Call us today at 847-533-5529 to get a
FREE estimate on your ninja gym!
Building Strength & Confidence
Time to start booking your Backyard Ninja gyms for Summer. We do book fast so get your free estimate now.
Welcome to J.B. Builders Pro Ninja Courses
J.B Builders is the only builder of custom home ninja courses proudly providing high quality ninja obstacles and rock walls to the Northern Chicago suburbs since 2019. We have been involved with the ninja community for several years now. We have children that compete with the local and national ninja leagues so our ability to truly connect with our customers, and provide the most personalized course for them or their children. This comes from a personal and family passion for the sport. To learn more, simply browse through our site.
See how we custom build to your home
Our Services
Why Choose Us
Amazing design and two-day build in my backyard. I simply sent James a picture of what we were looking for and he sketched a design better than what we sent. The final result is amazing.
Fastidious with his work and asked me many times if I was happy. He clearly loves what he does and it shows. Thanks again to J.B. Builders/Ninja Carpenters for an awesome build!
Rob U.
James was truly amazing to work with. He was knowledgeable and open about all the choices we had and helped us build a gym in our basement in a short period of time that met our kids needs while staying within our budget. Best decision we could have done especially while indoors
Erica S.
James is absolutely amazing. He did my basement build in just 2 days, and it was exactly what I had envisioned. He was super friendly and knowledgeable. He understands the business and what the sport can do for kids. My 5 yr old loves our new rockwall. Thank You J.B. Builders!!
Joe C.
