The most common way of funding a miniature golf course, according to MS Audrie Evans, manager of the "Golf Farm" (801 Haddonfield-Berlin Rd, Voorhees, New Jersey 08043-4393), is that of searching a specialized constructor, who builds the miniature golf course using a certain amount of money. The debt towards the constructor is extinguished year by year by paying
a percentage on the profits.

An alternative method could be that of applying for a bank loan, that is a sum of money lent at certain conditions, usually at interest, or finding a sponsor, which means someone who pays, or contributes towards, the cost of the course and its maintenance in return for commercial advertisement.
A miniature golf course could be supported by public funds, especially the Mill Creek one; some public supporters would be:

West Philadelphia Empowerment
Philadelphia Commercial Development Corporation
Philadelphia Planning Commission
Setpta

A sum of money could also be the subject of a formal grant in case of a private funding.