Hi, The amount of clearance required is probably going to be up to your local inspector, as many seem to have their own guidelines. Our experience with insurance is that a number of standard insurers offer it, and it is relatively inexpensive, while there are also specialty carriers. This link includes a partial list of insurers some of our customers have reported using in the past. The most important safety precautions we can offer regarding indoor facilities are as follows: Ensure proper anchoring, typically using sand bags. Monitor users for safe play, per instructions and label requirements. Install appropriate impact-attenuating flooring/padding and cover any other hazards such as building columns. Keep inflatables away from hazards such as electrical boxes on the walls. Separate Blowers from users using child safety fencing, etc. Please feel free to contact us with additional questions. Sincerely, Blast Zone Support