What size building works best for an indoor trampoline park?

A minimum of 18,000 ( 1672.3 m2) square feet is a good estimate as to what size building you will want to secure. 

Are there any standards for the indoor trampoline park industry?

Yes. the original board members of the IATP came together to develop the ASTM F2970-13. If you wish to obtain a copy of the ASTM F2970-13 please visit www.astm.org 

What is the ceiling height required by the ASTM Standards?

17 feet (5,1816 meters) measured from the slab of the floor to the lowest obstruction in the building. 

What is the average size of a trampoline park in the United States?

Most parks average between 25,000 and 35,000 square feet. (2322.6 - 3251.6 m2)

What is the preferred trampoline court to building ratio?

Trampoline courts should on average occupy 45-50% of the total square footage of your building.