The average cost of selling a house without using a realtor can vary depending on a number of factors. Generally, selling a house without a realtor can save you money on the listing agent's fee, which is typically around 2.72% of the home's final sale price. However, many sellers forget about the buyer's agent commission, which averages around 2.65%. In addition to these commissions, there are also other costs to consider, such as closing costs, which can range from 2-3% of the sale price. Therefore, the total cost of selling a house without a realtor can be around 5-7% of the sale price. However, it's important to note that selling a house without a realtor can also require a significant amount of time and effort, and may result in a lower sale price for the home.