However, homeowners should expect to pay anywhere from $14,961 to $21,649, which is the median range for this type of project. Spas, since they are substantially smaller in size, will cost less. Prices for spas typically range between $3,210 and $5,613 for outdoor installation. Costs of Heating A Swimming Pool If you plan to have a heated pool, you will need to install some kind of heating system.