The average cost to build a shed or a playhouse in your backyard is about $3,500, with the low end of the range being around $200 and the high end being near $30,000. The final cost will depend on factors such as how big of a shed you want, whether or not you build it yourself or buy a premade shed, and the amenities that you include in your shed. Additional features such as carpeting, hardwood flooring, insulation, electricity, plumbing, or air conditioning can drastically drive up the price of your she shed project.