Selling Your Pittsburgh House? You Need to Know These 5 Hidden Costs! How much does it cost to sell a house? Probably more than you think. Many people look at comparable homes online and believe that if they get an offer for $300k, for example, that they’ll get a wire deposit for $300k at the end of the process. The reality is much different. If you’re looking at selling your Pittsburgh house through a real estate agent, you must prepare yourself mentally for many hidden costs.