The cost to start an indoor playground can vary widely depending on a number of factors, including the size and complexity of the playground, location, equipment, labor costs, and other expenses. Generally, the cost to start an indoor playground can range from tens of thousands to hundreds of thousands of dollars.

Here are some potential expenses to consider when estimating the cost to start an indoor playground:
- Rent and Utilities: The cost of renting or leasing a suitable indoor space for the playground, along with the cost of utilities and other expenses related to running the facility.
- Equipment and Installation: The cost of purchasing and installing indoor playground equipment, such as play structures, slides, swings, climbing walls, and soft play areas. Depending on the size and complexity of the playground, this cost could range from a few thousand to tens of thousands of dollars.
- Safety Surfacing: The cost of safety surfacing, such as rubber matting or foam padding, to cushion falls and prevent injuries. This cost could range from a few thousand to tens of thousands of dollars.
- Labor Costs: The cost of hiring and training staff to operate the playground, including wages, benefits, and training expenses.
- Insurance and Legal Fees: The cost of obtaining liability insurance and legal services to protect the business and ensure compliance with regulations and safety standards.
- Marketing and Advertising: The cost of marketing and advertising the indoor playground to attract customers, such as online advertising, social media marketing, and print materials.
Overall, the cost to start an indoor playground can vary widely depending on a number of factors. It is important to carefully plan and budget for all expenses before starting the business, in order to ensure that it is financially viable and sustainable.