size And Location
Depending on the number of people you want to fit into it, partitioning a 4′x8′ section will give you plenty of space for 3-4 people to play in, or 1-2 people to really jump around in. 3′ tall should be enough for the average person to climb in and out of. You should also consider how deep you want your balls to be. We felt about 2.5 ft deep would be enough to immerse a seated person while still not feeling like you’re drowning in balls, or without them spilling over. This calculator, which has been very accurate in my experience, will help you estimate the amount of balls you will need and the approximate amount you should expect to pay for them.