School districts are required by state law to ask voters for permission to sell bonds to investors in order to raise the capital dollars required for projects such as renovation to existing buildings or building a new school. Through this, voters are giving permission for the district to take out a loan and pay that loan back over an extended period of time, much like a family takes out a mortgage loan for their home. A school board calls a bond election so voters can decide whether or not they want to pay for proposed facility projects.